Question 1

How many moles of BCl₃ are needed to produce 5.00 g of HCl(aq)in the following reaction? BCl₃(g)+ 3 H₂O(l)→ 3 HCl(aq)+ B(OH)₃(aq)

Accepted Answer

The molar mass of HCl is approximately 36.46 g/mol. To find the moles of HCl, divide 5.00 g by 36.46 g/mol, which gives approximately 0.137 mol of HCl. According to the balanced equation, 1 mole of BCl3 produces 3 moles of HCl. Therefore, 0.137 mol of HCl requires 0.137/3 = 0.0457 mol of BCl3.

Question 2

According to the following balanced reaction,how many moles of KO are required to exactly react with 4.33 moles of H₂O? 4 KO(s)+ 2 H₂O(l)→ 4 KOH(s)+ O₂(g)

Accepted Answer

According to the balanced chemical equation, 4 moles of KO reacts with 2 moles of H₂O. Therefore, 1 mole of KO reacts with 0.5 moles of H₂O. To react with 4.33 moles of H₂O, we need: 4.33 mol H₂O × 1 mol KO/0.5 mol H₂O = 8.66 mol KO Therefore, the answer is B.

Question 3

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements:  (s)→ 2Na(s)+  (g) How many moles of  are produced by the decomposition of 1.25 mol of sodium azide?

Accepted Answer

From the balanced equation, we can see that 2 moles of Na are produced for every 11 moles of N2.
So, moles of N2 produced = (11/2) * moles of Na produced
Given that 1.25 mol of sodium azide decomposes, which is equivalent to the production of 2*1.25 = 2.5 mol of Na.
Therefore, moles of N2 produced = (11/2) * 2.5 = 13.75/2 = 6.875
Rounding off to three significant figures we get 6.88.
Therefore, the answer is C) 1.88.

Question 4

Dinitrogen monoxide gas decomposes to form nitrogen gas and oxygen gas.How many grams of oxygen are formed when 20.0 g of dinitrogen monoxide decomposes?

Accepted Answer

The balanced chemical equation for the decomposition of dinitrogen monoxide is:
N2O → N2 + O2
The molar mass of N2O is 44.02 g/mol. We can use this to convert the given mass of N2O to moles:
20.0 g N2O × (1 mol / 44.02 g) = 0.454 mol N2O
According to the balanced equation, 1 mole of N2O yields 1 mole of O2. Therefore, 0.454 mol N2O yields 0.454 mol O2.
Finally, we can convert moles of O2 to grams using the molar mass of O2:
0.454 mol O2 × (32.00 g / mol) = 14.5 g O2
Therefore, the answer is choice B.

Question 5

Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 12.4 g of carbonic acid? H₂CO₃ → H₂O + CO₂

Accepted Answer

12.4 g of carbonic acid (H2CO3) contains 1 mole of H2CO3. According to the balanced chemical equation, 1 mole of H2CO3 produces 1 mole of CO2. The molar mass of CO2 is 44.01 g/mol. Therefore, 1 mole of CO2 weighs 44.01 g. So, 12.4 g of H2CO3 will produce 44.01 g of CO2.

Question 6

How many molecules of HCl are formed when 90.0 g of water reacts according to the following balanced reaction? Assume excess ICl₃. 2 ICl₃ + 3 H₂O → ICl + HIO₃ + 5 HCl

Accepted Answer

The molar mass of water (H₂O) is 18.0 g/mol. Therefore, 90.0 g of water is 5.00 moles. According to the balanced equation, 3 moles of water produce 5 moles of HCl. Thus, 5.00 moles of water will produce (5/3) * 5.00 = 8.33 moles of HCl. Since 1 mole of any substance contains 6.022 × 10²³ molecules, 8.33 moles of HCl will contain 8.33 × 6.022 × 10²³ = 5.00 × 10²⁴ molecules of HCl.

Question 7

Balance the chemical equation given below,and determine the number of grams of MgO are needed to produce 15.0 g of Fe₂O₃. ________ MgO(s)+ ________ Fe(s)→ ________ Fe₂O₃(s)+ ________ Mg(s)

Accepted Answer

The answer of Balance the chemical equation given below,and determine...

Question 8

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg(s)+  (g)→ 2MgO(s)
How many moles of  are consumed when 1.90 mol of magnesium burns?

Accepted Answer

From the balanced equation, we can see that 11/2 moles of 11ea6923_17df_b4cb_80d0_d13a92d21c91_TB6105_11 are required for every 2 moles of Mg consumed. Therefore, the number of moles of 11ea6923_17df_b4cb_80d0_d13a92d21c91_TB6105_11 consumed is (11/2) x 1.90/2 = 0.950. The answer is E.

Question 9

How many grams of oxygen are formed when 5.30 moles of KOH are formed? 4 KO(s)+ 2 H₂O(l)→ 4 KOH(s)+ O₂(g)

Accepted Answer

According to the balanced chemical equation,
4 moles of KOH form 1 mole of O2
Therefore, 5.30 moles of KOH will form
= (5.30/4) moles of O2
= 1.325 moles of O2
Now, using the molar mass of oxygen,
1 mole of O2 = 32 g
Therefore, 1.325 moles of O2 will weigh
= 1.325 × 32 g
= 42.4 g
Hence, the answer is option C.

Question 10

Lithium and nitrogen react to produce lithium nitride: 6Li(s)+  (g)→  N(s)
How many moles of  are needed to react with 0.450 mol of lithium?

Accepted Answer

The answer of Lithium and nitrogen react to produce lithium...

Question 11

According to the following balanced reaction,how many moles of NO are formed from 8.44 moles of NO₂if there is plenty of water present? 3 NO₂(g)+ H₂O(l)→ 2 HNO₃(aq)+ NO(g)

Accepted Answer

The answer of According to the following balanced reaction,how many...

Question 12

Lithium and nitrogen react to produce lithium nitride: 6Li(s)+  (g)→  N(s)
How many moles of lithium nitride are produced when 0.550 mol of lithium react in this fashion?

Accepted Answer

The answer of Lithium and nitrogen react to produce lithium...

Question 13

If the density of ethanol,C₂H₅OH,is 0.789 g/mL.How many milliliters of ethanol are needed to produce 20.0 g of CO₂ according to the following chemical equation? C₂H₅OH(l)+ 3 O₂(g)→ 2 CO₂(g)+ 3 H₂O(l)

Accepted Answer

From the balanced chemical equation, we can see that 1 mol of C₂H reacts with 3 mol of O2 to produce 2 mol of CO₂ and 3 mol of H₂O. First, we need to calculate the number of moles of C₂H that would react with 20.0 g of CO₂: molar mass of CO₂ = 12.01 + 32.07 + 16.00 = 60.08 g/mol moles of CO₂ = 20.0 g / 60.08 g/mol = 0.333 mol Since 1 mol of C₂H reacts with 2/3 mol of CO₂, we need: moles of C₂H = 0.333 mol x (1 mol C₂H / (2/3 mol CO₂)) = 0.5 mol Now we can use the density of ethanol to find the volume needed to obtain 0.5 mol: mass of ethanol needed = 0.5 mol x 46.07 g/mol (molar mass of C₂H) = 23.04 g volume of ethanol needed = 23.04 g / 0.789 g/mL = 29.2 mL Rounding to two significant figures, the answer is 13.3 mL.

Question 14

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements:  (s)→ 2Na(s)+  (g) How many grams of sodium azide are required to produce 25.0 g of nitrogen?

Accepted Answer

The answer of Automotive air bags inflate when sodium azide...

Question 15

Consider the following reaction.How many moles of oxygen are required to produce 4.00 moles of water? Assume that there is excess C₃H₇SH present. C₃H₇SH(l)+ 6 O₂(g)→ 3 CO₂(g)+ SO₂(g)+ 4 H₂O(g)

Accepted Answer

From the balanced equation, we can see that 6 moles of oxygen are required to produce 4 moles of water. Therefore, to produce 4 moles of water, we would need:

6 mol O2/4 mol H2O = 1.5 mol O2

However, the answer choices are given in whole number of moles of oxygen. To convert 1.5 mol to a whole number, we can multiply by 2:

1.5 mol * 2 = 3 mol

Therefore, the best choice is B) 6.00 moles O2, since this is the closest whole number multiple of 3.

Question 16

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li(s)+  (g)→  N(s)
How many moles of lithium are needed to produce 0.45 mol of  N when the reaction is carried out in the presence of excess nitrogen?

Accepted Answer

The answer of Lithium and nitrogen react in a combination...

Question 17

Strontium phosphate reacts with sulfuric acid to form strontium sulfate and phosphoric acid.What is the coefficient for sulfuric acid when the equation is balanced using the lowest,whole-numbered coefficients?

Accepted Answer

The answer of Strontium phosphate reacts with sulfuric acid to...

Question 18

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 20.0 g of aluminum. ________ Al(s)+ ________ I₂(s)→ ________ Al₂I₆(s)

Accepted Answer

The answer of Balance the chemical equation given below,and determine...

Question 19

How many moles of CuO can be produced from 2.25 mol of Cu₂O in the following reaction? 2 Cu₂O(s)+ O₂(g)→ 4 CuO(s)

Accepted Answer

According to the balanced equation, 2 moles of Cu₂O produces 4 moles of CuO. Therefore, 1 mole of Cu₂O would produce 4/2 = 2 moles of CuO. Thus, 2.25 mol of Cu₂O would produce 2.25 x 2 = 4.50 mol of CuO. Therefore, the best choice is C).

Question 20

How many grams of calcium chloride are needed to produce 5.00 g of potassium chloride? CaCl₂(aq)+ K₂CO₃(aq)→ 2 KCl(aq)+ CaCO₃(aq)

Accepted Answer

The balanced chemical equation gives a 1:1 ratio between calcium chloride and potassium chloride. Therefore, the amount of calcium chloride needed will be equal to the amount of potassium chloride produced. Thus, the answer is 5.00 g.

Quiz 8: Chemical Reactions and Chemical Quantities

How many moles of BCl₃ are needed to produce 5.00 g of HCl(aq) in the following reaction? BCl₃(g) + 3 H₂O(l) → 3 HCl(aq) + B(OH) ₃(aq)

According to the following balanced reaction,how many moles of KO are required to exactly react with 4.33 moles of H₂O? 4 KO(s) + 2 H₂O(l) → 4 KOH(s) + O₂(g)

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: (s) → 2Na(s) + (g) How many moles of are produced by the decomposition of 1.25 mol of sodium azide?

Dinitrogen monoxide gas decomposes to form nitrogen gas and oxygen gas.How many grams of oxygen are formed when 20.0 g of dinitrogen monoxide decomposes?

Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 12.4 g of carbonic acid? H₂CO₃ → H₂O + CO₂

How many molecules of HCl are formed when 90.0 g of water reacts according to the following balanced reaction? Assume excess ICl₃. 2 ICl₃ + 3 H₂O → ICl + HIO₃ + 5 HCl

Balance the chemical equation given below,and determine the number of grams of MgO are needed to produce 15.0 g of Fe₂O₃. MgO(s) + Fe(s) → Fe₂O₃(s) + Mg(s)

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg(s) + (g) → 2MgO(s) How many moles of are consumed when 1.90 mol of magnesium burns?

How many grams of oxygen are formed when 5.30 moles of KOH are formed? 4 KO(s) + 2 H₂O(l) → 4 KOH(s) + O₂(g)

Lithium and nitrogen react to produce lithium nitride: 6Li(s) + (g) → N(s) How many moles of are needed to react with 0.450 mol of lithium?

According to the following balanced reaction,how many moles of NO are formed from 8.44 moles of NO₂if there is plenty of water present? 3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g)

Lithium and nitrogen react to produce lithium nitride: 6Li(s) + (g) → N(s) How many moles of lithium nitride are produced when 0.550 mol of lithium react in this fashion?

If the density of ethanol,C₂H₅OH,is 0.789 g/mL.How many milliliters of ethanol are needed to produce 20.0 g of CO₂ according to the following chemical equation? C₂H₅OH(l) + 3 O₂(g) → 2 CO₂(g) + 3 H₂O(l)

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: (s) → 2Na(s) + (g) How many grams of sodium azide are required to produce 25.0 g of nitrogen?

Consider the following reaction.How many moles of oxygen are required to produce 4.00 moles of water? Assume that there is excess C₃H₇SH present. C₃H₇SH(l) + 6 O₂(g) → 3 CO₂(g) + SO₂(g) + 4 H₂O(g)

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li(s) + (g) → N(s) How many moles of lithium are needed to produce 0.45 mol of N when the reaction is carried out in the presence of excess nitrogen?

Strontium phosphate reacts with sulfuric acid to form strontium sulfate and phosphoric acid.What is the coefficient for sulfuric acid when the equation is balanced using the lowest,whole-numbered coefficients?

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 20.0 g of aluminum. Al(s) + I₂(s) → Al₂I₆(s)

How many moles of CuO can be produced from 2.25 mol of Cu₂O in the following reaction? 2 Cu₂O(s) + O₂(g) → 4 CuO(s)

How many grams of calcium chloride are needed to produce 5.00 g of potassium chloride? CaCl₂(aq) + K₂CO₃(aq) → 2 KCl(aq) + CaCO₃(aq)

Quiz 8: Chemical Reactions and Chemical Quantities

How many moles of BCl3 are needed to produce 5.00 g of HCl(aq) in the following reaction? BCl3(g) + 3 H2O(l) → 3 HCl(aq) + B(OH) 3(aq)

According to the following balanced reaction,how many moles of KO are required to exactly react with 4.33 moles of H2O? 4 KO(s) + 2 H2O(l) → 4 KOH(s) + O2(g)

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: (s) → 2Na(s) + (g) How many moles of are produced by the decomposition of 1.25 mol of sodium azide?

Dinitrogen monoxide gas decomposes to form nitrogen gas and oxygen gas.How many grams of oxygen are formed when 20.0 g of dinitrogen monoxide decomposes?

Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 12.4 g of carbonic acid? H2CO3 → H2O + CO2

How many molecules of HCl are formed when 90.0 g of water reacts according to the following balanced reaction? Assume excess ICl3. 2 ICl3 + 3 H2O → ICl + HIO3 + 5 HCl

Balance the chemical equation given below,and determine the number of grams of MgO are needed to produce 15.0 g of Fe2O3. ________ MgO(s) + ________ Fe(s) → ________ Fe2O3(s) + ________ Mg(s)

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg(s) + (g) → 2MgO(s) How many moles of are consumed when 1.90 mol of magnesium burns?

How many grams of oxygen are formed when 5.30 moles of KOH are formed? 4 KO(s) + 2 H2O(l) → 4 KOH(s) + O2(g)

Lithium and nitrogen react to produce lithium nitride: 6Li(s) + (g) → N(s) How many moles of are needed to react with 0.450 mol of lithium?

According to the following balanced reaction,how many moles of NO are formed from 8.44 moles of NO2 if there is plenty of water present? 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)

Lithium and nitrogen react to produce lithium nitride: 6Li(s) + (g) → N(s) How many moles of lithium nitride are produced when 0.550 mol of lithium react in this fashion?

If the density of ethanol,C2H5OH,is 0.789 g/mL.How many milliliters of ethanol are needed to produce 20.0 g of CO2 according to the following chemical equation? C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(l)

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: (s) → 2Na(s) + (g) How many grams of sodium azide are required to produce 25.0 g of nitrogen?

Consider the following reaction.How many moles of oxygen are required to produce 4.00 moles of water? Assume that there is excess C3H7SH present. C3H7SH(l) + 6 O2(g) → 3 CO2(g) + SO2(g) + 4 H2O(g)

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li(s) + (g) → N(s) How many moles of lithium are needed to produce 0.45 mol of N when the reaction is carried out in the presence of excess nitrogen?

Strontium phosphate reacts with sulfuric acid to form strontium sulfate and phosphoric acid.What is the coefficient for sulfuric acid when the equation is balanced using the lowest,whole-numbered coefficients?

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 20.0 g of aluminum. ________ Al(s) + ________ I2(s) → ________ Al2I6(s)

How many moles of CuO can be produced from 2.25 mol of Cu2O in the following reaction? 2 Cu2O(s) + O2(g) → 4 CuO(s)

How many grams of calcium chloride are needed to produce 5.00 g of potassium chloride? CaCl2(aq) + K2CO3(aq) → 2 KCl(aq) + CaCO3(aq)

How many moles of BCl₃ are needed to produce 5.00 g of HCl(aq) in the following reaction? BCl₃(g) + 3 H₂O(l) → 3 HCl(aq) + B(OH) ₃(aq)

According to the following balanced reaction,how many moles of KO are required to exactly react with 4.33 moles of H₂O? 4 KO(s) + 2 H₂O(l) → 4 KOH(s) + O₂(g)

Carbonic acid can form water and carbon dioxide upon heating.How much carbon dioxide is formed from 12.4 g of carbonic acid? H₂CO₃ → H₂O + CO₂

How many molecules of HCl are formed when 90.0 g of water reacts according to the following balanced reaction? Assume excess ICl₃. 2 ICl₃ + 3 H₂O → ICl + HIO₃ + 5 HCl

Balance the chemical equation given below,and determine the number of grams of MgO are needed to produce 15.0 g of Fe₂O₃. MgO(s) + Fe(s) → Fe₂O₃(s) + Mg(s)

How many grams of oxygen are formed when 5.30 moles of KOH are formed? 4 KO(s) + 2 H₂O(l) → 4 KOH(s) + O₂(g)

According to the following balanced reaction,how many moles of NO are formed from 8.44 moles of NO₂if there is plenty of water present? 3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g)

If the density of ethanol,C₂H₅OH,is 0.789 g/mL.How many milliliters of ethanol are needed to produce 20.0 g of CO₂ according to the following chemical equation? C₂H₅OH(l) + 3 O₂(g) → 2 CO₂(g) + 3 H₂O(l)

Consider the following reaction.How many moles of oxygen are required to produce 4.00 moles of water? Assume that there is excess C₃H₇SH present. C₃H₇SH(l) + 6 O₂(g) → 3 CO₂(g) + SO₂(g) + 4 H₂O(g)

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 20.0 g of aluminum. Al(s) + I₂(s) → Al₂I₆(s)

How many moles of CuO can be produced from 2.25 mol of Cu₂O in the following reaction? 2 Cu₂O(s) + O₂(g) → 4 CuO(s)

How many grams of calcium chloride are needed to produce 5.00 g of potassium chloride? CaCl₂(aq) + K₂CO₃(aq) → 2 KCl(aq) + CaCO₃(aq)