Small samples of oxygen gas needed in the laboratory can be generated by any number of simple chemical reactions,such as 2 KCl $\mathrm { O } _ { 3 }$ (s)? 2 KCl (s)+ 3 $\mathrm { O } _ { 2 }$ (g)
What mass of oxygen (in grams)is produced when 122.6 g of KCl $\mathrm { O } _ { 3 }$ (formula mass = 122.6 amu)takes part in this reaction?
A)32.00 grams
B)48.00 grams
C)96.00 grams
D)More information is needed.

Question

Quizplus · Accepted Answer

The molar mass of KClO3 is 122.6 g/mol. Since 122.6 g of KClO3 is used, it corresponds to 1 mole. According to the balanced equation, 2 moles of KClO3 produce 3 moles of O2. Therefore, 1 mole of KClO3 produces 1.5 moles of O2. The molar mass of O2 is 32.00 g/mol, so 1.5 moles of O2 is 1.5 * 32.00 = 48.00 grams.

Small Samples of Oxygen Gas Needed in the Laboratory Can O3\mathrm { O } _ { 3 }O3​

Small Samples of Oxygen Gas Needed in the Laboratory Can $\mathrm { O } _ { 3 }$