Calculate the number of moles in 75 g of O₂, and the volume that it would occupy at STP. A)2.3 mol, 52 L B)2.3 mol, 0.10 L C)2.4 x 10³ mol, 107 L D)2.4 x 10³ mol, 5.4 x 10⁴ L E)4.7 mol, 52 L

Question

Quizplus · Accepted Answer

We need to first find the molar mass of O₂. O=16, S=32, U=238.03, and B=10.81. So, molar mass = 16 + 238.03 + 32 + 10.81 + 12(10.81) = 1631.06 g/mol. Using the formula n=m/M, where n is the number of moles, m is the mass in grams, and M is the molar mass in g/mol, we can find the number of moles as n=75/1631.06 = 0.0459 mol. At STP, one mole of any gas occupies 22.4 L. Therefore, 0.0459 mol of O₂ will occupy 0.0459 x 22.4 = 1.03 L. However, the options have not used 22.4 L/mole, but given the answer directly in liters, so we need to convert 1.03 L to cubic meters (m^3) by dividing it by 1000. This gives us 1.03/1000 = 0.00103 m^3 = 1030 mL. Now, we can see that the only option that matches these values is A.

Calculate the Number of Moles in 75 G of O2

Calculate the Number of Moles in 75 G of O₂