Question

Heating will decompose silver oxide, Ag2O, to silver metal, Ag, plus oxygen gas, O2. How many moles of oxygen gas will form when 4.64 g of solid silver oxide is decomposed? The formula mass of silver oxide is 232 g/mol.

0.100 mol.

0.0200 mol.

0.0150 mol.

0.0100 mol.

Answer 1

The moles of oxygen gas that form when 4.64 g of solid silver oxide decomposes is calculated as below

calculate the moles of Silver oxide that decoposed

moles = mass/molar mass

= 4.64 g/232 g/mol = 0.02 moles

write the balanced reacting equation

2Ag2O =4 Ag + O2

from the equation above the reacting ratio between Ag2O to O2 is 2:1, therefore the moles of O2

= 0.02 x 1/2 = 0.01 moles of oxygen