Question

a) Convert 12g of O2 gas into moles.​

Answer 1

Answer:

12 g od O2 = 0.38 moles of O2

Explanation:

Molar Mass of O2 = 2 × 16 = 32.

Number of moles = (Given mass) ÷ Molar Mass

= 12 ÷ 32 = 0.375 moles

which is approximately equal to 0.38 moles

( to make the significant figure equal

Since the divisor and dividend has 2 significant figures, the answer should only contain 2 significant figures )