Question

How much carbondioxide is released when 12 g of carbon burnt with 16 g of oxygen ?
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Answer 1

Mass of CO2, 44 g

Explanation:

From the concept of stoichiometry, we can calculate the amount from a balanced chemical equation.

C   +   O2  ↔  CO2

12g     16g         x

We need to convert the mass to moles first.

Moles of carbon = 12/12 = 1 mole

Moles of oxygen = 16/32 = 0.5 mole

As we know 1 mole of carbon produces 1 mole of CO2, Thus,

Moles of C = 1

Mass of CO2 = moles * molar mass = 1 * 44 = 44 g