Question

how much quantity of co2 reaches atmosphere when 1 kg methane is burnt?​

Answer 1

when methane is burnt in the presence of Oxygen, it gives carbon dioxide and water. reaction of methane with oxygen is ...

$CH_4+2O_2\rightarrow CO_2+2H_2O$

from reaction, it is clear that one mole of methane forms 1 mole of carbon dioxide.

we know, molar mass of methane = 16g/mol

and molar mass of carbon dioxide = 44g/mol

or, 16g of methane produces 44g of carbon dioxide.

or, 1kg of methane produces 44/16 × 1 kg = 2.75 Kg, of carbon dioxide.

hence, amount of CO2 reaches atmosphere when 1kg methane is burnt = 2.75kg

Answer 2

2.75 kg of carbon dioxide $(CO_2)$  reaches atmosphere when 1 kg methane is burnt

Explanation:

The balanced chemical equation for combustion of methane is:

$CH_4+2O_2 \rightarrow CO_2+2H_2O$

To calculate the moles, we use the equation:

$\text{Number of moles of methane}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{1000g}{16g/mol}=62.5moles$       (1kg=1000g)

1 mole of methane $(CH_4)$ releases = 1 mole of carbon dioxide $(CO_2)$

62.5 moles of methane $(CH_4)$ release = $\frac{1}{1}\times 62.5=62.5$ mole of  of carbon dioxide $(CO_2)$

Mass of carbon dioxide $(CO_2)=moles\times {\text {Molar Mass}}=62.5mol\times 44g/mol=2750g=2.75kg$    

Learn more about combustion of methane

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