Calculate the mass of nitrogen which contains same number of molecules as are present in 4.4g of CO₂.

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Solution

The molecular mass of carbon dioxide = 44 g
In 44g, number of molecules of carbon dioxide= 6.023 * 10²³
In 4.4g, number of molecules of carbon dioxide= 6.023 * 10²²
Molecular mass of nitrogen molecule= 28.
So, 6.023 * 10²³ molecules of nitrogen present in 28 g
Thus, 6.023 * 10²² molecules of nitrogen are present in (28/ 6.023 * 10²³ ) * 6.023 * 10²² = 2.8g

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