Question

show by calculation that 9 moles of carbon dioxide and 22 moles of H2O have the same mass in grams​

Answer 1

Explanation:

Calculating the Relative Molecular Mass of the two compounds:

Let's begin with Carbon Dioxide!

RMM of Carbon Dioxide = 12 + 16 * 2 = 44 g

Hence,

1 mole of carbon dioxide weighs 44 g

=> 9 moles of carbon dioxide weighs 44*9 i.e. 396 g

Next comes the calculation for water!

RMM of water = 1 * 2 + 16 = 18 g

Hence,

1 mole of water weighs 18 g

=> 22 moles of water weighs 18 *22 i.e. 396 g

Comparing the two masses:

396 g = 396 g

=> 9 moles of carbon dioxide = 22 moles of water

=> LHS = RHS

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