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  • Verify by calculating that (a) 5 moles of  CO_{2} and 5 moles of H_{2}O do not have the same mass. (b) 240 g of calcium and 240 g magnesium elements have a mole ratio of 3:5 .

Verify by calculating that
(a) 5 moles of CO_{{2}} and 5 moles of H_{2}O do not have the same mass.
(b) 240 g of calcium and 240 g magnesium elements have a mole ratio of 3:5.

Answers (1)

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Answer:

(a) CO_{2} has molar mass = 44g mol^{-1}
5 moles of CO_{2} have molar mass = 44 \times 5 = 220 g
H_{2}O has molar mass = 18 g mol^{-1}
5 moles of H_{2}O have mass = 18 \times 5 g = 90 g

Hence, they do not have same mass. 
(b) Number of moles in 240g Ca metal =\frac{240}{40} = 6
Number of moles in 240g of Mg metal =\frac{240}{24} = 10
Ratio 6:10 = 3: 5

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