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Question

Mass of 4.82 x 1025 molecules of H2O is approximately ____.

A
1440 g
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B
1280 g
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C
160 g
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D
1600 g
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Solution

The correct option is A 1440 g

Given that, there are 4.82×1025 molecules of water.

Number of moles of water =Total number of moleculesAvogadro constant=4.82×10256.022×1023=80.04

Therefore, mass of water = Number of moles×Molar Mass
=80.04×18=1440.72 g


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