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How many molecules are in 7.2g H2O?

Updated: 8/9/2023
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11y ago

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Formula mass / Formula weight / Molecular mass / Molecular weight of H2O = (1*2) + 16 = 18g

1 mol of H2O = 18g H2O

1 mol of H2O = 6.023 * 10^23 molecules

In 18g H2O there are 6.023 * 10^23 molecules.

So,

In 1g H2O there are (6.023 * 10^23) / 18 molecules = 3.346 * 10^22 molecules

Therefore,

In 7.3g H2O there are (3.346 * 10^22) * 7.3 molecules = 2.443 * 10^23 molecules

Ans: 2.443 * 10^23 molecules

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11y ago
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11y ago

7.2 grams H2O (1 mole H2O/18.016 grams)(6.022 X 1023/1 mole H2O)

= 2.4 X 1023 molecules of water

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11y ago

237 grams CCl4 (1 mole CCl4/153.81 grams)(6.022 X 1023/1 mole CCl4)

= 9.28 X 1023 molecules of carbon tetrachloride

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11y ago

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Q: How many molecules are in 7.2g H2O?
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