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hydrogen chloride = H+1, Cl-1 = HCl

H = 1.008

Cl = 35.453

HCl = 36.458 g/mol

21.1 g x 1 mol HCl/36.458g = .579 mol HCl

The ions of hydrogen chloride balance out so the formula is HCl. You add the atomic weights of the individual elements to get a grams/mole for the molecule HCl. You take the information that was given, 21.1g of HCl, and multiply it by the fact that 1 mole of HCl is 36.458g. Grams cross out and you're left with 21.1 x 1 mol / 36.458 = .579 mol. This is how many moles are in 21.1g of HCl.

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12y ago
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12y ago

The molar mass of hydrogen chloride is approximately 36 g (use a Periodic Table for more precise masses). This means that one mole of hydrogen chloride has that mass. To answer your question, you can set up a proportion, or divide 21.2 g by 36 g.

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13y ago

21.99 grams H2O (1mol H2O/18.016 grams)

= 1.221 moles H2O

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11y ago

I don't know. Try asking someone else.

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12y ago

21.0 mol

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Q: How many moles are present in 21.2 g hydrogen chloride?
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