How many moles are in 9.8 grams of calcium?

1 Answer
zhirou
Feb 20, 2018

#0.24# moles.

Explanation:

First, we need to know how many grams are in #1# mole of calcium. We can find this by looking at the periodic table:
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The number on the bottom tells us that the mass of #1# mole of calcium is #"40.08g"#. To find the number of moles in #"9.8g"# of calcium, we'll just divide #40.08# by #9.8#:

#"number of moles" = "mass of sample" / "mass of 1 mole"#
#"9.8g"/"40.08g"=0.2445# moles

The question had #2# significant figures, so our answer should also be rounded to #2# significant figures—#0.24# moles.

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