2 questions of Chem about mol

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What is the stoichiometric (molar) ratio of Br-ions to CaBr2?

1:3

4:2

1:2

2:1

 

How many moles of H2O are there in 7.15 grams of H2O?  For H2O, use the FW = 18.015 g/mol.

0.397

0.5071

0.397 x 1023

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