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1. The 69.5-g sample of the compound X3O4 contains 19.2 g of oxygen atoms. What is...

1. The 69.5-g sample of the compound X3O4 contains 19.2 g of oxygen atoms. What is the molar mass of element X?

? g/mol

2. Calculate the percent composition by mass of each element in NaClO4?

% Na = ? %

% Cl = ? %

% O = ? %

3. How many grams of Br are in 505 g of CaBr2?

? g

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