Empirical & molecular formula questions

1. A 10.000 g sample of an oxide of copper was found to contain 8.882 g of copper. Determine the empirical formula of the copper oxide.2. A salt was found to contain 11.33 % carbon, 43.38 % sodium and 45.29 % oxygen by mass. Determine the empirical formula of the salt.3. A hydrocarbon contains 92.24 % carbon by mass and has a molar mass of 78.12 g mol-1. Determine the empirical formula and molecular formula...

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