Chemistry, 26.04.2020 13:03, jetblackcap

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1. What is the calculated empirical formula of the copper oxide if a 0.626 g sample of the copper oxide was reduced to 0.500 g of copper metal by heating in a stream of hydrogen gas?
2. If a sample of salt water has a measured concentration of 21.0 ppt, how many grams of salt are there in a 2.05 kg sample of this salt water?

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ASAP will give brainliest <3
1. What is the calculated empirical formula of the copper oxid...