If you burn 59.1 g of hydrogen and produce 528 g of water, how much oxygen is reacted

A 3 ml volume of a solution containing an unknown concentration of hcl is added to 7 ml of water. it is then determined that the concentration of the hcl in the diluted solution is 630 mm. what was the concentration of hcl in the original solution?

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If you burn 59.1 g of hydrogen and produce 528 g of water, how much oxygen is reacted