An alloy used in aircraft structures contains 93.7% Al and 6.3% Cu by mass. Density of the alloy 2.85 g / cm3 'kind. 0,691 cm3 A piece of alloy reacts with an excess of HCl (in water). All Al reacts with HCl (in water) but none of Cu with HCl (in water) Assuming it does not react, what is the mass of H2 obtained?

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Units and Dimensions

Dimensions are the basic concepts of the measurement of quantities. Units are the means of expressing the dimensions. For instance, an area has a dimension of L2 and a unit of m2.