what volume of hydrogen at STP is produced by the reaction of 50.0g of Mg and the equivalent of 75g of HCL

your answer would be “dry”

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.

the correct answer would be b) volume versus temperature, because they are also directly proportional.