You are preparing methyl benzoate, which will be used as one of the reactants in the next lab for the synthesis of a tertiary alcohol via a Grignard reaction. Look at the Grignard procedure and compare the amount of methyl benzoate you will need vs the theoretical yield you have calculated above. How much will you need?

a corroding iron, if that's one of your choices

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.