Sodium hydrogen carbonate is heated to produce carbon dioxide and sodium hydroxide.

relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold.

so d

the answer is d. 74.02

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.