A piece of magnesium ribbon is massed and placed into a sealed flask containing dilute HCl as shown above. Once the reaction is complete, the tube is adjusted to that the water in the tube
is level with the water in the trough and the volume of gas is recorded as 25.50 ml. The
atmospheric pressure in the room is recorded as 765.5 mmHg at a temperature of 23°C. The
vapor pressure of water at 23°C is 21.1 mmHg

with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence

lol for the pointsss

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.