Consider the reaction below involving the combustion of hydrogen gas: 2H2(g) + O2(g) → 2H2O(g)
What will be the volume of water vapor produced when 8 grams of H2 reacts
at STP?
O About 22 liters
O About 44 liters
O About 66 liters
About 88 liters

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).

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.

c. 4.54 x 10–12 j happens to be correct