Determine the molecular weight of H2O.
189
18.0 g
18.019
18.016 9

18.01534

The last one

Explanation:

The molar mass of H20 is 15.9994+(2 x 1.00797) which equals 18.01534 grams/mole.

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.

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.