How many molecules are contained in 0.500 moles of hydrogen gas?

A.

1.20 x 1024 molecules

B.

6.02 x 10-23 molecules

C.

3.01 x 10-23 molecules

D.

3.01 x 1023 molecules

How many liters of ethylene glycol antifreeze (c2h6o2), with a density of 1.100 g/l, would you add to your car radiator containing 15.0 kg of water if you needed to protect your engine to - 21.5°c? for water, kf = 1.86°c m -1.