How many moles of V are there in a sample that contains 2.34E+22 vanadium atoms?

How many atoms are in one mol? (It's a constant, independent of the type of atom)

Suppose that you added 35.0 g of water at 99.50 C to a calorimeter containing 150 g of water at 23.0 C and the temperature in the calorimeter rose to 35.60 C. What would be the heat capacity of the calorimeter