If you have 1000g of calcium, how can you determine the number of moles of calcium you have? Show your steps and explain how you use the periodic table in your process.

Why is the vapor pressure of a warm lake higher than the vapor pressure of a cold lake? o a. warm water has a greater heat of vaporization. ob. warm water evaporates more quickly. cool water evaporates more quickly. od. cool water has a greater heat of vaporization.

In france, grapes are 1.95 euros per kilogram. what is the cost of grapes, in dollars per pound, if the exchange rate is 1.14 dollars/euro? (2.6)

Can someone me with 3 and 4 plz. this is for masteries test.