Calculate the volume

1. Calculate the volume occupied by 25.2 g of CO2 at 0.84 atm and 25C?
2. How much heat is required to raise the temperture of 1,500 g of water from 25C to 52C?The specific heat of water is 4.184 J/g * C.
3. Predict the geometry and polarity of the CO2 molecule
4. A cup of ice cream contains 6.0 g of protein, 36g of carbohydrate, and 8.0 g of fat. Approximately how many hours of walking would be required to burn up the energy taken in by eating a cup of ice cream? protein= 4 Kcal/g, carbohydrate = 4 Kcal/g, fat= 9 Kcal/g, walking burns 300 kcal/hr (Observe significant digits)