Help with a few chem questions

Can someone answer these for me? =)

1) Molarity is:
A) the number of moles of a substance in a sample
B) the concentration of a solution in grams per litre
C) the concentration of a solution in moles per litre
D) the number of grams in one mole of a substance

2) Calculate the concentration of a solution in g per 100 ml that contains 13.0 g in 325 ml of solution.
A) 0.04 g/100 ml
B) 0.40 g/100 ml
C) 4.0 g/100 ml
D) 40.0 g/100 ml

3) What is the concentration, in % volume, of a solution that contains 60 ml of hydrogen peroxide in 1 L of solution?
A) 60 % V/V
B) 6.0 % V/V
C) 0.6 % V/V
D) 0.06 % V/V

4) The following is the equation for the electrolysis of water:
2H2O -> 2H2 + O2
The number of moles of H2, produced by the electrolysis of 4 moles of water is:
A) 1 mol
B) 2 mol
C) 4 mol
D) 8 mol

5) How many moles of Cu are needed to react with 4 mol of AgNO3 based on the following equation?
Cu + 2AgNO3 -> Cu(NO3)2 +2Ag
A) 1mol
B) 2 mol
C) 8 mol
D) 4 mol

Thank you! =)

1) C
2) C
3) D
4) C
5) B

1. molarity is the concentration in g/L

2. calculate the grams in solution 2 (g2) using the equation g1/mL1 = g2/mL2

3. convert 60mL into L and divide by 1 L

4. the equation tells us that 2 moles of water is required to make 2 moles of H2

5. the equation tells us that 2 mol of AgNO3 is required to react with 1 mol of Cu