Question

1) When 5.00g of copper reacts with oxygen, thecopper oxide product has a mass of 5.62g. What is the empiricalformula of this copper oxide? MM Cu= 63.5, O= 16.0

2) What is the molarity of acetic acid, CH3COOH(MM= 60.0) in vinegar if a 5.00mL sample of vinegar requires22.50mL of a 0.195M NaOH solution to neutralize it?

3) A 20.00mL sample of NaCl solution has a massof 20.75g. After the NaCl solution is evaporated to dryness the drysalt has a mass of 4.35g. Calculate the following concentration forthe NaCl solution, MM NaCl= 58.5

(a) % m/m (or % w/w)

(b) % m/v

(c) Moraity (M)