NO3+Cl2ClO3+NO2 (8 maris) 2. Calculate the number of atoms in 136g of C3H5NO2. [RAM: C=12,H=1,N=14,O=16 ] (2 marks) 3. Calculate the molar volume of 32g of CBr2F2 at STP. [RAM: C=12,Br=80,F=19] (2 marks) 4. A sample of O2 gas has a volume of 1.5dm3. Calculate the mass of O2 at RTP. [RAM: O=16 ] (2 marks) 5. Calculate the percent composition for Zn,C and O in ZnCO. [RAM: Zn=65,C=12,O=16] (3 mar's) 6. The composition of an organic compound is reported to have 53.4% carbon, 11.2% hydrogen and 35.5% oxygen by mass. a) Find the empirical formula of this organic compound. b) Find the molecular formula if the molecular weight is 45g/mol. (2 marks) (CLO2.PLO6:C3) 7. Refer to the checmical equation below. Given 50g Magnesium, and 50g oxygen gas. [RAM:Mg=24,O=16] 2Mg+O22MgO a) Determine limiting reactant. b) Calculate the mass of excess (balance) left