just the choice

Q17- At which of the following extemal pressures will benzene has its lowest boiling point? A) 760mmHg B) 755mmHg C) 785mmHg D) 792mmHg Q11- 48g of silver nitrate (AgNO3)(Mm=170g/mol) was react with 32g of sodium chloride (NaCl)(Mm= 58.4g/mol ) according to the equation below, if the mass of solid collect =17.8g then the % of the precipitate is (MmNaNO3=85/AgCl=143.3g/mol) : A) 74.8% B) 22.6% C) 44.4% D) 56.5%