What does the law of conservation of mass say?

a) the mass of the products in a chemical reaction is unrelated to the mass of the
reactants.

b) the mass of the reactants is greater than the mass of the products in a chemical
reaction.

c) the mass of the products in a chemical reaction is equal to the mass of the
reactants.

d) the mass of the reactants is less than the mass of the products in a chemical
reaction.

Answer asap need it by wednesday morning carry out the following calculations on ph and ka of from data. i. calculate the ph of 0.02m hcl ii. calculate the ph of 0.036m naoh iii. calculate the ph of 0.36m ca(oh)2 iv. calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 v. calculate ka for weak acid ha which has a ph of 3.65 at 0.30m concentration vi. calculate the ka of a solution made by mixing 15.0 cm3 0.2m ha and 60.0 cm3 0.31m a-. [ph= 3.80] vii. calculate the ph of a solution made by mixing 15.0 cm3 0.1m naoh and 35.0 cm3 0.2m hcooh. [ka = 1.82 x 10-4 m]