Can you me with these questions plz here u go

when kay added 30 g of hydrochloric acid (hcl) to 65 g of zn, bubbles appeared and a white precipitate, zinc chloride (zncl2) was produced. she found that the mass of the zinc chloride was 93 g. since the law of conservation of matter stated that matter can't be created or destroyed, she was puzzled about the difference in mass. what is the best explanation for the missing 2 g?

2h2o → 2h2 + o2

describe the mass of the reactants and products given the balanced chemical reaction.
a) the mass of the products is
2
3
that of the reactants.
b) the mass of the reactants equals the mass of the products.
c) the mass of the reactants is less than the mass of the products.
d) the mass of the reactants is greater than the mass of the products.

using the law of conservation of matter, determine the number of grams of iron sulfide (fes) that will be produced in this reaction.

112g fe + 64g s → g fes
a) 48 grams
b) 64 grams
c) 112 grams
d) 176 grams

which of the these is a balanced chemical equation?
a) co(g) + o2(g) → co2(g)
b) co(g) + 2o2(g) → 2co2(g)
c) 2co(g) + o2(g) → 2co2(g)
d) 2co(g) + 2o2(g)

according to the law of conservation of matter, we know that the total number of atoms does not change in a chemical reaction and thus mass is conserved. this is part of a chemical reaction: hydrogen plus oxygen yields water. can you complete this model? what should be added to the product side of the reaction?
a) a
b) b
eliminate
c) c
d) d→ 2co2(g)
eliminate

when kay added 30 g of hydrochloric acid (hcl) to 65 g of zn, bubbles appeared and a white precipitate, zinc chloride (zncl2) was produced. she found that the mass of the zinc chloride was 93 g. since the law of conservation of matter stated that matter can't be created or destroyed, she was puzzled about the difference in mass. what is the best explanation for the missing 2 g?
a) 2 g of zinc disappeared.
b) 2 g of hydrogen gas were produced.
c) kay didn't correctly mass the precipitate.
d) kay didn't collect all ofa flask with vinegar in it has a mass of 160 grams. a balloon with baking soda in it has a mass of 40 grams. the balloon is attached to the flask to seal the opening and the vinegar and baking soda mixes. the balloon inflates to a large volume. what will the total mass of the balloon and flask be after the balloon inflates? explain.
a) less than 200 grams because the solid baking soda disappears.
b) 200 grams, because all the atoms remain in the balloon or flask.
c) more than 200 grams because the size of the balloon is so much larger.
d) less than 200 grams because gases such as the one in the balloon are lighter than solids and liquids.
eliminate
ncorrect
the balanced equation is 2na + cl2 > 2nacl. none of the others have a balanced number of atoms on both sides of the equation.

na + cl2 > nacl

balance the chemical equation
a) na + cl2 > nacl
b) 2na + cl2 > nacl
c) 2na + cl2 > 2nacl
d) 2na + 2cl2 > 2nacl