In the chemical reaction below, calcium (ca) and water (h2o) react to form calcium hydroxide (ca(oh)2) and hydrogen gas (h2).
ca (s) + 2h2o (l) → ca(oh)2 (aq) + h2 (g)

calcium and water are the reactants in this chemical reaction, whereas calcium hydroxide and hydrogen gas are the products that are formed. once the reaction reaches completion,
a.
the total mass of the products will be greater than the original mass of the reactants.
b.
the total mass of the products will be less than the original mass of the reactants.
c.
the products of the reaction will have changed back into the reactants.
d.
the total mass of the products will be equal to the original mass of the reactants.
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D. the total mass of the products will be equal to the original mass of the reactants

it is the answer d. the total mass of the products will be equal to the original mass of the reactants

Explanation:

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c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.