Which of the following is not an oxidation-reduction reaction? (pictured below)

Chemistry

1 answer:

Elanso [62]3 years ago

3 0

Answer is: the third reaction.
Elements in this chemical reaction do not change their oxidation number. Hydrogen has oxydation number +1, sulfur oxidation number is +6, oxygen has oxidation number -2 and barium has +2 on both sides of chemical reaction. In other reactions elements change their oxidation numbers.

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Gwar [14]

Answer:

Option D.

Explanation:

6H₂ + P₄ → 4PH₃

First we convert the given reactant masses into moles, using their respective molar masses:

4.00 g H₂ ÷ 2 g/mol = 2 mol H₂

6.20 g P₄ ÷ 124 g/mol = 0.05 mol P₄

0.05 moles of P₄ would react completely with (6*0.05) 0.3 moles of H₂. There are more H₂ moles than required, meaning H₂ is in excess and P₄ is the limiting reactant.

Now we calculate how many PH₃ moles could be formed, using the number of moles of the limiting reactant: