Question

what is the molar ratio between h₂ and o₂ in the balanced chemical equation below?
2h₂(g) + o₂(g) ⟶ 2h₂o(g)
2:2
2:1
1:2
1:1
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18 multiple choice 1 point
what is the molar ratio?
the ratio between the subscripts of compounds involved in the chemical reaction
the ratio between the coefficients of compounds involved in the chemical reaction
the ratio of moles of products
the ratio of moles of reactants
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Explanation:

First Question (Molar Ratio between $\boldsymbol{H_2}$ and $\boldsymbol{O_2}$)

Step1: Identify coefficients

In the equation $2H_2(g) + O_2(g)
ightarrow 2H_2O(g)$, the coefficient of $H_2$ is 2, and the coefficient of $O_2$ is 1.

Step2: Determine molar ratio

Molar ratio of $H_2$ to $O_2$ is coefficient of $H_2$ : coefficient of $O_2$ = $2:1$.

Molar ratio is defined by the coefficients of compounds in a balanced chemical equation. Subscripts relate to atoms in a compound, not molar ratios. It can involve reactants and products, not just one. So the correct definition is the ratio between the coefficients of compounds in the reaction.

Answer:

2:1

Second Question (Definition of Molar Ratio)