Question

choose the best answer using the equation. \\( 2c_4h_{10}(g) + 13o_2(g) \
ightarrow 8co_2(g) + 10h_2o(g) \\) \

1. choose all that apply. \

what are the two reactants? \
\\( \square c_4h_{10}(g) \\) \
\\( \square h_2o(g) \\) \
\\( \square o_2(g) \\) \
\\( \square co_2(g) \\) \

1. choose the best answer. \

what is the coefficient of \\( o_2 \\)? \
\\( \bigcirc 13 \\) \
\\( \bigcirc 10 \\) \
\\( \bigcirc 2 \\) \
\\( \bigcirc 8 \\) \

1. choose the best answer. \

what phase of matter are all the compounds in for this reaction? \
\\( \bigcirc \\) gas \
\\( \bigcirc \\) liquid \
\\( \bigcirc \\) solid

Explanation:

Step1: Identify reaction components

Reaction: $2\text{C}_4\text{H}_{10}(g) + 13\text{O}_2(g)
ightarrow 8\text{CO}_2(g) + 10\text{H}_2\text{O}(g)$
Reactants (left of $
ightarrow$): $\text{C}_4\text{H}_{10}(g)$, $\text{O}_2(g)$
Products (right of $
ightarrow$): $\text{CO}_2(g)$, $\text{H}_2\text{O}(g)$

Step2: Answer Q4 (reactants)

Select the two left-side compounds.

Step3: Answer Q5 (O₂ coefficient)

Find number before $\text{O}_2$ in the reaction.

Step4: Answer Q6 (phase of all compounds)

Check the $(g)$ label after every compound, which means gas.

Answer:

1. $\text{C}_4\text{H}_{10}(g)$, $\text{O}_2(g)$
2. 13
3. gas