Question

Given the unbalanced reaction: P₄+ O₂ "\rightarrow" align="absmiddle" class="latex-formula"> P₄O₁₀ How many moles of O₂ are needed to produce 14.2 grams of P₄O₁₀­?
a. 0.125 mol
b. 0.0620 mol
c. 0.500 mol
d. 0.0500 mol
e. 0.250 mol

Answer 1

Answer:

The correct answer is option e.

Explanation:

$P_4+ 5O_2 \rightarrow P_4O_{10}$

Moles of phosphorus pent-oxide :

$\frac{14.2 g}{284 g/mol}=0.05 mol$

According to reaction, 1 mole of phosphorus pent-oxide is obtained from 5 moles of oxygen gas.

Then 0.05 mole of  phosphorus pent-oxide will be obtained from:

$\frac{5}{1}\times 0.05 mol=0.25 mol$

Hence,the correct answer is option e.