Question

select the correct answer. given sno₂ + 2h₂ → sn + 2h₂o. tin oxide reacts with hydrogen to produce tin and water. how many moles of sno₂ are needed to produce 500.0 grams of sn? a. 1.57 b. 4.21 c. 634.8 d. 59.350

Explanation:

Step1: Calculate molar mass of Sn

The molar mass of Sn (tin) is approximately 118.71 g/mol.

Step2: Calculate moles of Sn

Use the formula $n=\frac{m}{M}$, where $m = 500.0$ g and $M=118.71$ g/mol. So $n=\frac{500.0}{118.71}\approx4.21$ mol.

Step3: Determine mole - ratio from chemical equation

From the balanced chemical equation $SnO_2 + 2H_2
ightarrow Sn+2H_2O$, the mole - ratio of $SnO_2$ to $Sn$ is 1:1. So the moles of $SnO_2$ needed is equal to the moles of $Sn$ produced.

Answer:

B. 4.21