4 fill in the blank 1 point fes + 2hcl → h2s + fecl2 how many grams of hcl are needed to produce 50g of h2s…

Explanation:

Step1: Calculate molar mass

The molar mass of $H_2S$ is $M_{H_2S}=(2\times1 + 32)=34\ g/mol$, and the molar mass of $HCl$ is $M_{HCl}=(1 + 35.5)=36.5\ g/mol$.

Step2: Find moles of $H_2S$

The number of moles of $H_2S$, $n_{H_2S}=\frac{m_{H_2S}}{M_{H_2S}}=\frac{50\ g}{34\ g/mol}\approx1.471\ mol$.

Step3: Determine mole - ratio

From the balanced chemical equation $FeS + 2HCl\rightarrow H_2S+FeCl_2$, the mole - ratio of $HCl$ to $H_2S$ is $n_{HCl}:n_{H_2S}=2:1$. So when $n_{H_2S} = 1.471\ mol$, $n_{HCl}=2\times n_{H_2S}=2\times1.471\ mol = 2.942\ mol$.

Step4: Calculate mass of $HCl$

The mass of $HCl$, $m_{HCl}=n_{HCl}\times M_{HCl}=2.942\ mol\times36.5\ g/mol\approx107.4\ g$.

Answer:

$107.4$