Question

PLEASE HELP!!

Answer 1

Answer : The mass of chlorine gas produced are, 26.95 grams.

Explanation : Given,

Mass of HCl = 27.8 g

Molar mass of HCl = 36.46 g/mole

First we have to calculate the moles of hydrochloric acid.

$\text{Moles of HCl}=\frac{\text{Mass of HCl}}{\text{Molar mass of HCl}}=\frac{27.8g}{36.46g/mole}=0.76mole$

Now we have to calculate the moles of chlorine gas.

The given balanced chemical reaction is,

$4HCI(aq)+O_2\rightarrow 2CI_2(g)+2H_2O(I)$

From the given balanced chemical reaction, we conclude that

As, 4 moles of hydrochloric acid react to give 2 moles of chlorine gas

So, 0.76 moles of hydrochloric acid react to give $\frac{2}{4}\times 0.76=0.38$ moles of chlorine gas

Now we have to calculate the mass of chlorine gas.

$\text{Mass of }Cl_2=\text{Moles of }Cl_2\times \text{Molar mass of }Cl_2$

Molar mass of $Cl_2$ = 70.91 g/mole

$\text{Mass of }Cl_2=0.38mole\times 70.91g/mole=26.95g$

Therefore, the mass of chlorine gas produced are, 26.95 grams.

Answer 2

Number of moles of HCl = $\frac{mass (g)}{molar mass}$
                = $\frac{27.8 g}{36.45}$ = 0.763 mole
From balanced equation:
4 moles of HCl give 2 moles Cl2
0.763 mole HCl give ?? mole Cl2
by cross multiplication :
= 0.38 mole Cl2
mass of Cl2 = moles x molar mass = 0.38 x 70.9 = 27 g