Question

1. m(HCl) = 7,3 гm(NH3) = 4 гнайти: m(NH4Cl) 2.m(Zn) = 13 гn(H2SO4) = 6,3 найти: V(H2)​

Answer 1

Ответ:

NH3+HCl=NH4Cl

M(HCl) =36.5г/моль

М(NH3) =17г/моль

n(HCl) =7.3г/36.5г/моль=0.2моль

n(NH3) =4г/17г/моль=0.24моль

М(NH4Cl) =53.5 г/моль

m(NH4Cl) =M×n=0.2моль×53.5г/моль=10.7 г

M(Zn)=65г/моль

n(Zn)=13г/65г/моль=0.2моль

V(H2) =n×Vm=0.2моль×22.4л/моль=4.48л

Answer 2

To find the mass of $NH_4Cl$ in the first problem, you can start by writing the chemical equation for the reaction between hydrochloric acid ($HCl$) and ammonia ($NH_3$):

$HCl + NH_3 \rightarrow NH_4Cl$

The balanced equation shows that 1 mole of $HCl$ reacts with 1 mole of $NH_3$ to produce 1 mole of $NH_4Cl$.

Given that the molar mass of $HCl$ is approximately 36.46 g/mol and the molar mass of $NH_3$ is approximately 17.03 g/mol, you can compare the masses to determine the limiting reactant. The molar ratio of $HCl$ to $NH_3$ is 1:1 in the balanced equation.

In this case, $m(HCl) = 7.3 g$ and $m(NH_3) = 4 g$. Since the molar ratio is 1:1, $NH_3$ is the limiting reactant.

Now, you can use the molar mass of $NH_4Cl$ to find the mass formed:

$\text{Molar mass of } NH_4Cl = \text{Molar mass of } N + 4 \times \text{Molar mass of } H + \text{Molar mass of } Cl$

$\text{Molar mass of } NH_4Cl = 14.01 + 4 \times 1.01 + 35.45 \, \text{g/mol}$

Calculate the molar mass of $NH_4Cl$, then use it to find the mass formed:

$m(NH_4Cl) = \text{Moles of } NH_3 \times \text{Molar mass of } NH_4Cl$

Now, for the second problem, you want to find the volume of hydrogen gas ($H_2$) produced in the reaction between zinc ($Zn$) and sulfuric acid ($H_2SO_4$).

First, write the balanced chemical equation:

$Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2$

Given that $m(Zn) = 13 g$ and $n(H_2SO_4) = 6.3$, determine the limiting reactant by comparing the moles of $Zn$ and $H_2SO_4$ using their respective molar masses.

Once you identify the limiting reactant, use the stoichiometry of the balanced equation to find the moles of $H_2$ produced. Finally, use the ideal gas law ($PV = nRT$) to find the volume of $H_2$. Note that you may need to convert the volume to the desired units based on the given data.

I hope this helps! Let me know if you have any questions or if there's anything else I can do for you.