Chemistry, 24.01.2020 23:31 idcbrooo

If 4.05 g of kno₃ reacts with sufficient sulfur (s₈) and carbon (c), how much p-v work will the gases do against an external pressure of 1.00 atm given the densities of nitrogen and carbon dioxide are 1.165 g/l and 1.830 g/l, respectively, at 20°c?

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Answer from: mamieengler

Explanation:

Chemical reaction equation for the given reaction is as follows.

$2KNO_{3}(s) + \frac{1}{8}S_{8}(s) + 3C(s) \rightarrow K_{2}S(s) + N_{2}(g) 3CO_{2}(g)$

Therefore, we will calculate the number of moles of $KNO_{3}$ as follows.

No. of moles = $\frac{mass}{\text{molar mass}}$

= $\frac{4.05 g}{101.1 g/mol}$

= 0.04 mol

Number of moles of nitrogen gas formed is calculated as follows.

No. of moles = $\frac{1}{2} \times \text{no. of moles of KNO_{3}}$

= $\frac{1}{2} \times 0.04 mol$

= 0.02 mol

Mass of $N_{2}$ gas formed will be calculated as follows.

No. of moles × Molar mass of $N_{2}$

= $0.02 mol \times 28.0 g/mol$

= 0.56 g

Now, the number of moles of $CO_{2}$ formed is as follows.

= $\frac{3}{2} \times 0.04$

= 0.06 mol

Hence, mass of $CO_{2}(g)$ formed will be as follows.

$0.04 mol \times 44 g/mol$

= 1.76 g

Volume of $N_{2}(g)$ is calculated as follows.

Volume = $\frac{mass}{density}$

= $\frac{0.56 g}{1.165 g/L}$

= 0.48 L

And, volume of $CO_{2}$ is calculated as follows.

Volume = $\frac{mass}{density}$

= $\frac{1.76 g}{1.830 g/L}$

= 0.96 L

Let us assume that the volume of solids are negligible. Therefore, total volume will be as follows.

$\Delta V$ = (0.48 L + 0.96 L)

= 1.44 L

Relation between work, pressure and volume is as follows.

w = - $P_{ext} \times \Delta V$

= - $1.00 atm \times 1.44 L$

= -1.44 atm L

As 1 tm L = 101.3 J. So, convert 1.44 atm L into joules as follows.

$1.44 \times 101.3 J$

= 145.87 J

Thus, we can conclude that the given gases will do 145.87 J of work.

Answer from: Quest

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

Answer from: Quest

the answer is d. matter from the air combined with the steel wool.

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If 4.05 g of kno₃ reacts with sufficient sulfur (s₈) and carbon (c), how much p-v work will the gase...

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