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labwork [276]
3 years ago
13

How does a refrigerator cool food and drinks

Chemistry
1 answer:
jolli1 [7]3 years ago
4 0

Answer:

The evaporator is located inside a refrigerator and is the part that makes the items in the refrigerator cold. As the refrigerant turns from a liquid into a gas through evaporation, it cools the area around it, producing the proper environment for storing food.

Explanation:

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What is the maximum mass of PH3 that can be formed when 62.0g of phosphorus reacts with
Luda [366]

<u>Answer:</u> The mass of PH_3 produced is 45.22 g

<u>Explanation:</u>

Limiting reagent is defined as the reagent which is completely consumed in the reaction and limits the formation of the product.

Excess reagent is defined as the reagent which is left behind after the completion of the reaction.

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}} ......(1)

  • <u>For </u>P_4<u>:</u>

Given mass of P_4 = 62.0 g

Molar mass of P_4 = 124 g/mol

Putting values in equation 1, we get:

\text{Moles of }P_4=\frac{62.0g}{124g/mol}=0.516mol

  • <u>For </u>H_2<u>:</u>

Given mass of H_2 = 4.00 g

Molar mass of H_2 = 2 g/mol

Putting values in equation 1, we get:

\text{Moles of }H_2=\frac{4.0g}{2g/mol}=2mol

The chemical equation follows:

P_4(g)+6H_2(g)\rightarrow 4PH_3(g)

By stoichiometry of the reaction:

If 6 moles of hydrogen gas reacts with 1 mole of P_4

So, 2 moles of hydrogen gas will react with = \frac{1}{6}\times 2=0.333mol of P_4

As the given amount of P_4 is more than the required amount. Thus, it is present in excess and is considered as an excess reagent.

Thus, hydrogen gas is considered a limiting reagent because it limits the formation of the product.

By the stoichiometry of the reaction:

If 6 moles of H_2 produces 4 mole of PH_3

So, 2 moles of H_2 will produce = \frac{4}{6}\times 2=1.33mol of PH_3

We know, molar mass of PH_3 = 34 g/mol

Putting values in equation 1, we get:

\text{Mass of }PH_3=(1.33mol\times 34g/mol)=45.22g

Hence, the mass of PH_3 produced is 45.22 g

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