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4 years ago

How does food waste contribute to climate change?

Chemistry

1 answer:

m_a_m_a [10]4 years ago

3 0

Answer:

When we waste food, we also waste all the energy and water it takes to grow, harvest, transport, and package it. And if food goes to the landfill and rots, it produces methane—a greenhouse gas even more potent than carbon dioxide.

Explanation:

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Is the number of particles in a substance directly proportional to the grams of a substance OR the

Cloud [144]

Answer: The amount of substance of a system that contains as many elementary entities as there are atoms in 12 g of carbon-12

Explanation:

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3 years ago

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3 years ago

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

Luda [366]

Answer: The mass of $PH_3$ produced is 45.22 g

Explanation:

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)

For $P_4$ :

Given mass of $P_4$ = 62.0 g

Molar mass of $P_4$ = 124 g/mol

Putting values in equation 1, we get:

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

For $H_2$ :

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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3 years ago

Why does common table salt (NaCl) have a high melting point?

Artist 52 [7]

COmmon table salt (NaCl) have a high melting point because it is ionically bonded and it takes a lot of energy to break the electrostatic attractions between the cations and the anions. Hope this answers the question. Have a nice day.

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3 years ago

Need help answering the last two, Its urgent please show how

Nina [5.8K]

I found that, but I think they are not the same average.

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3 years ago