Plz answer all of these question thanks

Ammonia is formed according to the reaction below. A chemist mixes 21 grams of nitrogen gas and 18 grams of hydrogen gas in a 2.

Rama09 [41]

Answer : The mass of hydrogen gas consumed will be, 4.5 grams

Explanation : Given,

Mass of $N_2$ = 21 g

Mass of $H_2$ = 18 g

Molar mass of $N_2$ = 28 g/mole

Molar mass of $H_2$ = 2 g/mole

First we have to calculate the moles of $N_2$ and $H_2$ .

$\text{Moles of }N_2=\frac{\text{Mass of }N_2}{\text{Molar mass of }N_2}=\frac{21g}{28g/mole}=0.75moles$

$\text{Moles of }H_2=\frac{\text{Mass of }H_2}{\text{Molar mass of }H_2}=\frac{18g}{2g/mole}=9moles$

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

$N_2(g)+3H_2(g)\rightarrow 2NH_3(g)$

From the given balanced reaction, we conclude that

As, 1 mole of $N_2$ react with 3 moles of $H_2$

So, 0.75 moles of $N_2$ react with $3\times 0.75=2.25$ moles of $H_2$

From this we conclude that, $H_2$ is an excess reagent because the given moles are greater than the required moles and $N_2$ is a limiting reagent because it limits the formation of product.

The moles of hydrogen gas consumed = 2.25 mole

Now we have to calculate the mass of hydrogen gas consumed.

$\text{Mass of }H_2=\text{Moles of }H_2\times \text{Molar mass of }H_2$

$\text{Mass of }H_2=(2.25mole)\times (2g/mole)=4.5g$

Therefore, the mass of hydrogen gas consumed will be, 4.5 grams

5 0

4 years ago

1. an adaptation to meet the need for food:A

True [87]

An adaptation is a physical or behavioral feature that helps an animal stay alive.

1. An adaptation an animal needs to meet the need for food: Sharp teeth.
An adaptation to meet the need for water: A tongue.
An adaptation for shelter: Sharp claws to climb trees for shelter.

3. Starts storing more fat, bears a warmer coat, and sleeps for hibernation.

5. If it's cold outside, fur can help keep an animal warm. A chameleon uses his skin (or covering) to blend into this surroundings.

6. "A". Sharp eyesight.

I hope this helped you!

4 0

3 years ago

A chemical equation lists the atoms involved in a reaction? A. True. B. False

salantis [7]

Answer:

a would be the correct answer

8 0

4 years ago

Different enzymes that catalyze the same reaction are known as _____.

maw [93]

Answer:

Isozymes

Explanation:

Isozymes are enzymes that differ in amino acid sequence but catalyze the same chemical reaction. These enzymes usually display different kinetic parameters, or different regulatory properties.

7 0

3 years ago

What does every force have?

stealth61 [152]

A force has both size and direction.

5 0

3 years ago