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3 years ago

How to balance Mg + O2 > MgO

1 answer:

5 0

<span>Mg + O2 > MgO. In reactant side, 2 O atoms and 1 Mg are present. In product side, 1 Mg and O atoms are present. Put 2 in product side to balance O atoms and 2 at Mg in reactant side to balance Mg atoms. Therefore the balanced equation becomes, 2Mg + O2 ----> 2MgO. Hope it helps.</span>

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Consider a mixture of two gases, A and B, confined in a closed vessel. A quantity of a third gas, C, is added to the same vessel

n200080 [17]

The question is incomplete, here is the complete question:

Consider a mixture of two gases, A and B, confined in a closed vessel. A quantity of a third gas, C, is added to the same vessel at the same temperature. How does the addition of gas C affect the following. The mole fraction of gas B?

A mixture of gases contains 10.25 g of N₂, 2.05 g of H₂, and 7.63 g of NH₃.

<u>Answer:</u> The mole fraction of gas B (hydrogen gas) is 0.557

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

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

<u>For nitrogen gas:</u>

Given mass of nitrogen gas = 10.25 g

Molar mass of nitrogen gas = 28 g/mol

Putting values in equation 1, we get:

$\text{Moles of nitrogen gas}=\frac{10.25g}{28g/mol}=0.366mol$

<u>For hydrogen gas:</u>

Given mass of hydrogen gas = 2.05 g

Molar mass of hydrogen gas = 2 g/mol

Putting values in equation 1, we get:

$\text{Moles of hydrogen gas}=\frac{2.05g}{2g/mol}=1.025mol$

<u>For ammonia gas:</u>

Given mass of ammonia gas = 7.63 g

Molar mass of ammonia gas = 17 g/mol

Putting values in equation 1, we get:

$\text{Moles of ammonia gas}=\frac{7.63g}{17g/mol}=0.449mol$

Mole fraction of a substance is given by:

$\chi_A=\frac{n_A}{n_A+n_B+n_C}$

Moles of gas B (hydrogen gas) = 1.025 moles

Total moles = [0.366 + 1.025 + 0.449] = 1.84 moles

Putting values in above equation, we get:

$\chi_{(H_2)}=\frac{1.025}{1.84}=0.557$

Hence, the mole fraction of gas B (hydrogen gas) is 0.557

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3 years ago

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<u>Ecologist:</u> relationships between organisms and the hot spring.
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<u>Meteorologist:</u> atmosphere and weather around the hot spring.

<h3>What is a scientific observation?</h3>

A scientific observation can be defined as an active acquisition of knowledge (information) through one of the sense organs, while using scientific tools and instruments.

<h3>The types of scientific observation.</h3>

In Science, there are two main types of scientific observation and these include the following:

Qualitative observation

Quantitative observation

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In this exercise, you're required to match each kind of scientist with an aspect of the hot spring he or she is most likely to study as follows:

<u>Geologist:</u> rocks around and under the hot spring.
<u>Ecologist:</u> relationships between organisms and the hot spring.
<u>Sociologist:</u> human behavior around the hot spring.
<u>Meteorologist:</u> atmosphere and weather around the hot spring.

Read more on hot springs here: brainly.com/question/4421633

#SPJ1

Complete Question:

Match each kind of scientist with an aspect of the hot spring she or he might study.

A. Geologist

B. Ecologist

C. Sociologist

D. Meteorologist

1. Relationships between organisms and the hot spring.

2. Human behavior around the hot spring.

3. Rocks around and under the hot spring.

4. Atmosphere and weather around the hot spring.

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