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3 years ago

What are the 5 signs of chemical change?

Chemistry

1 answer:

frez [133]3 years ago

6 0

Answer:

Color change, formation of a precipitate, formation of a gas, odor change, temperature change.

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1. A gas having the following composition is burnt under a boiler with 50% excess air.

jeka94

The composition of the stack gas are :

$CH_4$ = 0.8713

$C_3H_8$ = 0.0202

CO = 0.107

<h3 /><h3>What is a mole fraction?</h3>

The ratio of the number of moles of one component of a solution or other mixture to the total number of moles representing all of the components.

Assuming 100 g of the stack gas. Calculate the mass of each species in this sample according to their percentages.

Mass of $CH_4$ : 70% of 100 g = 70 g

Mass of $C_3H_8$ : 15% of 100 g = 15 g

Mass of CO : 15% of 100 g = 15 g

Now calculate the number of moles of each species:

Number of moles of $CH_4$ : $\frac{70 g}{16.04 g/mol}$ = 4.3 mole

Number of moles of $C_3H_8$ : $\frac{15 g}{144.1 g/mol}$ = 0.10 mole

Mass of CO : $\frac{15 g}{28.01 g/mol}$ = 0.53 mole

Now to calculate the mole fraction of each we use the formula:

Mole fraction of $CH_4$ : $\frac{4.3}{4.935}$ = 0.8713

Mole fraction of $C_3H_8$ : $\frac{0.10}{4.935}$ = 0.0202

Mole fraction of CO : $\frac{0.53}{4.935}$ = 0.107

Hence, composition of the stack gas are:

$CH_4$ = 0.8713

$C_3H_8$ = 0.0202

CO = 0.107

Learn more about mole fraction here:

brainly.com/question/13135950

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8 0

3 years ago

Avery has a glass of pure water. She pours a tablespoon of sugar into the water to make it taste sweet.

SSSSS [86.1K]

The first blank is a compound, second is a mixture

8 0

4 years ago

Which of the following statements about this reaction is true:

Semmy [17]

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The Correct statement is ~

A. The reaction releases heat

As we can observe, there's heat in product side of the given equation that shows - In the given reaction heat is released making it an exothermic reaction ~

I hope it helps ¡

$\mathrm{✌TeeNForeveR✌}$

6 0

2 years ago

Which sensory organs help us gather information by seeing things like shapes, colors, and motion around us?

astra-53 [7]

By using eyes we can see shapes, colors, and motion around us.

5 0

3 years ago

Read 2 more answers

What is the mass number of an ion with 108 electrons, 157 neutrons, and a 1 charge?

levacccp [35]

The answer is 264.12

The element is Bh (Bohrium). If the ion has a 1 charge, the charge can either be 1+ or 1-. So the ion has to be an element with the atomic number 107 or 109 (Bh or Mt). Using simple math, subtract the atomic number from the mass number to equal 157.

264 - 107 = 157

3 0

3 years ago