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labwork [276]
3 years ago
14

A Variable That Stays The Same In An Experiment Is A ?

Chemistry
1 answer:
hammer [34]3 years ago
3 0
The variable that stays the same in an experiment is called the controlled variable

Hope this helps
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A sample of an unknown substance has a mass of 42g and a volume of
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Answer: 1.5 g/cm^3

Explanation:

Density is mass over volume

42g / 28 cm^3 = 1.5 g/cubic cm

hope this helps

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It is not possible to separate ____ by physical means. HELP
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Compounds are not possible to be separated by physical means 
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Heat is added to a chemical system. Which energy will increase?
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the kinetic energy of the reactant molecules(C)

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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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3 years ago
Which statement about London dispersion forces is true?
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The answer to the question is A.
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