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attashe74 [19]
3 years ago
12

D

Chemistry
2 answers:
Feliz [49]3 years ago
7 0

Answer:

Be, Mg, Ca, Sr are in the same group

Explanation:

these elements are in alkaline earth metals

mark in as a brainly plz

Dmitry [639]3 years ago
7 0

Answer:I think maybe...

Explanation:

W, Re, Hs, Mt

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In the world of chemisty, a 'mole is a number of something ... a very lary large number of something.
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Just as a dozen is 12 of something, a mole is about 6.02 * 10^23 of something .
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What is a type of mechanical weathering in which rocks are broken by the expansion of water as it freezes in joints, pores, or b
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irozion

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Gases with high molecular weights diffuse more slowly than gases with lower molecular weights.
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How are air pressure and temperature related during this time period?
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3 years ago
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

#SPJ1

8 0
3 years ago
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