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Lana71 [14]
3 years ago
14

What is the mass in grams of one mole of any substance know as

Chemistry
1 answer:
likoan [24]3 years ago
3 0
Q. What is the mass in grams of one mole of any substance know as

A. Molar Mass
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We have to know the number of molecules present in 500 g of water.

The answer is: zero molecules present in 500g of water.

Water molecule is H₂O. In water molecule, nitrogen molecule can not be present. Molecular mass of water is 18 g. MOlecular mass of nitrogen molecule is 28 g.

500 g water contains 500/18 number of moles= 27.77 moles of water molecules which contains 27.77 X 6.023 X 10²³ number of water molecules.

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You need a 70% alcohol solution. On hand, you have a 135 mL of a 20% alcohol mixture. You also have 85% alcohol mixture. How muc
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To obtain the desired solution:

450 mL of 85% alcohol solution is needed to obtain the desired solution.  

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Let x be the amount of the 85% alcohol required

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The total amount of the "pure" alcohol is the sum

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It should be equal to the amount of the "pure" alcohol in the mixture, which is = 0.70× (x+135) ml.

So, your "pure alcohol" equation is,  

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0.85x + 0.20×135 = 0.70x + 0.70×135,

0.85x - 0.70x = 0.70×135 - 0.20×135,

0.15x = 67.5

x = 67.5/0.15

= 450mL.

Learn more about the alcohol solution here,

brainly.com/question/12246176

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