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Anuta_ua [19.1K]
3 years ago
12

Calculate the mass of 9.75x1021 atoms of helium.

Chemistry
1 answer:
Leya [2.2K]3 years ago
5 0

Answer: 99.5475

Hope this helps(:

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Do you think a colony on Mars should be nearer the northern or southern<br> polar cap? Explain.
Ksju [112]

Answer:

nearer to the north pole

Explanation:

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7 0
3 years ago
what volume of hydrogen gas is evolved from a reaction between 0.52 g of Na and water? This gas is collected at 20 C and 745mmHg
guapka [62]
The  volume of  hydrogen  gas  that evolved  is   calculated  as  follows
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that  is  PV = nRT
P=745  mm hg
V= ?
R(gas  constant)= 62.36 L.mm hg/mol.k
T= 20 + 273 = 293 k
n=number  of  moles which is calculated as  follows
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= 0.52/23=0.023  moles

write the reacting equation
2Na +2H2O =2NaOH +H2
by  use  of reacting  ratio  between  Na : H2  which  is  2:1  therefore  the mole  of H2 = 0.023/2 =0.0115  moles

by  making  the  volume  the   subject  of  the formula
v=nRT/P
V= (0.0115 x 62.36  x 293) / 745  = 0.283 L


6 0
3 years ago
What happened after the gas syringe was inserted into the flask with the methane gas?
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Within the categories of homogeneous and heterogeneous mixtures there are more specific types of mixturesincluding solutions, alloys, suspensions, and colloids. A solutionis a mixture where one of the substances dissolves in the other. The substance that dissolves is called the solute.
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