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antoniya [11.8K]
3 years ago
11

The atomic mass of hydrogen is 1.01. What is the mass of hydrogen in one mole of aluminum hydroxide (Al(OH)3)?

Chemistry
1 answer:
guajiro [1.7K]2 years ago
4 0
The answer is 3.03 g

Ar(H) = 1.01 g/mol
Since there are three atoms in Al(OH)3, the total atomic mass of hydrogen in Al(OH)3 is:
3 * Ar(H) = 3 * 1.01 g/mol = 3.03 g/mol

The mass (m) is atomic mass (Ar) divided by the number of moles n):
m = Ar/n
Ar = 3.03 g/mol
n = 1 mol
m =  3.03 g/mol / 1 mol = 3.03 g

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The pressure of a sample of helium is 1.556 atm in a 268.5 mL container. If the container is compressed to 112.4 mL without chan
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Answer:

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(1.556[atm])(268.5[mL])=P_2(112.4[mL])

\dfrac{(1.556[atm])(268.5[mL\!\!\!\!\!\!\!\!{--}])}{112.4[mL \!\!\!\!\!\!\!\!{--}]}=\dfrac{P_2(112.4[mL]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----})}{112.4[mL]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----}}

3.716957[atm]=P_2

It seems like the answer should have 4 significant figures since all of the other quantities have 4 significant figures, but the closest answer choice of those provided is a.  3.72

3 0
2 years ago
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7 0
3 years ago
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