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Anarel [89]
2 years ago
10

How many moles contain 9.75x10^20 molecules of carbonic acid?

Chemistry
1 answer:
pochemuha2 years ago
8 0

Answer:

1 mole of carbonic acid=6.023×10^23 molecules

now

9.74×10^20molecules=

1/(6.023×10^23 molecules)×9.74×10^20molecules

=<em><u>1.617×10^-3 mole </u></em>

is your answer.

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If a gas has a volume of 750 mL at 25oC, what would the volume of the gas be at 55oC?
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Answer:

The answer to your question is     V2 = 825.5 ml

Explanation:

Data

Volume 1 = 750 ml

Temperature 1 = 25°C

Volume 2= ?

Temperature 2 = 55°C

Process

Use the Charles' law to solve this problem

                V1/T1 = V2/T2

-Solve for V2

                V2 = V1T2 / T1

-Convert temperature to °K

T1 = 25 + 273 = 298°K

T2 = 55 + 273 = 328°K

-Substitution

                V2 = (750 x 328) / 298

-Simplification

                V2 = 246000 / 298

-Result

                V2 = 825.5 ml

             

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