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astraxan [27]
2 years ago
11

Is anyone good at 10th grade chemistry ? If so can you help me please

Chemistry
1 answer:
Harrizon [31]2 years ago
5 0

Answer:

221.7 K

Explanation:

As, PV = nRT

Hence,

6.5 (14) = 5(0.0821)T

91 = 0.4105 T

91 ÷ 0.4105 = T

221.7 = T

Hence the required temperature is <u>221.7 K (Ans)</u>

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Answer:

It is 20. g HF

Explanation:

H2 + F2 ==> 2HF  ...  balanced equation

Since the question is asking us to find the mass of product formed, we will want to first convert the molecules of H2 into moles of H2 (we could do this at the end of the calculations, but it's just as easy to do it now).

moles of H2 present (using Avogadro's number):  

3.0x1023 molecules H2 x 1 mole H2/6.02x1023 molecules = 0.498 moles H2

From the balanced equation, we see that 1 mole H2 produces 2 moles HF.  Therefore, we can now find the theoretical mass of HF produced from 0.498 moles H2:

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The molar mass of HF = 20.01 g/mole, thus...

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