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kap26 [50]
3 years ago
7

Need some help :( !!

Chemistry
1 answer:
Ray Of Light [21]3 years ago
6 0
Can you take picture of the whole question? I can’t see.
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When 7.085 grams of a hydrocarbon, CxHy, were burned in a combustion analysis apparatus, 21.71 grams of CO2 and 10.37 grams of H
Taya2010 [7]

Answer:

- Empirical:

C_3H_7

- Molecular:

C_6H_{14}

Explanation:

Hello,

In this case, based on the information regarding the combustion, the moles of carbon turn out:

n_C=21.71gCO_2*\frac{1molCO_2}{44gCO_2}*\frac{1molC}{1molCO_2}=0.493molC

Moreover, the moles of hydrogen:

n_H=10.37gH_2O*\frac{1molH_2O}{18gH_2O}*\frac{2molH}{1molH_2O}=1.152molH

Thus, the subscripts of carbon and hydrogen in the hydrocarbon turn out:

C=\frac{0.4934}{0.4934}=1\\H=\frac{1.15222}{0.4934}=2.335\\CH_{2.335}

Now, looking for a suitable whole number we obtain the following empirical formula as 2.335 times 3 is 7 for hydrogen:

C_3H_7

In such a way, that compound has a molar mass of 43 g/mol, thus, the whole compound's molar mass is 86.18 g/mol for which the molecular formula is twice the empirical one, therefore:

C_6H_{14}

Which is hexane.

Best regards.

6 0
3 years ago
What are two benefits of scientists using a diagram to model the water cycle?
tatiyna
I believe that the answer is A i could be wrong though.
5 0
2 years ago
What do you think is the reason for an increasing atomic radius within one group?
Anna35 [415]

Answer:

As you go down a group on the periodic table, you get more electron shells and therefore a larger atomic radius.

7 0
2 years ago
Read 2 more answers
A 5.0-kg box is pushed across the floor with a force of 32 N. What is the frictional force on the box if the box's acceleration
Slav-nsk [51]
From\ 2nd\ Newton\ Law\ resultuant\ force: \\\\\ F_R=m*a=5kg*3,6\frac{m}{s^2}=18N\\\\
F=32N\\\\
F_f- friction\ force\\\\
F_R=F-F_f\\\\
F_f=F-F_R=32N-18N=14N\\\\Friction\ force\ is\ equal\ to\ 14\ N.
3 0
3 years ago
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What is the h+ of a solution with a ph of 5.6
7nadin3 [17]
Just have to do antilog

[H+]= 10^-5.6
6 0
2 years ago
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