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Hi I need help on question 3 and question 4. I don't

understand how to do it and got it wrong on my first attempt. Thank you so much for the help

ari
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Quiz: HW 13
An Ideal Gaseous Reaction Occurs At A Constant Pre... I...
D
Question 3
0.2 pts
When 3.0 grams of H2 is reacted with excess C at constant pressure, the reaction forms CH4 and
releases 54.9 kJ of heat
C(s) + 2 H2(8) --&gt; CH4(g)
What is the enthalpy of the reaction in kJ/mol of CH4?
Enter your answer numerically and in terms of kJ/mol.
D
Question 4
0.3 pts
In the following experiment, a coffee-cup calorimeter containing 100 g of H20 is used. The initial
temperature of the calorimeter is 23.0 .C. If 6.7 g of CaClyis added to the calorimeter, what will be
the final temperature of the solution in the calorimeter? Assume that the heat capacity of the
solution is 4.18 J/gC, and that the heat capacity of the calorimeter is negligible.
The heat of dissolution AHsoin of CaCl2 is -82.8 kJ/mol.
Enter your answer numerically in terms of C.
D
Question 5
0.2 pts
7
Q

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