Homework Help: Chemistry DrBob

Posted by Ben on Wednesday, April 27, 2011 at 10:39pm.

I don't understand how you get the answer. I really don't understand any of this, how do I set it up with the numbers? once i get how to do this, then i feel i will understand how to set these up from here on out. so if you could, show all your work, thanks

(A). A reaction with a known q is performed in a bomb calorimeter and is found that 10.0 kj of heat is required to raise the temperature of the calorimeter by 2.15 degrees C. calculate the heat capacity of the calorimeter.

(B). When 1.00 g of C2H6(g) is burned in the bomb calorimeter from (A), the temperature rises from 22.00 degrees C to 33.13 degrees C. calculate q for the combustion of C2H6(g) as performed

Chemistry DrBob - DrBob222, Wednesday, April 27, 2011 at 11:00pm
q = Ccal x delta T
Ccal = 10,000/2.15 = 4651.2 J/K

q = [mass H2O x specific heat H2O x delta T] + [Ccal*delta T]
q = [150 x 4.184 x (33.13-22.00)] + [4651.2*(33.13-22.00)] = ??
I didn't watch my significant figures in the above. You need to take care of that after your calculation.

In #1, the heat capacity is the heat generated/degree rise in T.

In #2, the ethane burns and the water inside the calorimeter tells you how much heat is generated BECAUSE the T of the water is raised. We know the mass of the water, we know the specific heat water, and the rise in T was measured; therefore we can calculate the amount of heat generated. The heat raised the T of BOTH the water AND the calorimeter. So the total Q from burning ethane is just q from the water + q from the calorimeter.
Chemistry DrBob - sherry, Monday, September 24, 2012 at 10:44pm
a 225.0 gram sample of aluminum is heated and the temperature increased from 50.0 celsius to 65.0 celsius for temperature change of 15.0celsius. how many calories of heat was absorbed to produce this temperature?

Answer this Question

Related Questions

Ksp/Ka Questions-Chem - I really don't understand how to set this up. Any ...
Chemistry - What is wrong with or ambiguous about hte phrase "four ...
math - just a little stuck can you help me out? 1.)Sales (in millions) of a ...
rational functions... PLEASE HELPPPPP - A rational function that passes through...
Chemistry - What mass of Cr(OH)3 would be produced if 500ml of 0.250M KOH were ...
science - i do not understand this question and how to anseer it, can someone ...
about Engineering - Electronic and Communication Engineering is mainly ...
7th grade Math - What is a complement in a set using set theory. Please explain ...
Physics - With your equations, I solved for the two unknown variables and got ...
math - what kind of book can help me understand about propabilities,please let ...

For Further Reading

First Name:
School Subject:
Answer: