[krish3kool]

1.
The specific heats (in units of J/g•K) of H2O, CH3NH2, and N2H4 are 4.1833, 3.2830, and 3.0906,
respectively. What is the order of the molar heat capacities? Formula weights: H2O 18.0; CH3NH2 31.1; N2H4
32.0
(a) H2O>CH3NH2>N2H4 (b) H2O>N2H4>CH3NH2 (c) CH3NH2>H2O>N2H4
(d) CH3NH2>N2H4>H2O (e) N2H4>H2O>CH3NH2


2.
What is "deltaE" for a system which has the following two steps? Step 1: The system absorbs 40 J of heat while doing 60 J of work. Step 2: The system absorbs 80 J of heat while 20 J of work is performed on it.
(a) -200 J (b) -40 J (c) zero J (d) 80 J (e) 120 J

Can anyone help me with these questions?....i'd appriciate it....thank you!

[Arkcon]

Step 1:
Calm the heck down:

http://www.chemicalforums.com/index.php?topic=22374.msg85614#msg85614

http://www.chemicalforums.com/index.php?topic=22373.msg85613#msg85613

http://www.chemicalforums.com/index.php?topic=22361.msg85576#msg85576

Step 2:
Show us what you have so far.  A formula, something from class, anything like that.