November 25, 2015

Homework Help: Chemistry(Please check)

Posted by Hannah on Friday, January 20, 2012 at 9:55pm.

1)A piece of metal with a mass of 5.50 grams changed in temperature from 25 to 55 degrees celsius when 21.3 joules was absorbed. What is the specific heat of the metal?

d) 7.75
e)0.710 Jg^-1 C^-1

I chose 7.75 because I did 5.50/21.3 and then multiplied by 30.

2)Which of the following equations represents a reaction for which the delta H can be called a standard enthalpy of formation, delta Hf?

a) FeO(s) + CO2(g) -> FeCO3(s)
b) 1/2 N2(g) + 2 O(g) -> NO2(g)
c) 2 Na(s) + Cl2(g) -> 2 NaCl(s)
d) Ba(s) + N2(g) + 3 O2(g) -> Ba(NO3)2(s)

e) more than one of the four equations above are standard enthalpies of formation.

I chose answer e.

Are these correct?

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