Question

How many moles of NH4NO3(s) must be dissolved in water so that 73.0 kJ of heat is absorbed from the water? (The molar heat of solution of NH4NO3 is 25.7 kJ/mol.)

Answer 1

3.21 mol
9.87 mol
1.09 mol
2.84 mol

Answer 2

any ideas ?

Answer 3

b @mayankdevnani

Answer 4

nope

Answer 5

a @mayankdevnani

Answer 6

\[\large \bf 25.7kJ \rightarrow 1~mol\]
\[\large \bf 1kJ \rightarrow \frac{1}{25.7}~mol\]
then,
\[\large \bf 73 kJ \rightarrow ?~mole\]

Answer 7

can you solve it ?

Answer 8

2.84 @mayankdevnani

Answer 9

correct

Answer 10

Given the equations below, what is the heat of reaction for the process in which carbon monoxide is formed from its elements?

C(s, graphite) + O2(g) → CO2(g), ∆H = –393.5 kJ

CO2(g) → CO(g) + ½O2(g), ∆H = 283.0 kJ

Answer 11

what about that one
@mayankdevnani

Answer 12

676.5 kJ
–676.5 kJ
110.5 kJ
–110.5 kJ

Answer 13

multiply both equations by `2` and then add them

Answer 14

you'll get your answer

Answer 15

i got 676.5

Answer 16

@mayankdevnani

Answer 17

yea! that is correct