Question

How much heat do you need to raise the temperature of 150 g of gasoline from -30oC to -15oC?

SUBSTANCE���������C(J/g-^0C)
WATER ��������� 2.05
IRON ��������� 0.46
ALUMINUM ��������� 0.90
GOLD ��������� 0.13
COPPER ��������� 0.39
AMMONIA (LIQUID)���������4.70
ETHANOL ���������2.44
GASOLINE���������2.22
WATER (LIQUID)���������4.18
WATER (VAPOR)���������2.08
Air (25^0C)���������1.01
OXYGEN���������0.92
HYDROGEN���������14.30

4.68 kJ

5.00 kJ

6.66 kJ

9.40 kJ

Answer 1

9.40??

Answer 2

nope
check again

Answer 3

ok hold on let me do this again

Answer 4

GASOLINE's specific heat capacity is c = 2.22
mass is = 150
and temperature change is = -15 - (-30) =
so
\[\sf Q = mc \Delta T\]
so you multiply all the variables given

Answer 5

u took c of water by mistake

Answer 6

4.68?

Answer 7

nope
Q = 150 x 2.22 x 15
=

Answer 8

4995

Answer 9

yep so when u divide it by 1000 = you get 4.995 kJ and rounding off you'll get around ....?

Answer 10

Im not getting this -.-'

Answer 11

:(

Answer 12

well look
we dont always get exact answers when it comes to mcqs
so you choose the answer closest to yours
and closest to your is 5.0 kJ
5000 is closer to 4995 or 4680 ?

Answer 13

i mean which is 4995 closest to?

Answer 14

yeah 5000 I got you now