Approximately how many joules of heat are required to raise the temperature of 20 grams of water from 30°C to 40°C? A
134 J
B
168 )
C.
420 j
D.
840 J

The heat required : 840 J

Given

mass of water = 20 g

Temperature : 30°C to 40°C

Required

Heat to raise the temperature

Solution

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  (for water= 4.18 J/g° C)

∆T = temperature difference, ° C / K  

The heat :

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a