Answer:
0.25J
Step-by-step explanation:
Given parameters: 
Mass of water = 0.2706g 
temperature change = 0.216°C
Unknown: 
Amount of heat added = ? 
Solution: 
The quantity of heat added to a substance is given by the expression below; 
 H = m c Δt 
where m is the mass of the body
 c is the specific heat capacity
 Δt is the temperature change
specific heat capacity is a constant and for water the value is 4.2J/g°C
 Input the variables to solve for H; 
 H = 0.2706 x 4.2 x 0.216 = 0.25J