Your answer would be A for your homework
The correct answer is D
According to the law of conservation of mass, mass can not be destroyed or lost, it can just be rearranged in space, turned into energy etc.
Therefore, in our of example the wood was burned and turned into ashes. Even though the ashes weight less than the original wood, some of the solid mass of the wood was converted to gas and energy, so the overall mass remained the same.
Moles H2O = 1233 g/ 18 g/mol=68.5 68.5 x 40.7 =2788 kJ
Answer:
1·199 J
Explanation:
Given
Mass of water = 0·814 g = 0·814 ×
kg
Increase in temperature = 0·351 °C
Let the amount of heat added be Q J
Formula for heat added is
<h3>Q = m × s × ΔT</h3>
where Q is the amount of heat transferred
m is the mass
s is the heat capacity
ΔT is the change in temperature
Heat capacity of water = 4200 J/kg °C
Applying the formula for heat added
Q = 0·814 ×
× 4200 × 0·351 = 1·199 J
∴ Amount of heat added = 1·199 J
The answer is b
hope I was helpful. ..