<span>Oil and natural gas were formed from sea creatures. The energy stored in the fossil fuels originally came from sunlight. Plants used light energy from the Sun for photosynthesis to make their chemicals. This stored chemical energy was transferred to stored chemical energy in animals that ate the plants.</span>
<span>Molality = moles of solute divided by kilograms of solvent
In this case let’s assume a 100g sample solution:
Since its 10.5% by mass, there is 10.5g glucose. The rest of the 89.5g is water.
Divide the 10.5g glucose by its molar mass (180g) to get the # of moles, which is 0.058moles
So now we have 0.058mole glucose divided by 0.089kilograms of water: the answer is 0.65molal</span>
Answer:
C. The enthalpy of a reaction is the sum of the enthalpies of intermediate reactions.
Explanation:
The heat of any reaction ΔH∘f for a specific reaction is equal to the sum of the heats of reaction for any set of reactions which in sum are equivalent to the overall reaction.
