45 2.0
2. how many joules of heat are needed to raise the temperature of 048 kg of aluminum from 21°c to
94°c, if the specific heat of aluminum is 900 j/g °c?

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.