First, we calculate the number of moles of each reactant using the formula:
Moles = mass / molecular weight
CaO:
Moles = 7.15/56 = 0.128
Water:
Moles = 152/18 = 8.44
The reaction equation shows that the reactants must be present in an equal number of moles, so CaO will be the limiting reactant and 0.128 mole of calcium hydroxide will form.
The energy released is given by:
Heat of reaction * number of moles
= -64.8 * 0.128
= -8.29 kJ
8.29 kJ of energy will be released
Sp3. I just took a quiz exact same question and the answer was that I don't know how to get it sorry.
Answer:
Ca^2+
Explanation:
As we know, more energy is required to remove an electron from a positively charged ion than is required to remove an electron from a neutral atom. Hence, the second ionization energy of calcium is greater than its first ionization energy.
However, the third and fourth ionization energies of calcium are much higher than the second ionization energy because they involve removal of electrons from an inner filed shell. This process requires a lot of energy and is often not feasible.
Hence, the most common ion of calcium must be Ca^2+ where only two electrons are removed from calcium.
The total number of carbon atoms in a molecule of ethanoic acid is 2.
Answer: (2) 2
The number of reactants is the same as the number of products is the best statement that describes the conservation of mass in chemical equation
<u>Explanation:</u>
- The conservation of mass conveys that the mass of an seperate system is neither destroyed nor created by the chemical reactions.
- Therefore there should be the same amount of matter when compared to the reactant and product side.
- If the reaction exists by satisfying the above condition it is said to be the balanced chemical equation.
- The Lavoisier stated the law on conservation of mass.