<h3>
Answer:</h3>
59.878 Kilo joules
<h3>
Explanation:</h3>
We are given;
- Molar heat of vaporization for water as 10.79 kJ/mol
- Mass of water 100 grams
We are required to calculate the amount of energy absorbed to convert water to ice.
- We need to know that the process of conversion of water to steam without change in temperature is known as vaporization or boiling.
- Therefore, heat absorbed is calculated by multiplying the mass of water or the number of moles by heat of vaporization.
- That is, Q = m × ΔHf
- When given the number of moles and the molar heat of vaporization, then Q = n × ΔHf
In this case;
Mass of water = 100 g
But, molar mass of water = 18.02 g/mol
Moles of water = 100 g ÷ 18.02 g/mol
= 5.549 Moles
Therefore;
Q = 5.549 moles × 10.79 kJ/mol
= 59.878 Kilo joules
The heat of a chemical reaction (change of enthalý) may be calcualted as the heat of formation of the products less the heat of formation of the reactants.
Then, for the given equation, the total heat of the combustion of pentnae is:
<span>ΔH°f = 5* ΔH°f CO2(g) + 6ΔH°f H2O(g) - ΔH°f C5H12(g) - 8ΔH°f O2(g)
</span>The standard heat of formation of O2(g) is zero because that is its natural state.
Now you can replace in the equation the values given:
<span>ΔH° = 5*(-393.5 kJ/mol) + 6*(-241.8kj/mol) - (-35.1kJ/mol) - 0
ΔH° = -3,383.2 kJ/mol
</span>
Then, the heat of the combustion of pentane is -3,383.2 kj/mol
1) Acidic - gastric juices pH 1, lemon juice pH 2.2, tomato juice pH 4.
2) Neutral - salt solution pH 7.
3) Alkaline - baking soda pH 9, bleach pH 13.
pH is a numeric scale used to specify the acidity or basicity of an aqueous solution.
When pH is less than seven (pH<7), solution is acidic.
When is equal seven (pH = 7), solution is neutral.
When pH is greater than seven (pH > 7), solution is basic.
Answer: The SI unit of force is the newton, symbol N.
Explanation: