The molar heat of fusion for iron with a mass of 200.0g releases 9,840 cal when it freezes at its freezing point is 2,747.7 cal/mol.
<h3>How to calculate molar heat of fusion?</h3>
The heat of fusion of a substance can be calculated by using the following formula:
Q = m∆H
Where:
- Q = quantity of heat
- m = mass
- ∆H = change in temperature of fusion
However, the quantity of heat has been given as 9840calories. The molar heat of fusion of iron can be calculated by dividing the heat of fusion by the number of moles of iron.
Moles of iron = mass ÷ molar mass
moles = 200g ÷ 55.8g/mol
moles = 3.58moles
molar heat of fusion = 9840 cal ÷ 3.58mol
molar heat of fusion = 2748.6 cal/mol
Therefore, the molar heat of fusion for iron with a mass of 200.0g releases 9,840 cal when it freezes at its freezing point is 2,747.7 cal/mol.
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The pH will start high and decrease, as opposed to starting low in increasing, but the buffer region is still at the beginning and the equivalence point is still in the middle.
<h3>What is weak acid?</h3>
Corrosive strength is the propensity of a corrosive, represented by the synthetic recipe HA, to separate into a proton, H+, and an anion. Powerless acids don't totally separate into their particles in water. For instance, HF separates into the H + and F - particles in water, yet some HF stays in arrangement, so it's anything but a solid corrosive. There are a lot more powerless acids than solid acids. Most natural acids are feeble acids. A feeble corrosive isn't totally ionized in arrangement. For instance, hydrofluoric corrosive, HF, is a feeble corrosive. At the point when broken up in water, HF particle exist in balance with H +, which responds with water to shape hydronium, and F - particles. Since the corrosive doesn't totally separate into its ionic parts, it is a frail corrosive.
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Answer:
0.72 moles of hydrochloric acid are needed to completely react with 0.36 mol of lead.
Explanation:
The balanced reaction is:
Pb + 2 HCl → PbCl₂ + H₂
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reagent participate:
You can apply the following rule of three: if by stoichiometry of the reaction 1 mole of Pb reacts with 2 moles of HCl, 0.36 moles of Pb will react with how many moles of HCl?
amount of moles of HCl= 0.72 moles
<u><em>0.72 moles of hydrochloric acid are needed to completely react with 0.36 mol of lead.</em></u>
