calculate the heat required to melt 25.7 g of solid methanol at its melting point

We have that for the Question,it can be said that the heat required to melt 25.7 g of solid methanol at its melting point is

Q=2.6kJ

From the question we are told

Calculate the heat required to melt 25.7 g of solid methanol at its melting point

Generally the equation for Heat is mathematically given as

Q=N*u

Where

mass of methanol is 32.04g/mol

molar heat of fusion of methanol is 3200J/mol

Therefore

number of moles in 25.7g

n=\frac{ 25.7g}{32.04}

n=0.8mol

Hence

the heat required to melt 25.7 g of solid methanol at its melting point is

Q=0.8*3.2

Q=2.6kJ

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The heat required to melt the compound is 2.56kJ.

Why?

To calculate the heat required to melt 25.7 g of solid methanol, we need to calculate its molar mass, know its chemical formula, its molar heat of fusion, and calculate how many moles represent 25.7g of the same compound.

Then, we need to use the following formula to calculate the heat:

Where,

N is the moles of the compound

u, is the molar heat of fusion of the compound (J/mol)

We know that the molar mass of methanol is :

So, we can calculate the number of moles that represents 25.7g of the same compound:

Also, the molar heat of fusion of methanol is:

Now, substituting into the first equation and calculating, we have:

Hence, we have that the heat required to melt the compound is 2.56kJ.

Have a nice day!

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.