Question

10. Calculate the molecular weights of the following

(i) CuSO4.5H2O​

Answer 1

Answer:

The molecular weight is 249.5g

Answer 2

:Answer: 249.5 g.

Explanation :Molecular mass is considered the total sum of the masses of the atoms or elements included in the molecule. By interpreting the substance provided, we can calculate the molecular mass of the molecule:

Identify the molecule formula

The number of atoms presents in each element of the compound is calculated using the formula.

Multiply the atomic weight of each element with the number of atoms of that particular element

Likewise, do it for all the elements in the compound

Add all the values obtained in the step above

Then add the unit as grams/mole, and you can find the molecular mass of the compound

Molecular mass of CuSO4. 5 H2O

The atomic mass of H is 1 g

The atomic mass of O is 16 g

The atomic mass of Cu is 63.5 g

The atomic mass of S is 32 g

Molar mass of CuSO4. 5 H2O = Atomic mass of Cu + Atom mass of S + (4 × Atomic mass of O) + [5 × {2 × Atomic mass of H + Atomic mass of O}]

Molar mass of CuSO4. 5 H2O = 63.5 + 32 + (4 × 16) + 5 (2 + 16) g

Molar mass of CuSO4. 5 H2O = 63.5 + 32 + 64 + 90 g

Molar mass of CuSO4. 5 H2O = 249.5 g

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