Calculation of moles of HCl

Given, mass of HCl = 7.3 g
Molecular weight of HCl = 36.5 g/mol (1 mole of HCl contains 36.5 g of HCl)
Using the formula, number of moles = mass/molecular weight
Number of moles of HCl = 7.3 g / 36.5 g/mol = 0.2 mol

Therefore, the correct option is D) 0.2.

Explanation

In chemistry, the mole is a unit to measure the amount of a substance. It is defined as the amount of a substance that contains the same number of particles as there are atoms in 12 grams of carbon-12. The mole is represented by the symbol 'mol.'

To calculate the number of moles of a substance, we need to know the mass of the substance and its molecular weight. The molecular weight is the sum of the atomic weights of all the atoms in a molecule. For example, the molecular weight of HCl is 1 (atomic weight of hydrogen) + 35.5 (atomic weight of chlorine) = 36.5 g/mol.

In this question, we are given the mass of HCl as 7.3 g. We can use the formula, number of moles = mass/molecular weight, to calculate the number of moles of HCl. Substituting the values, we get:

Number of moles of HCl = 7.3 g / 36.5 g/mol = 0.2 mol

Therefore, the correct option is D) 0.2.

Conclusion

The number of moles present in 7.3 g of HCl is 0.2 mol. It is important to understand the concept of moles and how to calculate them as it is a fundamental concept in chemistry.

HEY MATEE!!!!!!!!! HERE IS UR ANS.... MOLAR MASS OF HCL=36.5Therefore no. of moles=7.3/36.5=0.2