Question

The number of grams in 2.56 x 1025 molecules of HCl are

Answer 1

1569.5g

Step-by-step explanation:

Given parameters:

Number of molecules = 2.56 x 10²⁵

Unknown:

Mass of HCl = ?

Solution:

To solve this problem, let us find the number of moles first;

Number of moles =
`(number of particles)/(2.56 x 10^(25) )`

So,

Number of moles =
`(2.56 x 10^(25) )/(6.02 x 10^(23) )` = 0.43 x 10² = 43mol

Now;

Mass of HCl = number of moles x molar mass

Molar mass of HCl = 1 + 35.5 = 36.5g/mol

Mass of HCl = 43 x 36.5 = 1569.5g