Question

How many molecules are in 25 g of HCI? Thank you :)

Answer 1

4.13E23 molecules

Explanation:

Molar mass HCl = 36.4611 g/mol

25.0g = 25/36.4611 = 0.686 mol HCl

1 mol HCl = 6.022*10^23 molecules

0.686 mol = 0.686*6.022*10^23 = 4.13*10^23 molecules.

Answer 2

4.123 × 10²³ molecules

Explanation:

To calculate the number of molecules first find the number of moles then multiply it by 6.02×10^23

number of moles(n) = mass / molar mass (M)

M of HCl = 1 + 35. 5 = 36.5g/mol

n = 25/36.5 = 0.6849mol

next we use the formula

N = n × L

N = number of entities

n = number of moles

L = Avogadro's constant 6.02 × 10^23 entities

Number of HCl molecules is

0.6849 × 6.02 × 10^23

`4.123 * {10}^(23) molecules`

Hope this helps you