Question

Calculate the number of formula units in 1.87 mol of NH4Cl

a. 1.13 x 1024 NH4Cl
b. 6.75 x 1024 NH4Cl
c. 1.12 x 1024 NH4Cl

Answer 1

1.13 x 10²⁴formula units

Step-by-step explanation:

Given parameters:

Number of moles of NH₄Cl = 1.87mol

Unknown:

Number of formula units = ?

Solution:

From mole concept;

1 mole of a substance contains 6.02 x 10²³ formula units

Now;

1.87 moles of NH₄Cl 1.87 x 6.02 x 10²³ = 1.13 x 10²⁴formula units