Question

how many molecules are contained in each of the following? a. 1.35 mol carbon disulfide b. 0.254 mol as2o3 c. 1.25 mol water d. 150.0 mol hcl

Answer 1

(Rounded to SigFigs)

A. 8.14 * 10^23 Molecules CS2

B. 1.53 * 10^23 Molecules As2O3

C. 7.53 * 10^23 Molecules H2O

D. 9.0 * 10^25 Molecules HCl

Step-by-step explanation:

To determine the number of molecules in a given amount of substance (in moles), you can use Avogadro's number, which is approximately 6.022 × 10^23 molecules/mol.

a. 1.35 mol carbon disulfide:

Number of molecules = 1.35 mol × (6.022 × 10^23 molecules/mol) = 8.1437 × 10^23 molecules

b. 0.254 mol As2O3:

Number of molecules = 0.254 mol × (6.022 × 10^23 molecules/mol) = 1.530988 × 10^23 molecules

c. 1.25 mol water:

Number of molecules = 1.25 mol × (6.022 × 10^23 molecules/mol) = 7.5275 × 10^23 molecules

d. 150.0 mol HCl:

Number of molecules = 150.0 mol × (6.022 × 10^23 molecules/mol) = 9.033 × 10^25 molecules

In the image attached, you can see how Mols cancels out and you're left in molecules instead using the train track method.

Hope this helps!