Question

Determine the mass in grams of each of the following:

a) 2.3 moles of KCl (molar mass = 74.55 g/mol)

b) 0.5 moles of Mg(NO3)2 (molar mass = 148.32 g/mol)

c) 3 moles of N2 (molar mass = 28.02 g/mol)

d) 1.8 moles of C8H18 (molar mass = 114.22 g/mol)

Answer 1

The mass in grams of 2.3 moles of KCl is 171.465 g, of 0.5 moles of Mg(NO3)2 is 74.16 g, of 3 moles of N2 is 84.06 g, and of 1.8 moles of C8H18 is 205.596 g.

Step-by-step explanation:

To determine the mass in grams of a given number of moles of a substance, we use the molar mass of the substance. The molar mass is the mass of one mole of the substance, expressed in grams per mole (g/mol). Here are the calculations for each substance:

KCl (Molar mass = 74.55 g/mol): Mass = moles × molar mass = 2.3 moles × 74.55 g/mol = 171.465 g

Mg(NO3)2 (Molar mass = 148.32 g/mol): Mass = moles × molar mass = 0.5 moles × 148.32 g/mol = 74.16 g

N2 (Molar mass = 28.02 g/mol): Mass = moles × molar mass = 3 moles × 28.02 g/mol = 84.06 g

C8H18 (Molar mass = 114.22 g/mol): Mass = moles × molar mass = 1.8 moles × 114.22 g/mol = 205.596 g