Answer:
7.3125grams
Step-by-step explanation:
Molarity is the measure of the molar concentration of a solution. It can be calculated using the formula as follows:
Molarity = number of moles (n) ÷ volume (V)
Based on the information given,
Molarity = 1.25 M
Volume = 100 mL = 100/1000 = 0.1 L
Molarity = n/V
1.25 = n/0.1
n = 1.25 × 0.1
n = 0.125mol
Using the below formula to calculate the mass of NaCl;
mole = mass/molar mass
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
0.125 = mass/58.5
mass = 0.125 × 58.5
mass = 7.3125 grams