Answer:
62.73g
Explanation:
Using the following formula;
Molarity = n/V
Where;
n = number of moles (mol)
V = volume (L)
From the information given below,
V = 230mL = 230/1000 = 0.230L
M = 3.21 M
3.21 = n/0.230
n = 3.21 × 0.230
n = 0.738 mol of KNO2
Molar mass of KNO2 = 39 + 14 + 16(2)
= 53 + 32
= 85g/mol
mole = mass/molar mass
0.738 mol = mass/85g/mol
Mass = 0.738 × 85
mass = 62.73g
