Answer to Question #151158 in General Chemistry for sewar

Question

. Calculate the number of moles of each compound
a. 5.26 ng NH4C:l (53.5)
b. 12.78µg strontium nitrate: Sr(ClO3)2 :(255)
c. 6.89 mg Li2CrO4 :(130)

Answer 1

a. Mole = mass/molar mass = (5.26 × 10^-9 )/ 53.5 = 98.32 × 10^-12 mole

b. Mole = mass / molar mass = (12.78 × 10^-6) / 255 = 5.01 × 10^-8 mole

c. Mole = mass/ molar mass = (6.89 × 10^-3 ) / 130 = 0.000053 mole