The sodium hydroxide solution in this investigation contains 80 grams per dm^3 the students use 40cm^3 of sodium hydroxide solution. calculate the mass of sodium hydroxide in 40cm^3

The mass of sodium hydroxide in 80 grams per 40 cm^3 is calculated as follows

we well know 1 dm^3 = 1000cm^3

if 80grams is in 1000Cm^3

what about 40 cm^3

by cross multiplication

40 cm^3 x80 grams / 1000cm^3 = 3.2 grams