Question

A student measures 1.5815 g of a mixture of sand and sodium carbonate, which is later determined to be 30.81% sand. what mass of na2co3 was in the original mixture?

Answer 1

To find the mass of Na2CO3 in the original mixture, calculate the mass of sand and subtract it from the total mass.

Step-by-step explanation:

To find the mass of Na2CO3 in the original mixture, we need to calculate the mass of sand in the mixture and subtract it from the total mass of the mixture. We are given that the mixture is 30.81% sand, so the mass of sand can be calculated as:

Mass of sand = 30.81% * Total mass of mixture = 30.81% * 1.5815 g = 0.486 g

Now, to find the mass of Na2CO3, we subtract the mass of sand from the total mass of the mixture:

Mass of Na2CO3 = Total mass of mixture - Mass of sand = 1.5815 g - 0.486 g = 1.0955 g