Hi!
To determine the percentage of water in the soil sample, we need to calculate the mass of water lost during heating. We can do this by subtracting the mass of the crucible and soil after heating from the mass of the crucible and soil before heating:
Mass of soil = (Mass of crucible and soil before heating) - (Mass of crucible and soil after heating)
Mass of soil = 28g - 18g
Mass of soil = 10g
Therefore, the mass of soil in the crucible is 10g.
To determine the mass of water lost during heating, we can subtract the mass of the dry soil from the initial mass of the soil:
Mass of water lost = (Mass of crucible and soil before heating) - (Mass of crucible after heating)
Mass of water lost = 28g - 18g
Mass of water lost = 10g
Therefore, 10g of water was lost during heating.
To calculate the percentage of water in the soil sample, we can use the following formula:
Percentage of water = (Mass of water lost / Mass of soil) x 100%
Percentage of water = (10g / 28g) x 100%
Percentage of water = 35.7%
Therefore, the percentage of water in the soil sample is 35.7%.
Hope this Helps!