Answer:
Step-by-step explanation:
To find the mass fraction of a solute in a solution, you need to divide the mass of the solute by the total mass of the solution. Let's calculate the mass fractions for each scenario:
1. For 1.500ml alcohol and 1L water:
First, convert the volumes to grams by using the density of alcohol (0.789 g/ml) and water (1 g/ml). The mass of alcohol is 1.500 ml * 0.789 g/ml = 1.1845 g, and the mass of water is 1 L * 1 g/ml = 1000 g.
Next, divide the mass of alcohol (1.1845 g) by the total mass of the solution (1.1845 g + 1000 g) = 1.1845 g / 1001.1845 g = 0.001183 or approximately 0.1183%.
2. For 300g rice grains and 540ml water:
In this case, we already have the mass of the solute (rice grains) and the solvent (water).
Divide the mass of rice grains (300 g) by the total mass of the solution (300 g + 540 ml * 1 g/ml = 840 g).
So, the mass fraction of rice grains is 300 g / 840 g = 0.3571 or approximately 35.71%.
3. For 450g sugar and 360ml coconut milk:
Again, we have the mass of the solute (sugar) and the solvent (coconut milk).
Divide the mass of sugar (450 g) by the total mass of the solution (450 g + 360 ml * 0.960 g/ml = 810.96 g).
Thus, the mass fraction of sugar is 450 g / 810.96 g = 0.5548 or approximately 55.48%.
Remember, the mass fraction represents the proportion of the solute's mass to the total mass of the solution. It is expressed as a decimal or percentage.