Answer: To calculate the number of grams of magnesium chloride in 0.05 L of a 1.5% solution, we need to use the definition of a percentage solution.
A 1.5% solution means that there are 1.5 grams of magnesium chloride in 100 mL (or 0.1 L) of the solution. Therefore, the concentration of magnesium chloride is 1.5 grams per 100 mL.
Now, we can calculate the number of grams of magnesium chloride in 0.05 L (50 mL) of the solution:
1.5 grams / 100 mL = X grams / 50 mL
To find X (the number of grams of magnesium chloride in 0.05 L), we can use cross-multiplication:
X = (1.5 grams / 100 mL) * 50 mL
X = 0.75 grams
So, there are 0.75 grams of magnesium chloride in 0.05 L of the 1.5% solution.