Answer:
10.26 M
Explanation:
The definition of molarity is moles per liter. Since we are given the mass, we first convert it into moles. Then, we divide by the amount of liters. A common way to solve the problem is through dimensional analysis. In it, you multiply all the numbers on top and divide by the numbers in the bottom.
150g | mol | | 1000 mL
------------------------------------------------------------------------ = 10.26 M
| 58.5 g | 250 mL | 1 L
This is the same as 150 * 1000 / (58.5 * 250) = 10.26M.
You can double check that you get the correct units by crossing out the same units on top and bottom. At the end, you should be left with a mol on top and L in the bottom. mol/L = molarity (M).
