Question

How many grams of sucrose of molecular weight 342g would you need to make 500ml of a 5mmol/l solution?

Answer 1

To calculate the number of grams of sucrose required to make a 5 mmol/L solution in a 500 mL volume, we need to convert the given molarity (mmol/L) to moles and then determine the mass of sucrose using its molar mass. Here's how you can calculate it:

1. Convert molarity to moles: 5 mmol/L × 500 mL = 2500 mmol

2. Convert mmol to moles: 2500 mmol ÷ 1000 = 2.5 moles

3. Calculate the mass of sucrose: Mass = moles × molar mass

Mass = 2.5 moles × 342 g/mol = 855 grams

Therefore, you would need approximately 855 grams of sucrose (with a molar mass of 342 g/mol) to make a 500 mL solution with a concentration of 5 mmol/L.