Question

Using the molecular masses, calculate the amount (in grams) of the chemicals required to make the following volumes of solutions (answer to two decimal places). Urea – 7M in 10mL

Answer 1

To calculate the amount of urea required to make a 7M solution in 10mL, we need to use its molecular mass and formula. The molecular mass of urea is 60.06 g/mol.

First, we need to calculate the number of moles of urea required:

Moles of urea = Molarity (M) × Volume (L)

= 7 mol/L × 0.010 L

= 0.07 mol

Next, we can convert the moles to grams using the molecular mass:

Mass of urea = Moles of urea × Molecular mass of urea

= 0.07 mol × 60.06 g/mol

= 4.20 grams

Therefore, to make a 7M solution of urea in 10mL, you would need approximately 4.20 grams of urea.

Step-by-step explanation:

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