Question

The neurotransmitter acetylcholine has the molecular formula of C7NH16O2+. If you wanted to make a 100mL solution of 10mM, how many grams of acetylcholine do you need to weigh?

Answer 1

Answer:

0.146 g

Explanation:

Given data:

Volume of solution = 100 mL

Molarity = 10 mM

Molecular formula = C₇NH₁₆O₂

Mass of  C₇NH₁₆O₂ needed = ?

Solution:

First of all we will convert the mM into M and mL to litter.

Volume of solution = 100 mL

Volume of solution = 100 / 1000 = 0. 1 L

Molarity = 10 mM

Molarity = 10 / 1000 = 0.01 M

Molar mass of  C₇NH₁₆O₂ = 146.21 g/mol

For 1M solution we dissolve 146.21 g/mol in one litter

For 0.01 M

146.21 g/mol × 0.01 mol/ L = 1.4624 g/L

while we have to make 0.1 L solution,

1.4624 g/L ×0.1 L = 0.146 g