# Answer in General Chemistry for Kristelle Belleza #153608

An aqueous solution is 6.00 % methanol CH3OH by mass with a density = 0.988 g/mL. What is the molarity of CH3OH in this solution?

To calculate molarity we need to first find the number of moles present.

Mass % of methanol CH3OH is 6%

That means for every 100g of solution ther are 6g of CH3OH

Molar mass of CH3OH = 12 + (4×1) + 16 = 32g/mol

Moles of CH3OH in 6g = “dfrac{mass}{Molar Mass} = dfrac{6g}{32g/mol} = 0.1875mol” of CH3OH

Now we need to finde the volume of solution

Density = 0.988g/mL

Mass of solution is 100g

Volume = “dfrac{mass}{density} = dfrac{100g}{0.988g/mL} = 101.2146mL”

0.187moles are in 101.2146mL

? moles will be in 1000mL of solution

Molarity = “dfrac{0.187mol x 1000mL}{101.2146mL} = 1.848M” CH3OH

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