Answer to Question #138457 in Organic Chemistry for emily

Question

A solution is made containing 14.8 g of CH3OH in 186 g H2O. Calculate the mass percent of CH3OH.

Answer 1

As we know that

total mass of solution (m_total) = weight or mass of H₂O (m_H2O) + weight or mass of CH₃OH (m_CH3OH)

total mass of solution (m_total) =  186 g + 14.8 g

total mass of solution (m_total) = 200.8 g

Also we know that

mass percent of CH₃OH (%) = weight or mass of CH₃OH (m_CH3OH)  100 / total mass of solution (m_total)

mass percent of CH₃OH (%) = 14.8 g  100 / 200.8 g

mass percent of CH₃OH (%) = 1480 / 200.8

mass percent of CH₃OH (%) = 7.371 % ( i.e the answer)