Answer:
0.2 M is the concentration of the resulting solution
Explanation:
M is a unit for concentration which means mole of solute in 1L of solution.
According to the received information, we have 4 g in 500 mL of solution.
In 0.5L we have 4 g of solute
In 1L we have (1 .4)/0.5 = 8 g of solute
Let's convert the mass in mole
Mass / Molar mass = Mole
Molar mass NaOH = 40 g/m
8g / 40 g/m = 0.2M
Answer:
Concentration in molarity is 2 M.
Explanation:
Mass of NaOH dissolved = 4 g
Molar mass of NaOH = 40 g/mol
Number of moles = [tex]\frac{Given\ mass}{molar\ mass}=\frac{4}{40}=0.1\ mol[/tex]
Concentration is usually expressed in terms of molarity.
Molarity is defined as number of moles of solute per litre of solution.
Molarity = [tex]\frac{Number\ of\ moles\ of\ solute}{Volume\ of\ solution\ in\ L}[/tex]
=[tex]\frac{0.1\times1000}{500}=0.2\ M[/tex]
Hence concentration of the solution is 2 M.
