Determine the mass of NaOH needed to make 750.0mL of a 6.00 M solution of NaOH

Answer: 180g

Explanation:

No of moles = volume * molarity/1000

Volume is given as 750ml

Molarity is given as 6M

Substitute to get the mole

No of moles = 750*6/1000

No of moles = 4.5moles

Remember that

No of moles also = mass given/molar mass

Molar mass of NaOH

Na = 23

O=16

H=1

Molar mass = na + o+h

Molar mass = 23+16+1

Molar mass=40g/mol

Substitute

No of moles = mass given/molar mass

Mass = 4.5*40

Mass = 180g

The mass of NaOH needed is 180g