Question

The active mass of 80g NaOh in 8 litre flask is ?a)1.0. B) 0.75 c)0.5 d)0.25

Answer 1

Answer:

0.75 is Option B answer I am sure

Answer 2

Answer:

Option d) 0.25

Explanation:

Molar Mass of NaOH = 23 + 16 + 1 = 40g/mol

Mass of NaOH from the question = 80g

Number of mole = Mass/Molar Mass

Number of mole of NaOH = 80/40 = 2moles

Volume = 8L

Active mass = mole /Volume

Active mass = 2moles/8L

Active mass = 0.25mol/L