1)
mass(NaCl)= 23.4 g
V(H2O) = 250.0 mL
use:
(m/v)% = mass of NaCl *100 / volume of H2O in mL
= 23.4*100/250.0
= 9.36 %
Answer: 9.36 %
2)
volume , V = 1.5*10^3 mL
= 1.5 L
use:
number of mol,
n = Molarity * Volume
= 0.2*1.5
= 0.3 mol
Molar mass of NaOH,
MM = 1*MM(Na) + 1*MM(O) + 1*MM(H)
= 1*22.99 + 1*16.0 + 1*1.008
= 39.998 g/mol
use:
mass of NaOH,
m = number of mol * molar mass
= 0.3 mol * 40 g/mol
= 12 g
Answer: 12 g
Only 1 question at a time please
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