Question

Cine ma poate ajuta cu aceasta fisa? Sunt praf la chimie.. daca cineva stie sa rezolve aceasta foaie , dau 50 de puncte. Multumesc frumos.

Answer 1

1. n NaCl = ?
Vs = 1L
C = 2M

C = md/M*Vs(L) => md = C*M*Vs = 2*58,5*1 = 117g NaCl

n = md/M = 117/58,5 = 2 moli NaCl

M NaCl = 58,5g/mol

2. Vs = ?
C = 0,5M
md = 80g NaOH

C = md/M*Vs => Vs = md/(C*M) = 80/(0,5*40) = 4L sol. NaOH

MNaOH = 40g/mol

3. md = 322g CuSO4
V H2O = 10L

MCuSO4 = 160g/mol

C = md/M*Vs = 322/(160*10) = 0,20125 M