Question

FOARTEEE URGENTTT !!! 1,2,3!!!!!! Va rog!!!

Answer 1

Răspuns:

1.

ms=25g

md= 1,5g

C  = md x 100 /ms = 1,5 x 100 / 25 = 6 %

2.

ms1 = 100g    C1 = 10% ⇒ md1 = 0,1×100 = 10 g

ms2 = 300g    c2 = 15%  ⇒  md2 = 0,15×300 = 45g

.........................................................................................

msf = ms1 + ms2 = 400g      mdf = md1 + md2 = 55g

C = 55·100/400 = 13,75%

3.

MH2O=2×1+16=18g/mol

mH2O=m×M=20*18=360g

MCuSO4=64+32+4×16=160g/mol

mCuSO4=0,5*160=80g

MCuSO4×5H2O=64+32+4×16+5×(2×1+16)=250g

mapatotal=mapa+m1apa=360+90=450g

mCuSO4total=mCuSO4 + m1CuSO4=80+160=240g

md=mCuSO4total=240g

ms=mCuSO4total + mapatotal=240+450=690g

C=md×100/ms=240×100/690=34,78%

6%, 13,75%, 34,78%

Explicație:

n=m/M

C=md×100/ms