Răspuns :
1.
[tex]m_{H_2O}=500\ g \\ m_{sare}=10\ g \\ \\ C=\frac{m_d}{m_s}*100=\frac{10*100}{510}=1,96\% [/tex]
2.
[tex]m_s=1300\ g \\ C=10\% \\ \\ m_d=\frac{m_s*C}{100}=\frac{1300*10}{100}=130\ g[/tex]
3.
[tex]m_s=5600\ g \\ C=10\% \\ m_{H_2O}=5600g \\ \\ m_{d_i}=\frac{5600*10}{100}=560\ g \\ \\ m_{s_f}=560+5600=6160\ g \\ \\ C_f=\frac{560*100}{6160}=9,09\%[/tex]
[tex]m_{H_2O}=500\ g \\ m_{sare}=10\ g \\ \\ C=\frac{m_d}{m_s}*100=\frac{10*100}{510}=1,96\% [/tex]
2.
[tex]m_s=1300\ g \\ C=10\% \\ \\ m_d=\frac{m_s*C}{100}=\frac{1300*10}{100}=130\ g[/tex]
3.
[tex]m_s=5600\ g \\ C=10\% \\ m_{H_2O}=5600g \\ \\ m_{d_i}=\frac{5600*10}{100}=560\ g \\ \\ m_{s_f}=560+5600=6160\ g \\ \\ C_f=\frac{560*100}{6160}=9,09\%[/tex]
1)Se da:
m(H2O)=500 g
m(NaCl)=10 g
-----------------------------
W(partea de masa)-?
Rezolvare:
W=md/ms *100%
ms=m(H2O)+md=500 g+10 g=510 g
W=10/510 *100%=1,96 %
Raspuns:W=1,96 %
2)Se da:
ms=1300 g
W=10 %
--------------------------
m(NaCl)-?
Rezolvare:
m(NaCl)=W*ms /100 % =10% * 1300g /100g=130 g
Raspuns:m(NaCl)=130g
3)Se da:
ms=5600 g
W1=10%
m(H2O)=5600 g
-----------------------------
W2-?
Rezolvare:
md=10%*5600g /100%=560g
msf=560+5600=6160
W2=560/6160 *100%=9,09%
Raspuns:W2=9,09%
m(H2O)=500 g
m(NaCl)=10 g
-----------------------------
W(partea de masa)-?
Rezolvare:
W=md/ms *100%
ms=m(H2O)+md=500 g+10 g=510 g
W=10/510 *100%=1,96 %
Raspuns:W=1,96 %
2)Se da:
ms=1300 g
W=10 %
--------------------------
m(NaCl)-?
Rezolvare:
m(NaCl)=W*ms /100 % =10% * 1300g /100g=130 g
Raspuns:m(NaCl)=130g
3)Se da:
ms=5600 g
W1=10%
m(H2O)=5600 g
-----------------------------
W2-?
Rezolvare:
md=10%*5600g /100%=560g
msf=560+5600=6160
W2=560/6160 *100%=9,09%
Raspuns:W2=9,09%