Question

Bài 3 Tính % a)Cu SO4 b) Ca (NO3) c)Al2(SO4)²3

Answer 1

`a,`

\(K.L.P.T_{CuSO_{\text{4}}}=64+32+16.4=160< amu>.\)

\(\%Cu=\dfrac{64.100}{160}=40\%\)

\(\%S=\dfrac{32.100}{160}=20\%\)

\(\%O=100\%-40\%-20\%=40\%\)

`b,` \(K.L.P.T_{Ca\left(NO_3\right)}=40+14+16.3=102< amu>.\)

\(\%Ca=\dfrac{40.100}{102}\approx39,22\%\)

\(\%N=\dfrac{14.100}{102}\approx13,73\%\)

\(\%O=100\%-39,22\%-13,73\%=47,05\%\)

`c,` (bạn sửa lại đề: CTHH là `Al_2(SO_4)_3`)

\(K.L.P.T_{Al_2\left(SO_4\right)_3}=27.2+\left(32+16.4\right).3=342< amu>.\)

\(\%Al=\dfrac{27.2.100}{342}\approx15,79\%\)

\(\%S=\dfrac{32.3.100}{342}\approx28,07\%\)

\(\%O=100\%-15,79\%-28,07\%=56,04\%\)