1/NaNO3
\(\%Na=\dfrac{23.100}{83}=27,7\%\)
\(\%N=\dfrac{12.100}{83}=14,6\%\)
\(\%O=100-27,7-14,6=57,7\%\)
2/H2SO4
\(\%H=\dfrac{2.100}{98}=2\%\)
\(\%S=\dfrac{32.100}{98}=32,7\%\)
\(\%O=100-2-32,7=65,3\%\)
3/CaCO3
\(\%Ca=\dfrac{40.100}{100}=40\%\)
\(\%C=\dfrac{12.100}{100}=12\%\)
\(\%O=\dfrac{16.3.100}{100}=48\%\)
4/K2CO3
\(\%K=\dfrac{39.2.100}{138}=56,5\%\)
\(\%C=\dfrac{12.100}{138}=8,7\%\)
\(\%O=100-56,5-8,7=34,8\%\)
5/KClO3
\(\%K=\dfrac{39.100}{122,5}=31,8\%\)
\(\%Cl=\dfrac{35,5.100}{122,5}=29\%\)
\(\%O=100-31,8-29=39,2\%\)
6/Mg(OH)2
\(\%Mg=\dfrac{24.100}{58}=41,4\%\)
\(\%O=\dfrac{16.2.100}{58}=55,2\%\)
\(\%H=100-41,4-55,2=3,4\%\)
7/K3PO4
\(\%K=\dfrac{39.3.100}{212}=55,2\%\)
\(\%P=\dfrac{31.100}{212}=14,6\%\)
\(\%O=100-55,2-14,6=30,2\%\)
8/C6H12O6
\(\%C=\dfrac{12.6.100}{180}=40\%\)
\(\%H=\dfrac{1.12.100}{180}=6,7\%\)
\(\%O=100-40-6,7=53,3\%\)
9/Ba(OH)2
\(\%Ba=\dfrac{137.100}{171}=80,1\%\)
\(\%O=\dfrac{16.2.100}{171}=18,7\%\)
\(\%H=100-80,1-18,7=1,2\%\)
10/Fe2(SO4)3
\(\%Fe=\dfrac{56.2.100}{400}=28\%\)
\(\%S=\dfrac{32.3.100}{400}=24\%\)
\(\%O=100-28-24=48\%\)
mình không có ý gì nhưng mốt bạn đăng ít câu thôi , ngta giải nhìn ngán lắm ý==''
