Đáp án:
Giải thích các bước giải:
*Cách tính khối lượng :
m= n.M
-m : khối lượng của chất
-n : số mol chất
-M : khối lượng mol
Bài giải :
Khối lượng của `Fe_2 O _3` là :
0,14 . ( 56.2 + 16.3) = 22,4 g
Khối lượng của `S` là :
0,36 . 32 = 11,52 g
Khối lượng của `C` là :
0,12 . 12 =1,44 g
Khối lượng của hỗn hợp A là :
22,4 + 11,52 + 1,44 = 35,36 g
@kngocc
Ta có :
`m_(Fe_2O_3)=0,14.(56.2+16.3)=22,4 \ \ text{(g)}`
`m_S=0,36.32=11,52 \ \ text{(g)}`
`m_C=0,12.12=1,44 \ \ text{(g)}`
`to m_(hh \ A)=22,4+11,52+1,44=35,36 \ \ text{(g)}`
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Tìm giá trị nhỏ nhất của biểu thức: 9x^2+y^2-6x+5
Mọi người giải hộ mình nhanh với
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