Tính theo mẫu
100 g + 45 g – 26 g =
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163 g + 28 g = 191g
50 g x 2 = 100g
42 g – 25 g = 17g
96 g : 3 = 32g
100 g + 45 g – 26 g = 119g.
`@` `\text {Ans}`
`\downarrow`
`e)`
`1+(-4)+7+(-10)+13`
`= (-4 - 10) + (1 + 13) + 7`
`= -14+14 + 7`
`= 7`
`f)`
`-2+7+(-12)+17+(-22)`
`= (7 + 17) + (-12 - 22) - 2`
`= 24 - 34 - 2`
`= -10 - 2`
`= -12`
`g)`
`44+45+46+47-24-25-26-27`
`= (44 - 24) + (45 - 25) + (46 - 26) + (47 - 27)`
`= 20 + 20 + 20 + 20`
`= 20*4 = 80`
\(m_{K\left(theo.u\right)}=\dfrac{6476.10^{-26}}{0,16605.10^{-23}}\approx39\left(u\right)\)
G = 21 + 22 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 210
2.G = 22 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 210 + 211
2G - G = (22 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 210 + 211) - (21 + 22 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 210)
G = 22 + 23 + 24 +25 + 26 + 27 + 28 + 29 + 210 + 211 - 21 -22 -23 -24 - 25 - 26 - 27 - 28 - 29 - 210
G = (22 -22) +(23 - 23) + (24 - 24) + (25 -25) + (26 - 26) +(27 - 27) +(28 -28) + (29 - 29) + (210 - 210) + (211 - 21)
G = 211 - 2
G = 2048 - 2 (đpcm)
b,
G = 21 + 22 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 210
D = 2.(1+ 2 + 22 + 23 + 24 + 25 + 26 + 27 + 28 + 29)
Vì 2 ⋮ 2 nên D = 2.(1+2+22+23+24+25+26+27+28+29)⋮2 (đpcm)
\(1.n_C=\dfrac{16}{12}=1,33\left(mol\right)\\ 2.n_{Zn}=\dfrac{26}{65}=0,4\left(mol\right)\\ 3.n_{NaOH}=\dfrac{8}{40}=0,2\left(mol\right)\\ 4.n_P=\dfrac{12,4}{31}=0,4\left(mol\right)\\ 5.n_{HNO_3}=\dfrac{31,5}{63}=0,5\left(mol\right)\\ 6.n_{N_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ 7.n_{Cl_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\\ 8.n_{CO_2}=\dfrac{67,2}{22,4}=3\left(mol\right)\\ 9.n_{H_2}=\dfrac{35,84}{22,4}=1,6\left(mol\right)\\ 10.n_{O_2}=\dfrac{20,16}{22,4}=0,9\left(mol\right)\)
\(1,n_C=\dfrac{16}{12}\approx1,33(mol)\\ 2,n_{Zn}=\dfrac{26}{65}=0,4(mol)\\ 3,n_{NaOH}=\dfrac{8}{40}=0,2(mol)\\ 4,n_{P}=\dfrac{12,4}{31}=0,4(mol)\\ 5,n_{HNO_3}=\dfrac{31,5}{63}=0,5(mol)\\ 6,n_{N_2}=\dfrac{4,48}{22,4}=0,2(mol)\)
100 g + 45 g – 26 g = 119g