“Phân tử khối bằng tổng khối lượng của các nguyên tửu trong phân tử”

A l 2 O 3  (M = 27.2 + 16.3 = 102 đvC )

A l 2 ( S O ₄ ) 3  (M = 342 đvC ) F e ( N O 3 ) 3  ( M = 242 đvC )

N a 3 P O 4  (M = 164 đvC ) C a ( H 2 P O 4 ) 2    ( M = 234 đvC )

B a 3 ( P O 4 ) 2    (M = 601 đvC ) Z n S O 4  ( M = 161 đvC )

AgCl (M = 143,5 đvC ) NaBr ( M = 103 đvC )

\(1,\left\{{}\begin{matrix}p=e\\n+p+e=40\\2p-n=12\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2p+n=40\\2p-n=12\end{matrix}\right.\Leftrightarrow n=\dfrac{40-12}{2}=14\)

\(2,PTK_{Al_2O_3}=2\cdot27+16\cdot3=102\left(đvC\right)\\ PTK_{Al_2\left(SO_4\right)_3}=2\cdot27+\left(32+16\cdot4\right)\cdot3=342\left(đvC\right)\\ PTK_{Fe\left(NO_3\right)_3}=56+\left(14+16\cdot3\right)\cdot3=242\left(đvV\right)\\ PTK_{Na_3PO_4}=23\cdot3+31+16\cdot4=164\left(đvC\right)\\ PTK_{Ca\left(H_2PO_4\right)_2}=40+\left(2+31+16\cdot4\right)\cdot2=234\left(đvC\right)\\ PTK_{Ba_3PO_4}=137\cdot3+31+16\cdot4=506\left(đvC\right)\\ PTK_{ZnSO_4}=65+32+16\cdot4=161\left(đvC\right)\\ PTK_{AgCl}=108+35,5=143,5\left(đvC\right)\\ PTK_{NaBr}=23+80=103\left(đvC\right)\)

Câu 1:

O: 6 e ngoài cùng

N: 4 e ngoài cùng

K:1 e ngoài cùng

P: 5 e ngoài cùng

Câu 2:

\(PTK_{Al_2O_3}=2.27+16.3=102\left(đVc\right)\)

Al₂(SO₄)₃=27.2+3.(32+16.4)=342(đVc)

\(Fe\left(NO_3\right)_3=56+3.\left(14+16.3\right)=242\left(đVc\right)\)

\(Na_3PO_4=23.3+31+16.4=164\left(đVc\right)\)

\(Ca\left(H_2PO_4\right)_2=40+2.\left(1.2+31+16.4\right)=234\left(đVc\right)\)

\(Ba_3\left(PO_4\right)_2=137.3+2.\left(31+16.4\right)=601\left(đVc\right)\)

\(ZnSO_4=65+32+16.4=161\left(đVc\right)\)

\(AgCl=108+35,5=143,5\left(đVc\right)\)

\(NaBr=23+80=103\left(đVc\right)\)

\(PTK_{Mg\left(OH\right)_2}=24+\left(16+1\right).2=58\left(đvC\right)\)

\(PTK_{Ca\left(H_2PO_4\right)_2}=40+\left(1.2+31+16.4\right).2=234\left(đvC\right)\)

\(PTK_{Ba_3\left(PO_4\right)_2}=137.3+\left(31+16.4\right).2=601\left(đvC\right)\)

\(PTK_{Al_2\left(SO_4\right)_3}=27.2+\left(32+16.4\right).3=342\left(đvC\right)\)

\(PTK_{Ca\left(HCO_3\right)_2}=40+\left(1+12+16.3\right).2=162\left(đvC\right)\)

\(PTK_{Fe\left(NO_3\right)_2}=56+\left(14+16.3\right).2=180\left(đvC\right)\)

\(PTK_{Mg\left(OH\right)_2}=24+\left(16+1\right)\cdot2=58\left(đvC\right)\\ PTK_{Ca\left(H_2PO_4\right)_2}=40+\left(2+31+16\cdot4\right)\cdot2=234\left(đvC\right)\\ PTK_{Ba_3\left(PO_4\right)_2}=137\cdot3+\left(31+16\cdot4\right)\cdot2=601\left(đvC\right)\\ PTK_{Al_2\left(SO_4\right)_3}=27\cdot2+\left(32+16\cdot4\right)\cdot3=342\left(đvC\right)\\ PTK_{Ca\left(HCO_3\right)_2}=40+\left(1+12+16\cdot3\right)\cdot2=162\left(đvC\right)\\ PTK_{Fe\left(NO_3\right)_2}=56+\left(14+16\cdot3\right)\cdot2=180\left(đvC\right)\)

gggggggggggggggggggggggggggggggggggggggggggnv

gggggggggggggggggggggggggggggggggggggggggggnv

\(a) n_{Zn(NO_3)_2} = \dfrac{37,8}{189} = 0,2(mol)\\ n_{Zn} = 0,2\ mol \to m_{Zn} = 0,2.65 = 13\ gam\\ n_N = 0,2.2 = 0,4\ mol \to m_N = 0,4.14 = 5,6\ gam\\ m_O = 37,5 - 13 - 5,6 = 18,9(gam)\\ b)n_{Fe_3(PO_4)_2} = \dfrac{10,74}{358} = 0,03(moL)\\ n_{Fe} = 0,03.3 = 0,09 \to m_{Fe} = 0,09.56 = 5,04(gam)\\ n_P = 0,03.2 = 0,06 \to m_P = 0,06.31 = 1,86(gam)\\ m_O = 10,74 - 5,04 -1,86 = 3,84(gam)\\ c) n_{Al} = 0,2.2 = 0,4(mol\to m_{Al} = 0,4.27 = 10,8(gam)\\ n_S = 0,2.3 = 0,6 \to m_S = 0,6.32 = 19,2(gam)\\ n_O = 0,2.12 = 2,4 \to m_O = 2,4.16 = 38,4(gam)\)

\(d) n_{Zn(NO_3)_2} = \dfrac{6.10^{20}}{6.10^{23}} = 0,001(mol)\\ n_{Zn} = 0,001 \to m_{Zn} = 0,001.65 = 0,065(gam)\\ n_N = 0,001.2 = 0,002 \to m_N = 0,002.14 = 0,028(gam)\\ n_O = 0,001.6 = 0,006 \to m_O = 0,006.16= 0,096(gam)\)

Theo gt ta có: $n_{Zn(NO_3)_2}=0,2(mol);n_{Fe_3(PO_4)_2}=0,03(mol);n_{Zn(NO_3)_2}=1(mol)$

a, $m_{Zn}=13(g);m_{N}=5,6(g);m_{O}=19,2(g)$

b, $m_{Fe}=5,04(g);m_{P}=1,86(g)$;m_{O}=3,84(g)$

c, $m_{Al}=10,8(g);m_{S}=19,2(g);m_{O}=38,4(g)$

d, $m_{Zn}=65(g);m_{N}=28(g);m_{O}=96(g)$