Kết quả tìm kiếm

CaCo3->CaO+CO2 0,0045....0,0045 mCaCo3=0,5.90/100=0,45tấn=>nCaCo3=0,45/100=0,0045mol mCaO tho pt=0,0045.56=0,252tấn Nếu hiệu suất phản ứng đạt 85% thì khối lượng vôi sống thu được là: mCaO thu được=0,252.85/100=0,2142tấn

1. 2R+nCl2->2RCln .......71n....2R+71n ........1,5975..3,06 nCl2=0,0225mol=>mCl2=1,5975g Có 1,5975.(2R+71n)=3,06.71n 3,195R+113,4225n=217,26n 3,195R=103,8375n R=32,5n Biện luận n=2, R=65(Zn) Vậy R là Zn

1d 2a 3b 1b 2d 1c 2b 1 traditional 2 convenient 3 unmodern 4 inspiration 5 equality 6 encouragement 7 embroidered 8 fashionable 9 pride 10 economic 1 have had 2 have been living 3 went 4 had stayed 5 have't been 6 has been 7 have worked 8 moved, have been 9 have already gone 10 was wearing...

NaOH+HCl->NaCl+H2O x............x.......x KOH+HCl->KCl+H2O y.........y........y 40x+56y=3,04 58,5x+74,5y=4,15 =>x=0,02;y=0,04 mNaOH=40.0,02=0,8g mKOH=3,04-0,8=2,24g

về oxit axit tác dụng với kiềm hay sao bạn

Chid động từ 1. sing 2. Being 3. Lying, to watch

Câu 4 phải là feel chứ

Can we be friends?

Fe+CuSO4->FeSO4+Cu x.....x..............x...........x Gọi x là số mol Fe pứ Có 64x-56x=0,4=>x=0,05 mFe pứ=56.0,05=2,8g mCuSO4=160.0,05=8g V Dd CuSO4=210/1,05=200ml=0,2l CM dd CuSO4=0,05/0,2=0,25M

Fe+2HCl->FeCl2+H2 0,1..0,2......0,1......0,1 Lập tỉ lệ nFe=nHCl(1:1). Ko có chất dư VH2(₫ktc)=0,1.22,4=2,24(l) FeCl2+2AgNO3->2AgCl+Fe(NO3)2 0,1........................0,2 mAgCl=0,2.143,5=28,7g

NaAlO2+H20->Al(OH)3+NaOH 2Al+2NaOH+2H20->2NaAlO2+3H2 Al(OH)3+NaOH->NaAlO2+H20 2Al+Ba(OH)2+2H20->Ba(AlO2)2+2H20 Al2O3+Ba(OH)2->Ba(AlO2)2+H20 2Al(OH)3+Ba(OH)2->Ba(AlO2)2+4H20 Al2S3+6H20->2Al(OH)3+3H2S

Được giải 3 kià Thư!

1. The weather is hot enough for children to go swimming. 2. This story is amusing enough to make all people laugh 3. This exercise isn't easy enough for him to do.

1.C 2B 3B 4D 5B

Thay vì đăng bài cảm ơn (vi phạm nội quy) thì anh like cho em là được rồi!

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Mình ko chắc lắm CMdd HCl=0,3/0,3=1M D dd HCl=mdd/Vdd(ml)

mHCl=6,72/22,4.36,5=10,95g mdd HCl=10,95+80,05=91g C%dd HCl=10,95/91.100%=12,03%

1. Fe+CuSO4->FeSO4+Cu x.....x.............x..... ......x Gọi x lă số mol Fe pứ 64x-56x=4.50/100=>x=0,25 CM dd CuSO4=0,25/0,5=0,5M 2. A2SO4+BaCl2->2ACl+BaSO4 BSO4+BaCl2->BCl2+BaSO4 nBaSO4=69,9/233=0,3mol nBaCl2=nBaSO4=0,3mol=>mBaCl2=62,4g mmuối=44,2+62,4-69,9=37g 3. A2O3+6HCl->2ACl3+3H2O...

."I have something to tell you" Mary said to john A.Mary told John I had some thing to tell him B.Mary told John she had something to tell him C.Mary told John she had had something to tell him D.Mary told John he had had somthing to tell her 2.He said, " My wife has just bought a diamind ring"...