Gọi công thức oxit là: R2On
R2On + nH2SO4 -> R2(SO4)n + nH2O
0.02/n <- 0.02
=> M R2On = 1.12/0.02/n = 56n
=> 2R + 16n = 56n
=> R = 20n
n = 1, R = 20 loại.
n =2, R = 40 (Canxi)
n=3, R = 60 loại
vậy công thức oxit là CaO.
Mn làm chi tiết và ko chép mạng nhe. Đúng mik vote 5 sao nha. Cammon cac ban
GIÚP !!!!!!!!!!!!!!!!!!!!!!!!!!!!:))))))))))))))))))))))))))))))))
Giải phương trình lượng giác
l) (6 × 8 – 48) : (10 + 11 + 12 + 13 + 14 + 15)
Giải cho mình hết 3 bài này, gấp ạ
So sánh: `√22` và `√27` `11` và `√121` `7` và `√50` `6` và `√33`
Giứp tớ với! Thank you!!! :>>>>>>>>>
Once a month, my parents take me to a lovely place on the (1) …………of the city. It is called Bat Trang village. I always look forward to the (2) ………… The village is famous (3) …………beautiful pieces of pottery. It is located in an area rich in (4) …………, the village has advantage of ingredients to create fine ceramics. Bat Trang ceramics are produced for daily (5) ………… use (bow, cup, plates, pot, bottle…), worshipping, or decoration purposes. Visiting Bat Trang, tourists can take a walk or join a buffalo tour for sightseeing and shopping. I am not an exception, I really like (6) ………… seeing in that way. Whenever I visit this place, I always want to make some ceramic products to bring back home. I take some clay and (7) ………… it. The final products can be bowls, mugs, or plates. They are all beautiful and I use them every day. I really like Bat Trang village. I hope it will be our new place of (8) ………… Page 3 of 6 1. A. center B. suburbs C. outskirts D. urban 2. A. trip B. voyage C. holiday D. cruise 3. A. to B. for C. with D. of 4. A. clay B. soil C. moon D. sky 5. A. house B. housework C. home D. household 6. A. taking B. going C. playing D. using 7. A. mould B. knit C. carve D. sew 8. A. interesting B. interest C. interested D. interests
giải thích chi tiết có ngay hay nhất nhé
:)))))))))))))))))))))))))))))))))))))
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