1. She (go) ____ shopping with her friends yesterday.2. It's cloudy. Don't go out without an umbrella because it (be) _____ rain.3. Everyday, she often (get) _____ up at 6 a.m. She (brush) ____ her teeth and (have) _____ breakfast. After that, she (go) _____ to school and (learn) ____ from 7 a.m to 11 a.m. 4. A: Hey, can you (go) ____ out and (buy) ____ some bread for me? B: OK. I (buy) _____ it for you.5. I (not see) ____ you for ages.6. There (be) _____ a pen and two books on the table.7....
Đọc tiếp
1. She (go) ____ shopping with her friends yesterday.
2. It's cloudy. Don't go out without an umbrella because it (be) _____ rain.
3. Everyday, she often (get) _____ up at 6 a.m. She (brush) ____ her teeth and (have) _____ breakfast. After that, she (go) _____ to school and (learn) ____ from 7 a.m to 11 a.m.
4. A: Hey, can you (go) ____ out and (buy) ____ some bread for me?
B: OK. I (buy) _____ it for you.
5. I (not see) ____ you for ages.
6. There (be) _____ a pen and two books on the table.
7. A: What (be) ____ you doing?
B: I (do) ____ my homework and (study) _____ English.
8. She (live) ____ in Nam Dinh.
9. A: How much (be) ____ this shirt?
B: It (be) _____ $5.
10. A: What (do) ____ tomorrow?
B: I still don't have a plan. Maybe I (go) ____ swimming with my friends.
MhhMhh = 20,375 . 2 = 40,75(g/mol)
a)Gọi x,y lần lượt là số mol của SO2SO2 và H2H2
theo quy tắc đường chéo ta có:
x mol SO2SO2 (M=64) 38,75
40,75
y mol H2H2 (M=2) 23,25
=> xyxy = 38,7523,2538,7523,25 = 5353
suy ra %VSO2VSO2 = 55+355+3 . 100% =62,5%
%VH2VH2 = 100% - 62,5% =37,5%
b) nAnA = mMmM = 32,640,7532,640,75 = 0,8(mol)
VAVA = n . 22,4 = 0,8.22,4 = 17,92(l)
c) MBMB = 21,35.2 =42,7(g/mol)