Đáp án:
A: 2,46g
Giải thích các bước giải:
mC=$\frac{7,92}{44}$.12=2,16g
mH=$\frac{2,7}{18}$.2=0,3g
mX=mC+mH=2,16+0,3=2,46g
=>Chon A
`A`
`n_{CO_2} = {7,92}/{44} = 0,18(mol)`
Bảo toàn `C→ n_C= 0,18(mol)`
`n_{H_2O} = {2,7}/{18} = 0,15(mol)`
Bảo toàn `H→ n_H= 0,3(mol)`
`m= 0,18 .12+ 0,3=2,46(g)`
TEST FOR UNIT 8 I. Choose the word whose underlined part is pronounced differently from the others. 1. a. free b. team c. read d. idea 2. a. swimming b. skipping c. driving d. fishing 3. a. racket b. skateboard c. games d. player 4. a. thing b. father c. healthy d. three 5. a. rackets b. goggles c. skis d. skateboards II. Write the name of the game or sport. 1. bike, helmet, ride, race ___________________________________ 2. ball, goal, kick, penalty ___________________________________ 3. ring, gloves, punch, mouth guard ___________________________________ 4. racket, net, shuttlecock, serve ___________________________________ 5. goggles, snow, skis, poles ___________________________________ 6. court, racket, rubber ball, net, set ___________________________________ 7. ball, table, paddle, serve ___________________________________ 8. basket, ball, court, throw, points ___________________________________ III. Circle the odd one out. 1. football tennis volleyball boxing 2. goggles courts skis skateboards 3. paddle ball bat racket 4. referee player coach stadium 5. career healthy sporty fit IV. Choose the best answer a, b, c or d to complete the sentence. 1. My friend Mark is very good__________volleyball. He plays volleyball very well. a. in b. on c . at d. with 2. We often go swimming__________Sunday morning. a. in b. on c. at d. for 3. Football is an example of a__________sport where you play with several other people. a. team b. individual c. indoor d. dangerous 4. We were very upset when our favourite team didn’t __________ even one goal. a. play b. kick c. point d. score 5. Badminton requires only a net, a racket, and a birdie or__________ a. ball b. ski c. shuttlecock d. goggles 6. The person who makes sure that a game is played according to the rules is called a__________ a. coach b. referee c. judge d. player 7. __________ up the tree! You’ll fall down. a. Climb b. Climbing c. Not to climb d. Don’t climb 8. __________spectator sports in Britain are cricket and football. a. More popular b. The more popular c. Most popular d. The most popular 9. __________are the Olympic Games held? - Every four years. a. When b. Where c. How long d. How often 10. Which sport happens in a ring? a. Boxing b. Basketball c. Aerobics d. Swimming
em hãy viết hàm để tìm giá trị bé nhất của dãy số 10, 15, 17, 33, 45?
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