Thủy phân hoàn toàn 28,14 kg chất béo trung tính cần vừa đủ 4,8 kg NaOH . Khối lượng glixerol thu được sau khi phản ứng xảy ra hoàn toàn là ( C =12, H = 1, O =16, Na = 23)

1/Cho 6,8g phenyl axetat tác dụng với 100ml dung dịch NaOH 2M. Sau khi phản ứng xảy ra hoàn toàn cô cạn dung dich thu đc bao nhiêu gam chất rắn ?

phép lai AaBb x Aabb

3.4/ Phân tử khối trung bình của polietilen X là 448.000 đvC. Hệ số polime hoá của PE là ( C = 12, H =1)

A.  14000.

B.  17000.

C.  13000.

D.  16000.

Cho sơ đồ phản ứng sau : glucoz → X → Y → etyl axetat . X và Y lần lượt là

A.  CO₂, CH₃COOH

B.  C₂H₅OH, CH₃COOH.

C.  C₂H₅OH, CH₃CHO.

D.  CH₃OH, CH₃COOH.

1.      The tree ________ near the gate of my house has lovely flowers

A. standing                     

B.stood                       

C.to stand                      

 D.stand

 1/ The issue cannot be tackled completely in the month _______.

A. to move

B. to go

C. to come

D. to leave
2/ Their trip to Italy had to be cancalled because their daughter suddenly _______ ill with flu.

A. left

B. bought

C. fell

D. caught
3.  He was sacked due to the fact that he had no _______ of responsibility towards the job. 
A. sense

B. effect

C. action

D. talent

She became very angry when I talked about my plan. She _______ my intentions.

A. should have misunderstood

B. must have misunderstood

C. needn't have misunderstood

D. couldn't have misunderstood

 _______ helps increase productivity, but it also causes the loss of many jobs.

A. automation

B. automatic

C. automatically

D. automate

1/ You can easily _______ malaria when you travel in the jungles where there are a lot of mosquitoes.

A. honour

B. contract

C. advance

D. follow

2/ John had a mission in life: _______ horizons of his own as he had promised.

A. deepening

B. broadening

C. spreading

D. accessing