1. Đốt cháy \(a\left(g\right)P\) trong \(b\left(l\right)O_2\) ở đktc thu được \(14,2\left(g\right)P_2O_5\). Tìm a,b

2. Cho 200g dd \(Na_2CO_3\) \(10,6\%\) tác dụng hết với dung dịch \(CaCl_2\) \(22,2\%\)

a) \(m_{dd_{CaCl_2}}=?\)

b) \(m_{kếttủa_{CaCO_3}}=?\)

c) \(C\%ddNaCl=?\)

Factories don't dump waste into rivers if the government (fine) ______ them heavily.

V. Listen carefully and choose the best answer (A, B or C) to complete each sentence.

36. What is the purpose of the woman's visit?

A. business B. pleasure C. business and pleasure

37. Where will the woman stay during her trip?

A. at a friend's home B. at a hotel C. at a university dormitory

38. About how long will the woman be in the country?

A. one or two days B. three or four days C. more than four days

39. What things are in the woman's luggage?

A. clothing, computer, and books

B. CD player, clothing, and books

C. books, gifts and computer

40. What other piece of information do we learn about the woman?

A. Her parents are on the same trip.

B. She enjoys traveling to different countries.

C. She was born in that country