1/Cho một lượng bột sắt dư vào 200ml dung dịch phản H2SO4,phản ứng xong người ta thu được 7,437 lít khí hidro(đktc)

a/Tính số gam bột sắt tham gia phản ứng.

b/Tính nồng độ mol/l của dung dịch H2SO4 và nồng độ mol sản phẩm thu được.Biết thể tích dd sau phản ứng thay đổi không đáng kể.

6. Amsterdam, Holland, which is sometimes called Venice of Northern Europe __________.

A. which has many canals C. with many canals

B. it has many canals D. has many canals

7. The Egyptians constructed walls and embankments __________ marvels even today.

A. they are considered C. are considered

B. which are considered D. who are considered

8. Ernest Hemingway, a novelist and short-story writer, developed a prose style __________.

A. who influenced an entire generation of authors

B. influenced an entire generation of authors

C. that influenced an entire generation of authors

D. has influenced an entire generation of authors

9. The man______________ we consider our leader had much experience in climbing mountains.

A. who B. whose C. whom D. A & C correct

10. The artist ____________name I couldn’t remember was one of the best I had ever seen.

A. who B. whose C. that D. A & C correct

rút gọn √4a2/25 với a>0 ta được