JAMB Chemistry Past Questions & Answers - Page 284

1,416.
1,417.

For a gas, the relative molecular mass is equal to 2Y. What is Y?

A.

The mas of the gas

B.

The vapour density of the gas

C.

The volume of the gas

D.

The temperature of the gas

Correct answer is B

No explanation has been provided for this answer.

1,418.

To what temperature must a gas 273 K be heated in order to double both its volume and pressure?

A.

298 K

B.

546 K

C.

819 K

D.

1092 K

Correct answer is D

No explanation has been provided for this answer.

1,419.

8g CH4 occupies 11.2 dm3 at s.t.p. What volume would 22 g of CH3CH2CH3 occupy under the same condition?

(C = 12, H = 1)

A.

3.7 dm3

B.

11.2 dm3

C.

22.4 dm3

D.

33.6 dm3

Correct answer is B

1 mole of any gas has a volume of 22.4dm3 at STP,  SO 1mole of propane = 44g = 22.4dm3

                                                                                                                              22g = ?

 ( 22 x 22.4)/ 44 = 11.2dm3

1,420.

At the same temperature and pressure, 50 cm<sup>3</sup> of nitrogen gas contains the same number of molecules as?

A.

25 cm3 of methane

B.

40 cm3 of hydrogen

C.

50 cm3 of ammonia

D.

100 cm3 of chlorine

Correct answer is C

No explanation has been provided for this answer.