Question

26

Marks: 1

Which molecular formula are also empirical formula?

Choose at least one answer.

	A. CH4
	B. H2O2
	C. Al2O3
	D. CHCl3
	E. NaCl
	F. CH3OH

Question27

Marks: 1

Which formula are molecular formula?

Choose at least one answer.

A. CH₄

B. H₂O₂

C. Al₂O₃

D. CHCl₃

E. NaCl

F. CH₃OH

A piece of solid CO₂ is placed in a evacuated container. What is in the container when all the carbon dioxide is sublimed?

Choose one answer.

A. CO₂(g)

B. C(g) and O₂(g)

C. C(s) and O₂(g)

D. C(s), O₂(g) and CO₂(g)

79

Marks: 1

A series of experiments in organic chemistry produced a variety of compounds of carbon hydrogen and oxygen. Which product contained the highest percent mass of carbon?

Choose one answer.

	A. Diethylether (C2H5)2O
	B. Acetic acid CH3CO2H
	C. Acetone (CH3)2CO
	D. Ethanol C2H5OH
	E. Acetaldehyde CH3CHO
	F. Ethyl acetate CH3CO2C2H5

Question80

Marks: 1

How many atoms of hydrogen are in three molecules of TNT CH₃C₆H₂(NO₂)₃?

Choose one answer.

	A. 2
	B. 3
	C. 4
	D. 5
	E. 10
	F. 15
	G. 20
	H. 45