26 Marks: 1 Which molecular formula are also empirical formula? Choose at least

Question

26

Marks: 1

Which molecular formula are also empirical formula?

Choose at least one answer.

Question27

Marks: 1

Which formula are molecular formula?

Choose at least one answer.

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.

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.

Question80

Marks: 1

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

Choose one answer.

Explanation / Answer

Q26.

All, except H2O2, are also empirical formula

The empirical formula of H2O2 is HO (only the proportions of the elements are provided).

Q27. A,B,D,F are molecular formula.

Note: Some authors consider that also the formula of mineral salts are molecular formula.

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

Q79.

Answer A. Here is the highest proportion C:O, i.e. 4C:1O

Q80.

CH3C6H2(NO2)3

(3+2)x3 = 15 Answer F

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