13.5 g mol-1
18.5 g mol-1
47.4 g mol-1
74.0 g mol-1
Correct answer is D
250cm3 of distilled water contains 14.8g of salt(z)
1cm3 of distilled water will contain \(\frac{14.8 x 1}{250}\) of salt (z)
:. 1000cm3 of distilled water will contain \(\frac{14.8 x 1 x 1000}{250}\) = 59.2g/dm33 = \(\frac{concentration in g/dm3}{molar mass}
0.80 = \(\frac{59.2}{molar mass}\)
molar mass = \(\frac{59.2}{0.80}\) = 74.0 g/mol
Which of the following species does not contain a co-ordinate bond?
AI2CI6
CCI4
H3O+
NH + 4
Correct answer is A
No explanation has been provided for this answer.
Which of the following compounds has hydrogen bonds between its molecules?
HF
HBr
HCI
HI
Correct answer is A
No explanation has been provided for this answer.
covalent
dative
ionic
metallic
Correct answer is C
No explanation has been provided for this answer.
Which of the following statements about sodium is not true?
Na+ is smaller in size than Na
Na is smaller in size than Na+
Na+ has fewer electrons than Na
The effective nuclear charge in Na+ is greater than in Na
Correct answer is B
No explanation has been provided for this answer.