One mole of CO₂ contains _______.

5.6 litres of oxygen at NTP is equivalent to _______.

How many grams are contained in 1 gram atom of Na?

12 g of Mg will react completely with an acid to give: _______.

Which of the following has the highest mass?

Using the unit conversion factor, express 1.54mm s^-1 into pm \(\mu \)s^-1.

How many moles of atoms are present in 9.0 g of aluminum?

Calculate the mass of a sample of iron metal that contains 0.250 moles of iron atoms.

Describe the difference between the mass of mole of oxygen atom (O) and the mass of a mole of oxygen molecule \(({ O) }_{ 2 }\)

Which of these is not an empirical formula?

Convert the following into kg.
(a) "0.91 x 10^-27 g( mass of electron)"
(b) "700g (mass of human DNA molecule )"

Express the following number to three significant figures.
(a) "6.0263"
(b) "2.3652"
(c) "Sixty thousand"
(d) " 2.861×10⁵ "

What is the SI unit of molarity?

What is an atom according to Dalton's atomic theory?

Express the following up to four significant figures. '6.5089'

Express the following up to four significant figures. '32.3928'

A liquid has a volume of 49.0 cm³ and a mass of 57.642 g. Find out the density of this liquid in SI unit.

Perform the following calculation to proper number of significant figures.
(a) 108/7.2
(b) (1.6 ×10²)²
(c) (1.0042 - 0.0034) (1.23)

The vapour density of a mixture of NO₂ and N₂O₄ is 38.3 at 27^oC. Calculate the number of moles of NO₂ in 100 g of the mixture.