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.

Calculate the number of gram molecules of water in a beaker conatining 576 g of water 

Give an example of molecule in which the ratio of the molecular formula is six times the empirical formula.

Why are the atomic mass most of the elements is fractional?

How can you prove that red oxide of copper is not an element ?

Suppose the length of a cardboard has been reported to be 31.24 cm. What is the minimum uncertainty implied in this measurement ?

What is the difference between 5.0 g and 5.00 g ?

Round up the following up to three significant figures:
(i) 34.216
(ii) 10.4107
(iii) 0.04597
(iv) 2808

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

\({ Fe }_{ 2 }({ SO }_{ 4 }{ ) }_{ 3 }\) is used in water and sewage treatment to aid the removal of suspended impurities. Calculate the mass percentage of iron and sulphur in this compound. 

Compute the mass of one molecule and the molecular mass of \({ C }_{ 6 }H_{ 6 }\) (benzene) (atomic mass of C = 12\(\mu \), H = 1\(\mu \))

Sulphuric acid reacts with sodium hydroxide as follows
\({ H }_{ 2 }{ SO }_{ 4 }+2NaOH{ \longrightarrow }{ Na }_{ 2 }{ SO }_{ 4 }+H_{ 2 }O\) When 1L of 0.1M sulphuric acid solution is allowed to react with 1L of 0.1 M sodium hydroxide solution, the amount of sodium sulphate formed and its molarity in the solution obtained is

Calculate the number of moles in the following mass."7.9 mg of Ca"

A gold coloured metal object has a mass of 365 g and a volume of 22.12 cm³. Is the object composed of pure gold?

The mass of a liter of oxygen at standard conditions of temperature and pressure is 1.43g and that of a liter of \({ SO }_{ 2 }\)is 2.857 g. What is the mass in gram of a single molecule of each gas?

The mass of a liter of oxygen at standard conditions of temperature and pressure is 1.43g and that of a liter of \({ SO }_{ 2 }\)is 2.857 g. What are the molecular masses of \({ SO }_{ 2 }\) and \({ O }_{ 2\\ }\)respectively?

\(9.7\times { 10 }^{ 17 }\) atoms of iron weigh as much as 1 cc of \({ H }_{ 2 }\) at STP. What is the atomic mass of iron?

A Welding fuel gas contains carbon and hydrogen only. Buring a small sample of it in oxygen gives 3.38g carbon dioxide, 0.690 g of water and no other products. A volume 10.0 L (measured at STP) of this welding gas is found to weigh 11.6 g.
(a) Calculate. Molar mass of the gas.
(b) Calculate. molecular formula.