Some Basic Conc...

An organic compound made of $$C, H$$ and $$N$$ contains $$20$$% nitrogen. Its  minimum molecular weight is:

At $$\displaystyle\, 80^{\circ}C$$ the vapour pressure of pure liquid A is 250 mm of Hg and that of pure liquid B is 1000 mm of Hg. If a solution of A and B boils at $$\displaystyle\, 80^{\circ}C$$ and 1 atm pressure, the amount of A in the mixture is (1 atm = 760 mm Hg) 

Which symbol is used to represent the unit of atomic mass, amu?

$$CH_3CH_2CH_2CH_{3(g)}\rightleftharpoons CH_3-\underset{iso-butane}{\underset{CH_3}{\underset{|}{C}H}}-CH_{3(g)}$$

4.88 g of $$KClO_3$$ when heated produced 1.92 g of $$O_2$$ and 2.96 g of KCl. Which of the following statements regarding the experiment is correct?

Which of the following statements best explains the law of conservation of mass, concerning a chemical change?

The density of a gas is $$1.78 \ g \ L^{-1}$$ at STP. The weight of one mole of gas is:

At $$-50^0C$$, liquid $$NH_3$$ has ionic product is $$10^{-30}$$. How many amide $$(NH_2{^-})$$ ions are present per $$mm^3$$ in pure liquid $$NH_3$$ ? Take $$N_a \, = \, 6 \times \, 10^{23}$$

Which of the following gases will have least volume if 10 g of each gas is taken at same temperature and pressure?

What will be the mass of 100 atoms of hydrogen?