Some Basic Conc...

A sample of municipal water contains one part of urea (molecular wt $$=60$$) per million parts of water by weight. The number of urea molecules in a drop of water of volume $$0.05\ ml$$ is 

If you are given Avogadro's number of atoms of a gas $$X$$. If half of the atoms are converted into $$X_{(g)}^+$$ by energy $$\Delta H$$. The IE of $$X$$ is :

The percentage of pyridine $$(C_5H_5N)$$ that forms pyridinium ion $$(C_5H_5NH)$$ in a $$0.10$$M aqueous pyridine solution is:

The amount of zinc required to produce $$224$$ ml of $$H_2$$ at NTP on treatment with dilute $$H_2SO_4$$ solution will be:

What quantity of lime stone on heating will give $$56\ kg$$ of $$CaO$$?

What mass of sodium chloride will react with 34.0 g of silver nitrate to produce 17 g of sodium nitrate and 28.70 g of silver chloride if the law of conservation of mass holds good ?

If average molecular wt. of air is 29, then assuming $$N_2$$ and $$O_2$$ gases are there which options are correct regarding composition of air:
i) 75% by mass of $$N_2$$
ii) 75% by moles $$N_2$$
iii) 72.41% by mass of $$N_2$$

$$4.6$$ $$cm^3$$ of methyl alcohol is dissolved in $$25.2$$g of water with density $$0.8$$. Calculate $$\%$$ by mass of methyl alcohol.

What mass of $$NaCl$$ would contain the same total number of ions as 245 g of $$MgCl_2$$?

The density (in g $$ml^{-1}$$) of a $$3.60$$M sulphuric acid solution having $$29\%$$ $$H_2SO_4$$ [molar mass $$=98$$g $$mol^{-1}$$] by mass, will be: