Some Basic Conc...

What weight of $$NaHSO_3$$ is required to react with $$100mL$$ of solution containing $$0.33g$$ of $$NaIO_3$$ according to the following reaction 
$${IO}_{3}^{\Theta}+HS{O}_{3}^{\Theta}\longrightarrow I^{\Theta}+{SO}_{4}^{2-}$$

Samples of gases $$O_2, N_2, CO$$ and $$CO_2$$ under the same conditions of temperature and pressure contain the same number of molecules represented by $$X$$. The molecules of oxygen occupy $$V$$ litres and have a mass of $$8\ g$$. Under the same conditions of temperature and pressure, what is the volume occupied by molecules of $$N_2$$?

$$60$$g of solution containing $$40\%$$ by mass of NaCl are mixed with $$100$$g of a solution containing $$15\%$$ by mass NaCl. Determine the mass percent of sodium chloride in the final solution.

How many grams of concentrated nitric acid solution should be used to prepare $$250\,mL$$ of $$2.0M\,\,\,HN{O_3}$$ ? The concentrated acid is $$70\% \,\,HN{O_3}.$$

$$C{O_2}$$ was collected from combustion of lime stone. The mass ratio of carbon and oxygen was found to be $$3:8$$. Find the mass ratio of oxygen and carbon in the $$C{O_2}$$ obtained by burning coke in excess oxygen.

In the mixture of $$(NaHCO_3 + Na_2CO_3$$) in 1:1 molar ratio, the volume of $$HCl$$ required is $$'x'$$ ml with methyl orange and $$'y'$$ ml with phenolphthalein indicator for 2 different titrations from start for equal volumes of original solution. The relation between $$x$$ and $$y$$ is:

What changes does not occur in presence of organic solvent when acidified $$K_{2}Cr_{2}O_{7}$$ reacts with $$H_{2}O_{2}$$ solutions?

100 gm impure $$CaCO_3$$ on heating gives 5.6 lit. $$CO_2$$ gas at NTP. Find the percentage of calcium in $$CaCO_3$$ sample.

An alloy has $$Fe, Co$$, and $$Mo$$ equal to 71%, 12%, and 12% respectively. How many cobalt atoms are there in a cylinder of radius 2.50 cm and a length of $$10.0\,c{m^2}$$? The density of alloy is $$8.20g/mL$$. 

A sample of potato starch was ground in a dall mill to give a starch like molecule of lower molecular weight. The product analyzed $$0.086\%$$ phosphorus .If each molecule is assumed to contain one atom of phosphorus. The molecular weight of the material is _______________.