Some Basic Conc...

Flask I contains a gaseous mixture of $$He(g)$$, $$H_2(g)$$, in the molar ratio of $$1:\sqrt{2}$$. The gas mixture is allowed to effuse through a fine orifice in the flask l and is collected in flask ll. What is the average molar mass of gas mixture initially collected in flask ll?

32g of a sample of $${ FeSO }_{ 4 }.{ 7H }_{ 2 }O$$ where the dissolved in dilute Sulphuric acid and water and it's volume was made up to 1 litre, 25 mL of this solution required 20 mL of 0.02 $$M\ KMn{ O }_{ 4 }$$ solution of complete oxidation. Calculate the weight % of $$FeS{ O }_{ 4 }.{ 7H }_{ 2 }O$$ in the sample. 

Natural water contains about $$0.02\%$$ $$D_2O$$ (heavy water). When it is enriched to $$20\%$$ (by volume), calculate the fraction of weight due to neutrons in 1 mole of sample.

Find out the weight of solute (M. wt. 60) that is required to dissolve in $$180g$$ water to reduce the vapour pressure to $$\dfrac{4}{5}th$$ of pure water:

What mass of $$AgI$$ will dissolve in $$1.0L$$ of $$1.0M$$ $${NH}_{3}$$? neglect change in conc. of $${NH}_{3}$$
(Given : $${K}_{sp}=1.5\times {10}^{-16};{K}_{f}[Ag{({NH}_{3})}_{2}^{+}]$$; (At.mass $$Ag=108,I=127$$)

4.24 g of an organic compound on combustion produces 8.45 g of $${ CO }_{ 2 }$$ and 3.46 g of water. The mass percentage of $$C$$ and $$H$$ in the compound respectively are:

If a solution contains 34.2 g of sugar in 100 g of water. Find the concentration inn terms of mass by mass percentage of the solution?

If molecular weight of glucose-1-phosphate is 260 and its density is 1.5 gm $$ cm^{-3} $$. What is the average volume occupied by a molecule of this compound?

What percent of a sample of nitrogen must be allowed to escape if its temperature, pressure, and volume are to be changed from $$220^oC$$, $$3$$atm and $$1.65$$litre to $$110^oC$$, $$0.7$$ atm and $$1.00$$ litre respectively?

When 15gm of a mixture of $$NaCl$$ and $$Na_2CO_3$$ is heated with dilute hydrochloric acid, 2.5gm of $$CO_2$$ is evolved at NTP. Calculate percentage composition of $$Na_2CO_3$$ in a mixture.