Advertisements
Advertisements
प्रश्न
Calculate the mass percentage of aspirin (C9H8O4) in acetonitrile (CH3CN) when 6.5 g of C9H8O4 is dissolved in 450 g of CH3CN.
Advertisements
उत्तर
Given: Mass of aspirin = 6.5 g
Mass of acetonitrile = 450 g
Mass percent of aspirin = `"Mass of aspirin"/("Mass of aspirin" + "Mass of acetonitrile") xx 100`
= `6.5/(6.5 + 450) xx 100`
= `6.5/456.5 xx 100`
= 1.424%
संबंधित प्रश्न
Calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride.
Concentrated nitric acid used in laboratory work is 68% nitric acid by mass in aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 g mL−1?
How many mL of 0.1 M HCl are required to react completely with 1 g mixture of Na2CO3 and NaHCO3 containing equimolar amounts of both?
An antifreeze solution is prepared from 222.6 g of ethylene glycol (C2H6O2) and 200 g of water. Calculate the molality of the solution. If the density of the solution is 1.072 g mL−1, then what shall be the molarity of the solution?
If the density of some lake water is 1.25 g mL−1 and contains 92 g of Na+ ions per kg of water, calculate the molality of Na+ ions in the lake.
When KOH solution is added to potassium dichromate solution the colour of solution
changes to yellow, because _______
(A) chromate ion changes to dichromate ion
(B) dichromate ion changes to chromate ion
(C) oxidation number of chromium changes from + 6 to + 4
(D) oxidation number of chromium changes from + 4 to +6
22.22 gram of urea was dissolved in 300 grams of water. Calculate the number of moles of urea and molality of the urea solution.
(Given: Molar mass of urea = 60 gram mol−1)
Molality of a solution relates the ____________.
Molarity of the solution is ____________.
1 M, 2.5 litre NaOH solution is mixed with another 0.5 M, 3 litre NaOH solution. Then find out the molarity of the resultant solution:
An X molal solution of a compound in benzene has mole fraction of solute equal to 0.2. The value of X is ____________.
The molarity of pure water is ____________.
Which of the following units is useful in relating concentration of solution with its vapour pressure?
Define the following modes of expressing the concentration of a solution. Which of these modes are independent of temperature and why?
x (mole fraction)
3.36 M sulphuric acid solution is 29% H2SO4 calculate the density of the solution.
Calculated the mole fraction of benzene in a solution containing 30% by mass of its is carbon tetrachloride
138 g ethyl alcohol is mixed with 72 g of water. The ratio of mole fraction of alcohol to water is ______.
A 5% solution of \[\ce{Na2SO4.10H2O}\] (MW = 3 22) is isotonic with 2% solution of non- electrolytic, non volatile substance X. Find out the molecular weight of X.
The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.
Calculate the molarity of the following solution:
30 mL of 0.5 M H2SO4 diluted to 500 mL.
