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
Define mole fraction.
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?
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.
What is molal depression constant? Does it depend on nature of the solute?
A sample of 12 M Concentrated hydrochloric acid has a density 1.2 M gL-1 calculate the molality.
The sum of all mole fraction for a mixture is always equal to ____________.
Which of the following is a quantitative description of the solution?
An aqueous solution of glucose is 10% in strength. The volume in which 1 g mole of it is dissolved, will be:
25 ml of a solution of barium hydroxide on titration with a 0.1 molar solution of hydrochloric acid gave a titre value of 35 ml. The molarity of barium hydroxide solution was ______.
The volume of 4 N HCl and 10 N HCl required to make 1 litre of 6 N HCl are ____________.
A solution made by dissolving 40 g NaOH in 1000 g of water is ____________.
Which of the following units is useful in relating concentration of solution with its vapour pressure?
Out of molality (m), molarity (M), formality (F) and mole fraction (x), those which are independent of temperature are:
Which of the following is a correct statement for C2H5Br?
Define the following modes of expressing the concentration of a solution. Which of these modes are independent of temperature and why?
(iii) w/V (mass by volume percentage)
The number of electrons involved in the reduction of one nitrate ion to hydrazine is
A solution has been prepared by dissolving 5 g of urea in 95 g of water. What is the mass percentage of urea in the solution?
What is molarity of resulting solution obtained by mixing 8.5 L of 0.5 m urea solution and 500 ml of 2 m urea solution?
