Advertisements
Advertisements
प्रश्न
Nalorphene (C19H21NO3), similar to morphine, is used to combat withdrawal symptoms in narcotic users. Dose of nalorphene generally given is 1.5 mg. Calculate the mass of 1.5 × 10−3 m aqueous solution required for the above dose.
Advertisements
उत्तर
Given: m = 1.5 × 10−3
The molar mass of nalorphene (C19H21NO3) = 19 × 12 + 21 × 1 + 1 × 14 + 3 × 16
= 311 g mol−1
In a 1.5 × 10−3 m aqueous solution of nalorphene,
1 kg (1000 g) of water contains 1.5 × 10−3 mol.
= 1.5 × 10−3 × 311 g
= 0.467 g
= 467 mg
∴ Total mass of the solution = (1000 + 0.467) g
= 1000.467 g
Thus, for 467 mg of nalorphene, the solution required is 1000.467 g.
∴ The mass of the solution containing 1.5 mg of nalorphene = `1000.467/467 xx 1.5`
= 3.21 g
Hence, the mass of the aqueous solution required is 3.21 g.
संबंधित प्रश्न
Calculate (a) molality (b) molarity and (c) mole fraction of KI if the density of 20% (mass/mass) aqueous KI is 1.202 g mL−1.
A solution of glucose in water is labelled as 10% w/w, what would be the molality and mole fraction of each component in the solution? If the density of solution is 1.2 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.
Define molality.
What is molal depression constant? Does it depend on nature of the solute?
Molarity of the solution is ____________.
The sum of all mole fraction for a mixture is always equal to ____________.
When a solute is present in trace quantities the following expression is used:
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 ______.
How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0M HNO3? The concentrated acid is 70% HNO3:
For preparing 0.1 N solution of a compound from its impure sample of which the percentage purity is known, the weight of the substance required will be:
Mole fraction of C3H5(OH)3 in a solution of 36 g of water and 46 g of glycerine is ______.
Out of molality (m), molarity (M), formality (F) and mole fraction (x), those which are independent of temperature are:
Given below are two statements labelled as Assertion (A) and Reason (R).
Assertion (A): Molarity of a solution changes with temperature.
Reason (R): Molarity is a colligative property.
Select the most appropriate answer from the options given below:
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)
Define the following modes of expressing the concentration of a solution. Which of these modes are independent of temperature and why?
x (mole fraction)
Define the following modes of expressing the concentration of a solution. Which of these modes are independent of temperature and why?
m (Molality)
The unit of ebullioscopic constant is
Calculate the mass percent of benzene (CoH6) and carbon tetrachloride (ccl4) if 22 g of benzene is dissolved in 122 g of carbon tetrachloride.
