Advertisements
Advertisements
प्रश्न
Calculate the molarity of the following solution:
30 g of Co(NO3)2 . 6H2O in 4.3 L of solution.
Advertisements
उत्तर
Molar mass of Co(NO3)2 . 6H2O = 58.7 + 2(14 + 48) + 6 × 18 g mol−1
= 58.7 + 2(62) + 108 g mol−1
= 58.7 + 124 + 108 g mol−1
= 290.7 g mol−1
∴ Number of moles of Co(NO3)2 . 6H2O = `"Mass"/"Molar mass"`
= `(30 g)/(290.7 g "mol"^(-1))`
= 0.103 mol
Volume of solution = 4.3 L
Molarity of solution = `"Number of moles of solute"/"Volume of solution in L"`
= `(0.103 "mol")/(4.3 "L")`
= 0.024 M
APPEARS IN
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.
Define mass percentage.
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?
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 solubility product of CuS is 6 × 10−16, calculate the maximum molarity of CuS in aqueous solution.
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.
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
Define Normality.
Molality of a solution relates the ____________.
Molarity of the solution is ____________.
2.5 litres of NaCl solution contain 5 moles of the solute. What is the molarity?
The mole fraction of the solute in one molal aqueous solution is ____________.
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:
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?
ppm. (parts per million)
The de Broglie wavelength of a car of mass 1000 kg and velocity 36 km/hr 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 the normality of 0.3 m H3Pcl solution?
Calculated the mole fraction of benzene in a solution containing 30% by mass of its is carbon tetrachloride
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.
