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
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?
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?
Calculate the mass percentage of aspirin (C9H8O4) in acetonitrile (CH3CN) when 6.5 g of C9H8O4 is dissolved in 450 g of CH3CN.
A sample of 12 M Concentrated hydrochloric acid has a density 1.2 M gL-1 calculate the molality.
Molality of a solution relates the ____________.
Molarity of the solution is ____________.
10 g of NaCl is dissolved in 106 g of the solution. Its concentration is ____________.
2.5 litres of NaCl solution contain 5 moles of the solute. What is the molarity?
5 ml of N HCl, 20 ml of N/2 H2SO4 and 30 ml of N/3 HNO3 are mixed together and volume made to one litre. The normality of the resulting solution is:
If N/10 50 ml H2SO4, N/3 30 ml HNO3, N/2 10 ml HCl is mixed and solution is made to 1 L. Then normality of the resultant solution is:
A solution is prepared by dissolving 10 g NaOH in 1250 mL of a solvent of density 0.8 mL/g. The molality of the solution in mol kg–1 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:
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:
Match the terms given in Column I with expressions given in Column II.
| Column I | Column II |
| (i) Mass percentage | (a) `"Number of moles of the solute component"/"Volume of solution in litres"` |
| (ii) Volume percentage | (b) `"Number of moles of a component"/"Total number of moles of all the components"` |
| (iii) Mole fraction | (c) `"Volume of the solute component in solution"/"Total volume of solution" xx 100` |
| (iv) Molality | (d) `"Mass of the solute component in solution"/"Total mass of the solution" xx 100` |
| (v) Molarity | (e) `"Number of moles of the solute components"/"Mass of solvent in kilograms"` |
Define the following modes of expressing the concentration of a solution. Which of these modes are independent of temperature and why?
M (Molarity)
3.36 M sulphuric acid solution is 29% H2SO4 calculate the density of the solution.
Calculate the mass percent of benzene (CoH6) and carbon tetrachloride (ccl4) if 22 g of benzene is dissolved in 122 g of 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.
