Advertisements
Advertisements
प्रश्न
Explain the term molality
Advertisements
उत्तर
Molality is the number of moles of solute present in 1 kg of solvent. It is denoted by m.
Molality is expressed as follows:
Molality (m) = `"Number of moles of solute"/"Mass of solvent in kilograms"`
APPEARS IN
संबंधित प्रश्न
Explain the term Saturated solution giving examples.
What is the concentration of sugar (C12H22O11) in mol L–1 if its 20 g are dissolved in enough water to make a final volume up to 2 L?
If the density of methanol is 0.793 kg L–1, what is its volume needed for making 2.5 L of its 0.25 M solution?
Explain the term mole fraction.
Solve the following problem:
Write the following number in ordinary decimal form:
3.49 × 10−11
Solve the following problem:
Write the following number in ordinary decimal form:
43.71 × 10−4
Solve the following problem:
Write the following number in ordinary decimal form:
0.011 × 10−3
Solve the following problem:
Write the following number in ordinary decimal form:
14.3 × 10−2
Solve the following problem:
Write the following number in ordinary decimal form:
0.00477 × 105
Perform each of the following calculations. Round off your answers to three digits.
(3.26104) (1.54106)
Perform the following calculation. Round off your answer to three digits.
(8.39 107) (4.53 109)
Solve the following problem:
Perform the following calculation. Round off your answer to three digits.
`((9.28xx10^9)(9.9xx10^-7))/((511)(2.98xx10^-6))`
A 1.000 mL sample of acetone, a common solvent used as a paint remover, was placed in a small bottle whose mass was known to be 38.0015 g.
The following values were obtained when the acetone-filled bottle was weighed: 38.7798 g, 38.7795 g and 38.7801 g. How would you characterise the precision and accuracy of these measurements if the actual mass of the acetone was 0.7791 g?
Solve the following problem:
Your laboratory partner was given the task of measuring the length of a box (approx 5 in) as accurately as possible, using a metre stick graduated in milimeters. He supplied you with the following measurements:
12.65 cm, 12.6 cm, 12.65 cm, 12.655 cm, 126.55 mm, 12 cm.
Give your reason for rejecting each of the others.
Solve the following problem:
The hourly energy requirements of an astronaut can be satisfied by the energy released when 34 grams of sucrose are “burnt” in his body. How many grams of oxygen would be needed to be carried in space capsule to meet his requirement for one day?
Name the process associated with the following
A drop of ink placed on the surface of water contained in a glass spreads throughout the water.
What are the favourable qualities given to gold when it is alloyed with copper or silver for the purpose of making ornaments?
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a lustrous non-metal.
What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per 500 mL?
If the concentration of glucose \[\ce{(C6H12O6)}\] in blood is 0.9 g L–1, what will be the molarity of glucose in blood?
What will be the molality of the solution containing 18.25 g of \[\ce{HCl}\] gas in 500 g of water?
What is the difference between molality and molarity?
The molarity of pure water is ______.
What quantity (in mL) of a 45% acid solution of a monoprotic strong acid must be mixed with a 20% solution of the same acid to produce 800 mL of a 29.875% acid solution?
Molarity of liquid HCl will be if the density of the solution is 1.17 g/cc.
Find the molality of solution if boiling point increases by 1.75 K and molal elevation constant of solvent is 5K kg mol-1.
