Calculate the concentration of nitric acid in moles per litre in a sample which has a density, 1.41 g mL–1

Monjur Alahi

Calculate the concentration of nitric acid in moles per litre in a sample which has a density, 1.41 g mL–1 and the mass per cent of nitric acid in it being 69%.


0 like 0 dislike
1 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

Solution: We have

Mass percent of HNO3=69%

Hence mass of HNO3 in the solution is 69g

Mass of water=100-69=31g

Number of moles of HNO3 =69/63=1.09moles

Density=mass/volume

Volume=mass/density

  =100/1.41=70.9ml

Concentration (Molarity) = number of moles of solute/volume of the solution

   = (1.09/70.9)×100

  = 1.5M

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
(a) Calculate the number of moles in 112 g of iron. (b) Calculate the mass of 0.5 moles of sugar (C12H22O11).

(a) 1 mole of iron (Fe) = 56 g (molar mass)  Since 56 g of iron = 1 mol  Therefore, 112 g of iron= 1/ 56 ×112 mol = 2 mol  (b) Molar...

1 Answers 1 views
John placed 10 moles of sulphur molecules (S8) and 5 moles of glucose (C6H12O6) in the two different pans of a physical balance.

Molecular mass of sulphur molecules (S8)  = 32 × 8 = 256 gm  Molecular mass of glucose (C6H12O6)  =(6 × 12) +( 1 × 12) +( 6 × 16)  = 72 + 12 +...

1 Answers 1 views
Which of the following correctly represents 360 g of water? (i) 2 moles of H20 (ii) 20 moles of water

(d) (ii) and (iv).....

1 Answers 1 views
Verify by calculating that (a) 5 moles of CO2 and 5 moles of H2O do not have the same mass.

(a) CO2 has molar mass               = 44g mol–1  5 moles of CO2 have molar mass = 44 × 5               ...

1 Answers 1 views
A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?

1 mole of oxygen atoms = 6.023×1023 atoms  ∴Number of moles of oxygen atoms =   2.58 ×1024 / 6.022×1023                             ...

1 Answers 1 views
The mass per unit volume of a substance is called density (density = mass/volume).

The given substances in the increasing order of their densities can be represented as: Air < Exhaust from chimney < Cotton < Water < Honey < Chalk < Iron 

1 Answers 1 views
Number of individuals of a population in a habitat per unit area is called density and density is measured in different units.

a. Nos. / Vol;  b. Coverage / area;  c. Biomass / area  d. Nos. / area; e. Wt. / area

1 Answers 1 views
Number of individuals of a population in a habitat per unit area is called density and density is measured in different units

 a. Nos. / Vol;  b. Coverage / area;  c. Biomass / area;  d. Nos. / area;  e. Wt. / area 

1 Answers 1 views
One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture will be

(d) between 30°C and 50°C

1 Answers 1 views
For an ideal gas, number of moles per litre in terms of its pressure P, gas constant R and temperature T is.

(c) : From ideal gas equation, PV = nRT Therefore,  n/V = P/RT (number of moles = n/V)

1 Answers 1 views