How many grams of the concentrated nitric solution should be use

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261.

How many grams of the concentrated nitric solution should be used to prepare 250 mL o 2.0M HNO3 ? The concentrated acid is 70% HNO3.

  • 45.0 g conc. HNO3

  • 90.0 g conc. HNO3

  • 70.0 g conc. HNO3

  • 70.0 g conc. HNO3


A.

45.0 g conc. HNO3

Given, molarity of solution = 2
Volume of solution = 250 mL = 250/1000 = 1/4 L
Molar mass of 

HNO3 = 1+14+3 x 16 = 63 g mol-1
therefore, Molarity

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262.

6.02 x 1020 molecules of urea are present in 100 mL of its solution. The concentration of solution is

  • 0.02 M

  • 0.01 M

  • 0.001 M

  • 0.001 M

1596 Views

263.

Mole fraction of the solute in a 1.00 molal aqueous solution is 

  • 0.0177

  • 0.0344

  • 1.7700

  • 1.7700

449 Views

264.

Which one of the following statements is not true?

  • Concentration of DO below 6 ppm is good for the growth of fish

  • Clean water would have a BOD value of less than 5 ppm

  • Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant

  • Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant

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265.

If Avogadro number NA, changed from 6.022 x 1023 mol-1 this would change

  • the definition of mass in units of grams

  • the mass of one mole of carbon

  • the ratio of chemical species to each other in the balanced equation

  • the ratio of chemical species to each other in the balanced equation

2828 Views

266.

20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (Atomic weight of Mg =24)

  • 75

  • 96

  • 60

  • 60

4442 Views

267.

What is the mass of precipitate formed when 50 mL of 16.9% solution of AgNO3 is mixed with 50 mL of 5.8% NaCl solution?

(Ag = 107.8, N = 14, O = 16, Na = 23, Cl = 35.5)


  • 28 g

  • 3.5 g 

  • 7 g 

  • 7 g 

1927 Views

268.

What is the mole fraction of the solute in a 1.00 m aqueous solution? 

  • 0.177

  • 1.770

  • 0.0354

  • 0.0354

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269.

The number of water molecules is maximum in 

  • 18 molecules of water

  • 1.8 g of water

  • 18 g of water

  • 18 g of water

1478 Views

270.

Which has the maximum number of molecules among the following?

  • 44 g CO2

  • 48 g O3

  • 8 g H2

  • 8 g H2

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