हिंदी

Perform each of the following calculations. Round off your answers to three digits. (3.26104) (1.54106)

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प्रश्न

Perform each of the following calculations. Round off your answers to three digits.

(3.26104) (1.54106)

संख्यात्मक
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उत्तर

(3.26104) (1.54106)

= 5.025458302

= 5.03

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अध्याय 2: Introduction to Analytical Chemistry - Exercises [पृष्ठ २५]

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बालभारती Chemistry [English] Standard 11 Maharashtra State Board
अध्याय 2 Introduction to Analytical Chemistry
Exercises | Q 4. (Q)(a) | पृष्ठ २५

संबंधित प्रश्न

Calculate the amount of carbon dioxide that could be produced when 2 moles of carbon are burnt in 16 g of dioxygen.


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A sample of drinking water was found to be severely contaminated with chloroform, CHCl3, supposed to be carcinogenic in nature. The level of contamination was 15 ppm (by mass).

  1. Express this in percent by mass.
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Dinitrogen and dihydrogen react with each other to produce ammonia according to the following chemical equation:

\[\ce{N2 (g) + 3H2 (g) → 2NH3 (g)}\]

(i) Calculate the mass of ammonia produced if 2.00 × 103 g dinitrogen reacts with 1.00 × 103 g of dihydrogen.

(ii) Will any of the two reactants remain unreacted?

(iii) If yes, which one and what would be its mass?


Explain the term molality


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Find out the molar mass of the following compounds:

Mohr’s salt [FeSO4(NH4)2SO4.6H2O]

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Write the following number in ordinary decimal form:

0.00477 × 105


Solve the following problem:

Perform the following calculation. Round off your answer to two digits.

`33/(9.00xx10^-4)`


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Perform the following calculation. Round off your answer to two digits.

`(1.4xx10^9)/((2.77xx10^3)(3.76xx10^5))`


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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.
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Give an example of each mixture having the following characteristics. Suggest a suitable method to separate the components of this mixture

Two immiscible liquids.


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.


A child wanted to separate the mixture of dyes constituting a sample of ink. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in Fig.2.3. The filter paper was removed when the water moved near the top of the filter paper.

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(ii) Name the technique used by the child.

(iii) Suggest one more application of this technique.


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What will be the molality of the solution containing 18.25 g of \[\ce{HCl}\] gas in 500 g of water?


Which of the following terms are unitless?

(i) Molality

(ii) Molarity

(iii) Mole fraction

(iv) Mass percent


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