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Perform the following calculation. Round off your answer to three digits. (8.39 107) (4.53 109)

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प्रश्न

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

(8.39 107) (4.53 109)

संख्यात्मक
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उत्तर

(8.39 107) (4.53 109)

= 38.02069337

= 38.0

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

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

संबंधित प्रश्‍न

To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.


Explain the term Saturated solution giving examples.


Calculate the amount of carbon dioxide that could be produced when 1 mole of carbon is burnt in 16 g of dioxygen.


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


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?


Solve the following problem:

Find out the molar mass of the following compounds:

Mohr’s salt [FeSO4(NH4)2SO4.6H2O]

(At. mass: Cu = 63.5; S = 32; O = 16; H = 1; Na = 23; C = 12; Fe = 56; N = 14)


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:

0.00477 × 105


Solve the following problem:

Write the following number in ordinary decimal form:

5.00858585


Solve the following problem:

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

`1/(3.40xx10^24)`


Solve the following problem:

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

`(8.94xx10^6)/(4.35xx10^4)`


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?


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

Two immiscible liquids.


When light is passed through water containing a few drops of milk, it shows a bluish tinge. This is due to the ______ of light by milk and the phenomenon is called ______. This indicates that milk is a ______ solution.


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.


Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100g of water?


If the concentration of glucose \[\ce{(C6H12O6)}\] in blood is 0.9 g L–1, what will be the molarity of glucose in blood?


Sulphuric acid reacts with sodium hydroxide as follows:

\[\ce{H2SO4 + 2NaOH -> Na2SO4 + 2H2O}\]

When 1 L of 0.1 M sulphuric acid solution is allowed to react with 1 L of 0.1 M sodium hydroxide solution, the amount of sodium sulphate formed and its molarity in the solution obtained is:

(i) 0.1 mol L–1

(ii) 7.10 g

(iii) 0.025 mol L–1

(iv) 3.55 g


Which of the following terms are unitless?

(i) Molality

(ii) Molarity

(iii) Mole fraction

(iv) Mass percent


What is the difference between molality and molarity?


With increase of temperature, which of these changes?


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.


The molarity of urea (molar mass 60 g mol−1) solution by dissolving 15 g of urea in 500 cm3 of water is ______.


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