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Solve the following problem: Write the following number in ordinary decimal form: 14.3 × 10−2 - Chemistry

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प्रश्न

Solve the following problem:

Write the following number in ordinary decimal form:

14.3 × 10−2

एका वाक्यात उत्तर
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उत्तर

14.3 × 10−2 = 0.143

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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. (O)(f) | 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.


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?


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.
  2. Determine the molality of chloroform in the water sample.

Calculate the molarity of a solution of ethanol in water in which the mole fraction of ethanol is 0.040 (assume the density of water to be one).


Why does the molarity of a solution depend upon temperature?


Solve the following problem:

Find out the molar mass of the following compounds:

Sodium carbonate, decahydrate (Na2CO3.10H2O)

(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:

3.75 × 10−1


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.

`((4xx10^-3)(9.9xx10^-7))/((789)(1.002xx10^-10)(0.3xx10^2))`


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

(3.26104) (1.54106)


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:

What weight of calcium oxide will be formed on heating 19.3 g of calcium carbonate?
(At. wt.: Ca = 40; C = 12; O = 16)


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.


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.

(i) What would you expect to see, if the ink contains three different coloured components?

(ii) Name the technique used by the child.

(iii) Suggest one more application of this technique.


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


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 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?


250 g solution of D-glucose in water contains 10.8% of carbon by weight. The molality of the solution is nearest to ______.

(Given: Atomic weights are H, 1u; C, 12u; O, 16u)


The molality of solution containing 15.20 g of urea, (molar mass = 60) dissolved in 150 g or water is ______.


Molarity is ______.


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