Molality=number of moles of solute/mass of solvent in kg. no of moles of urea=mass/molarmass 3g/60=0.05moles. molality=0.05moles/0.25=0.2M
lily nekesa answered the question on November 18, 2017 at 13:28
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Name the first 10 elements of the periodic table of elements in their correct order.
(Solved)
Name the first 10 elements of the periodic table of elements in their correct order.
Date posted:
November 17, 2017
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Answers (1)
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The diagram below was used to prepare an alkane in the laboratory
(Solved)
The diagram below was used to prepare an alkane in the laboratory
(i)Write the formular of solid X
(ii)Explain why calcium oxide is added to the mixture above
(iii)Write a balanced equation for the reaction that occurs in the flask
Date posted:
November 16, 2017
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Answers (1)
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Study the set up below and answer questions below
(Solved)
Study the set up below and answer questions below
State and explain the observations that would be made when the circuit is completed.
Date posted:
November 16, 2017
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Answers (1)
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Starting with copper metal describe how a sample of crystals of copper 2 chloride may be prepared
(Solved)
Starting with copper metal describe how a sample of crystals of copper 2 chloride may be prepared
Date posted:
November 16, 2017
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Answers (1)
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Metals are ductile. Explain
(Solved)
Metals are ductile.Explain
Date posted:
November 15, 2017
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Answers (1)
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Explain the change in mass that occurs when solid copper(II)nitrate is heated in open crucible.
(Solved)
Explain the change in mass that occurs when solid copper(II)nitrate is heated in open crucible.
Date posted:
November 15, 2017
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Answers (1)
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State Bohr's assumptions to his model
(Solved)
State Bohr's assumptions to his model
Date posted:
November 12, 2017
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Answers (1)
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Which catalyst is used in experiment of manufacture of oxygen?
(Solved)
Chemistry
Date posted:
November 12, 2017
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Answers (1)
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Distinguish between anhydrous and hydrated salts.
(Solved)
Distinguish between anhydrous and hydrated salts.
Date posted:
November 12, 2017
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Answers (1)
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If an umbrella is touched with a finger on inner surface when it is raining it allows the rain water to leak through. Give a...
(Solved)
If an umbrella is touched with a finger on inner surface when it is raining it allows the rain water to leak through. Give a reason
Date posted:
November 12, 2017
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Answers (1)
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State two factors which determine the speed of photoelectrons emitted from a metal surface
(Solved)
State two factors which determine the speed of photoelectrons emitted from a metal surface
Date posted:
November 12, 2017
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Answers (1)
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State the main reason for electroplating metallic items.
(Solved)
State the main reason for electroplating metallic items.
Date posted:
November 12, 2017
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Answers (1)
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Crude oil is a source of many compounds that contain carbon and hydrogen only. (i) Name the process used to separate the components of crude...
(Solved)
Crude oil is a source of many compounds that contain carbon and hydrogen only.
i) Name the process used to separate the components of crude oil.
ii) On what two physical properties of the above components does the separation depend?
Date posted:
November 12, 2017
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Answers (1)
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During extraction of iron in the blast furnace, state the uses of the following in the furnace. (a) Molten slag (b) Waste gases leaving the...
(Solved)
During extraction of iron in the blast furnace, state the uses of the following in the furnace.
a) Molten slag
b) Waste gases leaving the furnace
c) Limestone
Date posted:
November 12, 2017
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Answers (1)
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What observation would be made if chlorine gas is bubbled through aqueous potassium iodide? Explain
(Solved)
What observation would be made if chlorine gas is bubbled through aqueous potassium iodide?
Explain
Date posted:
November 12, 2017
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Answers (1)
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An element in period 4 of the periodic table forms a basic oxide of formula P2O. (a) What is the valency of P ?
(Solved)
An element in period 4 of the periodic table forms a basic oxide of formula P2O.
a) What is the valency of P?
b) What name is given to the group of elements in which element P belongs
Date posted:
November 12, 2017
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Answers (1)
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An aqueous solution of hydrogen chloride gas reacts with manganese (IV) oxide to form chlorine gas while a solution of hydrogen chloride in methylbenzene does...
(Solved)
An aqueous solution of hydrogen chloride gas reacts with manganese (IV) oxide to form chlorine gas while a solution of hydrogen chloride in methylbenzene does not react with manganese (IV) oxide. Explain
Date posted:
November 12, 2017
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Answers (1)
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(a)Name the type of polymerization involved in forming Dacron (b)Give one advantage of synthetic fibres over natural fibres
(Solved)
a) Name the type of polymerization involved in forming Dacron
b) Give one advantage of synthetic fibres over natural fibres
Date posted:
November 12, 2017
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Answers (1)
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List two properties of (1)a good precipitating reagent (2)a good precipitate.
(Solved)
List two properties of (1)a good precipitating reagent (2)a good precipitate.
Date posted:
November 10, 2017
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Answers (1)
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Outline the steps of carrying out a Q-test.
(Solved)
Outline the steps of carrying out a Q-test.
Date posted:
November 10, 2017
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Answers (1)