Answer : The excess reagent is,
Explanation :
First we have to calculate the moles of and .
Now we have to calculate the limiting and excess reagent.
The balanced chemical reaction is,
From the balanced reaction we conclude that
As, 1 mole of react with 1 mole of
So, 0.068 moles of react with 0.068 moles of
From this we conclude that, the moles of are less than the NaCl. So, is a limiting reagent because it limits the formation of products and is an excess reagent.
Hence, the excess reagent is,
(1) the first shell
(2) the second shell
(3) the third shell
(4) the fourth shell
The valence electrons in an atom of phosphorus in the ground state are all found in IN THE THIRD SHELL.
Phosphorus has an atomic number of 15, therefore its electronic configuration is 2, 8, 5. This configuration implies that, phosphorus electrons are distributed in three different shells and the number of electrons in the outermost shell, which is the third shell, is 5. The ground state refers to a state, where the atoms of phosphorus are not excited. Electrons move away from their ground states when they are excited.
B. Isotopes of the same element have the same mass number and different atomic numbers.
C. Isotopes of the same element have the same number of neutrons and a different number of protons.
D. Isotopes of the same element have the same atomic number and different mass numbers.
D. Isotopes of the same element have the same atomic number and different mass numbers.
Answer: C. Isotopes of the same element have the same number of neutrons and a different number of protons.
Explanation: Founders Educere answer.
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B) NaCl(aq)
C) NaCl(g)
D) NaCl(ℓ)
NaCl(aq) is a homogeneous mixture. Hence, option B is correct.
A mixture is a substance that is made up of two or more substances that are not chemically combined and in fixed proportions.
Homogeneous mixtures are present with a similar uniform appearance and composition throughout. Examples are steel, air, salt water, etc.
Homogeneous mixtures may either be, a colloid or a solution.
An aqueous sodium chloride is a homogeneous mixture because NaCl completely dissolves in water, thus giving a single visible phase.
Hence, option B is correct.
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NaCl(aq) is a homogeneous mixture.
An aqueous sodium chloride is a homogeneous mixture because NaCl completely dissolves in water, thus giving a single visible phase.
Keywords: Mixtures, homogeneous mixture, Heterogeneous mixture
Level: High school
Subject: Chemistry
Topic: Mixtures and separation of mixtures
Sub-topic: Types of mixtures
A. The atomic mass could be used to convert that element into another element.
B. The atomic mass could be used to identify an element.
C. The atomic mass could be used to calculate the number of isotopes formed by the element.