How many molecules (not moles) of nh3 are produced from 6.62×10−4 g of h2?
Answers
NH₃ = 17.0 g/mol
14 g N₂ ---------------> 2 x 17 g NH₃
6.62 x 10⁻⁴ g --------> ?
Mass NH₃ = ( 6.62 x 10⁻⁴ ) x 2 x 17 / 14
Mass NH₃ = 0.022508 / 14
Mass NH₃ = 0.00160 g
number of moles = 0.00160 / 17 = 9.41 x 10⁻⁵ moles
1 mole ----------------------- 6.02 x 10²³ molecules
9.41 x 10⁻⁵ moles ---------- ?
molecules NH₃ = ( 9.41 x 10⁻⁵ ) x ( 6.02 x 10²³ ) / 1
= 5.66 x 10¹⁹ molecules of NH₃
hope this helps!
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An experimental procedure requires 10 ml of acid to be dissolved into a beaker of water. An additional 5 ml of acid is added to the solution. Which statement best describes the new solution?
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(2) the relative abundance of each naturally occurring isotope of chlorine, only
(3) the atomic mass and the relative abundance of each naturally occurring isotope of chlorine
(4) the atomic mass and the relative abundance of each naturally occurring and artificially produced isotope of chlorine
Answers
Answer is: (3) the atomic mass and the relative abundance of each naturally occurring isotope of chlorine.
m(³⁵Cl) = 34.97 amu; the average atomic mass of chlorine-35.
m(³⁷Cl) = 36.97 amu; the average atomic massof chlorine-37.
ω(³⁵Cl) = 75.76% ÷ 100% = 0.7576; fractional abudance of chlorine-35.
ω(³⁷Cl) = 24.24% ÷ 100% = 0.2424; fractional abudance of chlorine-37.
m(Cl) = m(³⁵Cl) · ω(³⁵Cl) + m(³⁷Cl) · ω(³⁷Cl).
m(Cl) = 34.97 amu · 0.7576 + 36.97 amu · 0.2424.
m(Cl) = 35.4548 amu; average atomic mass of chlorine.
Final answer:
The atomic mass of chlorine is determined by both the atomic mass and the relative abundance of each naturally occurring isotope of chlorine. It's based on an average of the masses of the isotopes according to their relative abundance.
Explanation:
To determine the atomic mass of the element chlorine, option (3), both the atomic mass and the relative abundance of each naturally occurring isotope of chlorine is required. The atomic mass of chlorine is not just the mass of one particular atom, or isotope; instead, it's an average of the masses for all the isotopes according to their relative abundance. For instance, Chlorine has two isotopes Chlorine-35 and Chlorine-37. If the relative abundance of Chlorine-35 is 75% and that of Chlorine-37 is 25%, the atomic mass is calculated by the formula [(0.75 x 35) + (0.25 x 37)].
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Answers
Answer: Na has a ground-state electronic configuration of 1s2 2s2 2p6 3s1. Removing the 3s electron leaves us with the noble gas configuration 1s2 so a sodium ion is Na+.
Explanation: I HOPE THAT HELPED!
Final answer:
The ground state electron configuration for sodium (Na) is 1s²2s²2p63s¹. The electron in the outermost shell (3s orbital) is the valence electron, with the rest being core electrons. It can be abbreviated as [Ne]3s¹.
Explanation:
The ground state electron configuration for sodium (Na), an alkali metal with atomic number 11, is 1s²2s²2p63s¹. This configuration includes one electron in the outermost shell, or 3s orbital, and the rest in the core electron shells. To abbreviate this, we look at the noble gas that matches the core configuration, in this case neon (Ne), and the configuration becomes [Ne]3s¹. The outermost electron, in the 3s orbital, is known as a valence electron, while the others are core electrons.
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b. False
Answers
Answer: The given statement is false.
Explanation:
A chemical reaction is a reaction which brings change in chemical composition of reactants resulting in formation of new compounds which have different chemical properties.
For example,
So, when gas is produced in a chemical reaction then it means new compounds are formed due to breakage of old bonds and formation of new bonds.
Thus, we can conclude that the given statement gas produced from a reaction is a phase change and not a chemical change, is false.
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(2) proton-to-neutron ratio in an atom of gold
(3) nature of the bonds between gold atoms
(4) reactively of gold atoms
Answers
The malleability of gold is due to the nature of the bonds between gold atoms and the reactivity of gold atoms.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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However, (3), the nature of bonds between gold atoms also allows for the metal to be flattened, as metallic bonds aren't amazingly strong, and allow for metals to bend. This is what makes pure metals so weak, and why we use alloys.
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