1 mole of butane
3 mole of ozone
4 mole of chlorine
7 mole of argon
Explanation
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Using the fastest method...
For Option A.
Butane C4H10 contains 14 atoms (i.e atoms of carbon and hydrogen amounts to 14)
multiplying the number of atoms with its mole = 1*14 = 14atoms
Option B..
Ozone is triatomic (i.e O3)
Number of atoms = 3atoms
3*3 = 9
Option C.
Chlorine molecule is a diatomic gas hence, having 2 atoms.
2*4 =8atoms
Option D
Argon being a noble gas is a monoatomic gas having just 1 atom
multiplying its atom with its mole,,, we have
1*7 = 7atoms...
and the question says with the least number of atom.........
The one with the least number of atom is D
OPTION D is very CORRECT...
Note::::this method should be used only in the exam hall when the time is ticking fast.....
Waiting for Corrections from scholars...
1 mole of any substance contains 6.02 * 10^23 atoms at s.t.p
So when we multiply the number of moles of each substance with above figures,that of butane is the least hence the ans is A
to calculate the number of atoms by each mole of the listed element one have to know the atomic mass of each element then calculate the mass number. The highest mass is said to me the one with the highest number of atoms since mass also contribute to number of atoms in an element
To determine which of the following gases contains the least number of atoms at standard temperature and pressure (s.t.p), we need to consider Avogadro's Law, which states that equal volumes of gases, at the same temperature and pressure, contain an equal number of molecules.
At s.t.p, one mole of any gas occupies 22.4 dm³. Therefore, the number of moles directly correlates with the number of molecules, and since we're dealing with atoms, we'll need to consider the atomicity of each gas (the number of atoms per molecule):
- **Butane (C₄H₁₀)**: 1 mole of butane has 4 carbon atoms and 10 hydrogen atoms, so it has \( 1 \times (4 + 10) = 14 \) atoms.
- **Ozone (O₃)**: 3 moles of ozone would have \( 3 \times 3 = 9 \) atoms.
- **Chlorine (Cl₂)**: 4 moles of chlorine would have \( 4 \times 2 = 8 \) atoms.
- **Argon (Ar)**: 7 moles of argon would have \( 7 \times 1 = 7 \) atoms, since argon is a noble gas and exists as single atoms.
Given this information, **7 moles of argon** would contain the least number of atoms, as argon is monatomic. Therefore, the correct answer is **D. 7 mole of argon**.
The answer is "D: 7 moles of argon." That's because argon is a monatomic gas, which means it only has one atom per molecule. The other gases are diatomic or polyatomic, which means they have more than one atom per molecule.
Pls review
1 mole of a substance=6.02*10^23
:. the higher the number of mole the higher the number of atoms. Thus correct answer is A...butane.
Number of atoms are not done by counting the atoms of each element present in a compound. Take it or leave.
The correct answer is D since argon is a noble gas, it doesn't need to have a molecule since it has octet configuration.
1 mole of any substance contains 6.02 * 10^23 atoms
So when we multiply the number of moles of each substance with above figures,that of butane is the least hence the ans is A
