Which of the following electron configurations for neutral atoms is correct?
2 answers:
Answer : The correct option is argon.
Explanation :
Neutral atom : It is defined as an atom has equal number of electrons and protons.
- The given electronic configuration of magnesium is,
The atomic number of magnesium is 12 that means it has 12 number of protons and 12 number of electrons.
As per given electronic configuration, there are 18 electrons are present in magnesium which is the electronic configuration of argon. So, this is not a neutral atom.
- The given electronic configuration of argon is,
The atomic number of argon is 18 that means it has 18 number of protons and 18 number of electrons. So, this is a neutral atom.
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Answer:
103.9 g
Explanation:
- C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
First <u>we convert 54.0 g of propane (C₃H₈) into moles</u>, using its <em>molar mass</em>:
- 54.0 g ÷ 44 g/mol = 1.23 mol C₃H₈
Then we <u>convert 1.23 moles of C₃H₈ into moles of CO₂</u>, using the <em>stoichiometric coefficients</em>:
- 1.23 mol C₃H₈ *
= 3.69 mol CO₂
We <u>convert 3.69 moles of CO₂ into grams</u>, using its <em>molar mass</em>:
- 3.69 mol CO₂ * 44 g/mol = 162.36 g
And <u>apply the given yield</u>:
- 162.36 g * 64.0/100 = 103.9 g