Calculating Molar Mass Grade 9a

  • IUPAC
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| By Mohammad Sayaheen
Mohammad Sayaheen
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Quizzes Created: 2 | Total Attempts: 1,781
| Attempts: 277 | Questions: 5
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1. What is the molar mass of Carbon?

Explanation

The molar mass of a substance is determined by the average atomic mass according to the periodic table. The molar mass of carbon is 12.01 g/mol

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This quiz titled 'Calculating Molar Mass grade 9A' assesses knowledge on molar masses of various compounds including Carbon, Methane, Ammonium Carbonate, and more. It enhances understanding of molecular weights essential for chemistry students.

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2. What is the molar mass of CH4 (methane)?

Explanation

The molar mass of a substance is determined by the average atomic mass according to the periodic table. There is 1 carbon in CH4 (methane) and 4 hydrogen:
Carbon 1 (12.01) + Hydrogen 4(1.01) = 16.05 g/mol

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3. What is the molecular mass of Cu3(PO4)2?

Explanation

Molar mass is the mass of ONE mole of a substance regardless of how many moles there are in the equation. CAUTION: The parentheses indicates that everything within the parentheses is MULTIPLIED by the subscript outside of the parentheses.
This means there are 3 Coppers, 2 Phosphorus, 8 oxygen:
Copper 3 (63.55) + Phosphorus 2(30.97) + 8 (16.00) = 380.59 g/mol

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4. What is the molar mass of (NH4)2CO3 (Ammonium carbonate)?

Explanation

Molar mass is the mass of one mole of the substance. The molar mass of a substance is determined by the average atomic mass according to the periodic table. CAUTION: The parentheses indicates that everything within the parentheses is MULTIPLIED by the subscript outside of the parentheses. This means there are 2 nitrogen, 8 hydrogen (4 x 2), 1 carbon and 3 oxygen in this compound.
Nitrogen 2(14.01) + Hydrogen 8 (1.01) + Carbon 1 (12.01) + Oxygen 3(16.00) = 96.11 g/mol

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5. What is the molecular mass of Aluminum nitrate Al(NO3)3 from this equation: 2Al(s)   + 3Fe(NO3)2(aq)   à 3Fe(s)  + 2Al(NO3)3(aq)  

Explanation

(s) means solid and (aq) means aqueous.
Molar mass is the mass of ONE mole of a substance regardless of how many moles there are in the equation. So, ignore the “2” in front of Al(NO3)3
CAUTION: The parentheses indicates that everything within the parentheses is MULTIPLIED by the subscript outside of the parentheses.
This means there is 1 Aluminum, 3 Nitrogen, 9 oxygen (3 x 3)
The molar mass of a substance is determined by the average atomic mass according to the periodic table.
Aluminum 1 (26.98) + Nitrogen 3 (14.01) + Oxygen 9 (16.00) = 213.01 g/mol

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What is the molar mass of Carbon?
What is the molar mass of CH4 (methane)?
What is the molecular mass of Cu3(PO4)2?
What is the molar mass of (NH4)2CO3 (Ammonium carbonate)?
What is the molecular mass of Aluminum nitrate Al(NO3)3 from this...
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