Some Basic Concepts of Chemistry Mole Concept

How many moles are 98.3 grams of aluminum hydroxide, Al(OH)₃?

• 1.26 moles
• 0.8 moles
• 7,673.4 moles
• 150 moles

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Convert 25 g of NaBr to molecules

• 102.96 molecules

• 0.24 molecules

• 1.45x10²³ molecules

• 2.34 x 10²⁰molecules

What is the molar mass of NaCl?

• 58.45g/mol

• 28g/mol

• 12g/mol

• 6.02 x 10²³

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NGSS.HS-PS1-7

Which of the following statement are true about the formula of dinitrogen monoxide, N₂O?

• The relative molecular mass is 28.

• One molecule of N₂O consists of one nitrogen atom and one oxygen atom.

• One mole of N₂O contains 6.02 x 10²³ atoms of nitrogen.

• One mole of N₂O consists of two mole of nitrogen atom and one mole of oxygen atom.

Identify the number of Chlorine atoms in 65.8 g CaCl_2.

• 7.14 x 10²³ atoms

• 8.71 x 10²³ atoms

• 1.22 x 10²³ atoms

• 3.57 x 10²³ atoms

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NGSS.HS-PS1-7

Determine the number of moles of Na₂CrO₄ that contain 4.33 x 10²⁴ oxygen atoms.

• 7.19 mol

• 6.77 mol

• 1.80 mol

• 64.00 mol

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NGSS.HS-PS1-7

Which has more molecules?

• 1 mole H₂O
• 1 mole Al(OH)₃
• 1 mole NaCl
• There are all the same

What is the molar mass of one molecule of Nitrogen N₂?

• 14.01 amu
• 14.01 g
• 28.02 g
• 28.02 amu

Tags

NGSS.HS-PS1-7

Find the Molar Mass of:
Ga₂(SO₃)₃

• 280 g/mol
• 400 g/mol
• 380 g/mol
• 480 g/mol

88.0 grams of CO₂ is about _____________. [Select 3 answers.]

• 1 mole of CO₂

• 2 moles of CO₂

• 6.02 x 10²³ molecules of CO₂

• two times 6.02 x 10²³ molecules of CO₂

• 2 moles of carbon atoms and 4 moles of oxygen atoms

Tags

NGSS.HS-PS1-7