IB Chemistry Structure 1.4.1-1.4.4

What is the Molar Mass of Platinum (Pt)?

• 195.08 g/mol

• 78 g/mol

• 106.4 g/mol

• 145 g/mol

Tags

NGSS.HS-PS1-1

What is the molar mass of C₂H₄O₂?

• 40g
• 50g
• 60g
• 68g

How many molecules are present in 25 g of NaBr?

• 102.96 molecules
• 0.24 molecules
• 1.45x10²³ molecules
• 2.34 x 10²⁰molecules

Tags

NGSS.HS-PS1-7

How many moles are there in 12.7g of CaF₂?

• 0.20 mol
• 1,000.76 mol
• 6.14 mol
• 0.16 mol

Tags

NGSS.HS-PS1-7

How many moles are in 4.5x10²⁴ particles?

• 0.747 particles
• 0.747 mol
• 2.71x10⁴⁷ mol
• 2.71x10⁴⁷ particles

If the empirical formula for a sugar is CH₂O, what is a possible molecular formula for that sugar?

• C₆H₁₂O₆
• C₂H₂O₂
• CH₄O
• none of the above

What is the empirical formula of a compound if the molecular formula is W₁₈O₉?

• W₁₈O₉
• W₂O
• W₆O₃
• none of the above

Which of the following represents an empirical formula?

• H₂O₂
• HC₂O₄
• H₂O₆
• H₁₂O₄₈

How many molecules would be in 8.4 moles of Octane (C₈H₁₈)?

• 5.77 x 10²³

• 5.04 x 10²⁴

• 5.77 x 10²⁶

• 5.04 x 10²³

The total number of molecules in 34.0 grams of NH₃ is equal to 

• 1.00 x 22.4
• 2.00 x 22.4
• 1.00 (6.02 x 10²³)
• 2.00 (6.02 x 10²³)