Honors 3B Review (Mole and Stoich)

How many atoms are in 3.5 moles of arsenic atoms?

• 5.8 x 10^-24
• 7.5 x 10¹
• 2.1 x 10²⁴
• 1.7 x 10²³

How many moles of methane (CH₄) are in 1.24 x 10²³ molecules of methane?

• 6.02 x 10²³
• 7.46 x 10⁴⁶
• 978
• 0.206

What is the mass of one mole of aluminum?

• 27 g
• 13 g
• 54 g
• 14 g

Calculate the molar mass of Ba(C₂H₃O₂)₂

• 255.3 g/mol

• 237.3 g/mol

• 228.3 g/mol

• 196.3 g/mol

How many moles are in 19.82 g Mg? 

• 1.226mol Mg
• 481.7mol Mg
• 1.000mol Mg
•  0.8156 mol Mg

What is the mass in grams of 2.3456 moles of W?

• 431.22 grams

• 6.02 grams

• 207.2 grams

• 486.01 grams

Tags

NGSS.HS-PS1-7

What is the percent by mass of Carbon in sugar C₁₂H₂₂O₁₁ ?

• 144.0 %

• 42.1 %

• 12.01 %

• 342.0 %

A formula with the lowest whole # ratio of elements in a compound is called

• Molecular Formula
• Chemical Formula
• Empirical Formula 
• Distance Formula

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

•  NaPO2
• Na2PO3
• Na3PO4
• NaPO4

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇
• C₂H₄O₂ and C₆H₁₂O₆
• C₃H₆O₃ and C₂H₆O₂
• CH₄ and C₂H₆