Moles2-community

Which compound has the smallest molar mass?

• CO
• CO₂
• H₂O
• H₂O₂

How many moles are in 16.94g of water?

• 16.94 mol H₂O
• 0.9401 mol H₂O
• 305.3 mol H₂O
• 1.063 mol H₂O

Tags

NGSS.HS-PS1-7

Balance the following reaction :
 
CaC₂(s)   +   H₂O(l)   -->   C₂H₂(g)   +   Ca(OH)₂(aq)

• 1,2,2,2
• 1,2,1,1
• 2,1,1,1
• 2,1,2,1

Tags

NGSS.HS-PS1-7

What is the mole used for? 

• To measure the amount of grams in a substance
• To measure the amount of atoms or molecules in a substance
• To measure the amount of energy in a substance
• To measure the amount of bonding in a substance 

What is Avogadro's Number? 

• 6.02 x 10²³
• - 6.02 10²³
• 6.02 x 10²²
• 6,020,000,000,000

Tags

NGSS.HS-PS1-7

What is the molar mass of Al₂(CO₃)₃

• 234 g/mol
• 138 g/mol
• 210 g/mol
• 222 g/mol

Find the percent composition of hydrogen in (NH₄)₂S.

• 11.8%
• 41.1%
• 47.1%

What is the mass in grams of 5.90 mol C₈H_18?

• .0512 g
• 19.4 g
• 673 g
• 389 g

Tags

NGSS.HS-PS1-7

Find the number of moles in 30 grams of H₃PO₄

• 30 mol H₃PO₄
• 0.31 mol H₃PO₄
• 97 mol H₃PO₄
• 3.26 mol H₃PO₄

Tags

NGSS.HS-PS1-7

Find the percent composition Copper in Cu₂S?

• %Cu= 67.987

• %Cu= 79.854

• %Cu= 35.946