chem

What is the percent by mass of oxygen in MgO?

• 20%
• 40%
• 50%
• 60%

What is the percent by mass of magnesium in MgO?

• 20%
• 40%
• 50%
• 60%

What is the percent by mass of sodium in NaCl?

• 39%
• 61%
• 35%
• 65%

Tags

NGSS.HS-PS1-7

What is the percent by mass of chlorine in NaCl?

• 39%
• 61%
• 35%
• 65%

Which element in the compound potassium cyanide, KCN, has a percent composition of 60.97%?

• K

• C

• N

• None of the above

Find the percent composition of Cu₂S?

• %Cu= 67.987 %S= 32.013
• %Cu= 79.854   %S= 20.145
• %Cu= 35.946   %S= 64.054

C₄H₆

• CH

• CH₃

• C₂H₃

• C₄H₆

Br₂O₆

• BrO₃

• Br₆O₂

• BrO

• Br₂O₆

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

C₂H₄

• CH

• CH₂

• C₄H₂

• C₂H₄

Tags

NGSS.MS-PS1-1

Hg₂Br₂

• HgBr

• Hg₂Br₂