percent composition,moles

What is the percent by mass of sodium in NaCl?

• 39%
• 61%
• 35%
• 65%

Write .506 as a percent.

• 5.06%
• 506%
• 50.6%
• 500.6%

How many molecules are in 2.5 mol of NaCl?

• 1.50 x10²⁴ molecules

• 1.50 molecules

• 4.15 molecules

• 1.51 x10²⁴ molecules

Tags

NGSS.HS-PS1-7

How many particles are in a mole?

• 602
• 602 million
• 602 moles
• 6.02 x 10²³