What mass of Ni has as many atoms as there are N atoms in 63.0 g of NO₂?

• 8.24 x 10²³ atoms Ni
• 63.0 g Ni
• 80.4 g Ni
• 1.37 mol Ni

Tags

NGSS.HS-PS1-7

How many atoms are in a 3.56 g sample of Cu?

• 3.37 x 10²² Cu atoms
• 6.02 x 10²³ Cu atoms
• 0.056 Cu atoms
• 1 Cu atom

How many g of CaCO₃ are present in a sample if there are 4.52 x 10²⁴ atoms of carbon in that sample?

• 100 g CaCO₃
• 7.51 g CaCO₃
• 90.2 g CaCO₃
• 751 g CaCO₃

Tags

NGSS.HS-PS1-7

How many moles of oxygen atoms are contained in 2.50 mol of KMnO₄?

• 10.0 mol O atoms
• 2.50 mol O atoms
• 1.50 x 10²⁴ mol O atoms
• 0.625 mol O atoms

Tags

NGSS.HS-PS1-7

How many moles of argon atoms are present in 11.2 L of argon gas at STP?

• 250.88 mol Ar
• 0.500 mol Ar
• 2 mol Ar
• 1 mol Ar

How many oxygen molecules are in 3.36 L of oxygen gas at STP?

• 0.150 mol O₂
• 2.02 x 10²⁴ molecules O₂
• 2 molecules O₂
• 9.03 x 10²² molecules O₂

Find the mass in grams of 2.00 x 10²³ molecules of F₂.  

• 0.332 g
• 7.44 g
• 6.31 g
• 12.6 g

Tags

NGSS.HS-PS1-7

You have 8.65 x 10²⁵ atoms arsenic. How many grams do you have?

• 144 g As
• 10,765 g As
• 107 g As
• None of these

Tags

NGSS.HS-PS1-7

Calculate the number of atoms in 0.0340 g Zn.

• 5.200 x 10^-4 atoms Zn
• 3.130 x 10²³ atoms Zn
• 3.130 x 10²⁰ atoms Zn
• 1 atom Zn

Tags

NGSS.HS-PS1-7

Which has more atoms, 12.0 g of C or 12.0 g of Ca? 

• 12.0 g C
• 12.0 g Ca
• They are equal