A mole of carbon dioxide contains 6.02 x 10²³ _____.

• atoms
• formula units
• ions
• molecules

How many molecules are there in 31.8 moles of water?

• 5.28 x 10^-23 molecules
• 1.91 x 10²⁵ molecules
• 5.28x 10-²⁵
• 1.91 x 10²²

How many moles of copper are 4.57 x 10¹³ atoms of copper?

• 7.59 x 10^-11 moles
• 2.75 x 10³⁷ moles
• 7.59 x 10¹¹ moles
• 2.75 x 10³³ moles

Tags

NGSS.HS-PS1-7

Determine the number of
atoms in
2.50 moles of zinc.

• 1.51 x 10²⁴ atoms
• 4.15 x 10^-24 atoms
• 2.71 x 10^-22 atoms
• 163 atoms

Tags

NGSS.HS-PS1-7

How many moles of sulfur atoms are there in 5.0 g of sulfur?

• 160 mol
• 8.3 x 10^-24 mol
• 0.16 mol
• 2.7 x 10^-22 mol

A sample of AlCl₃ contains a total of 4.515 x 10²⁷ atoms of chlorine. What must be the mass of this sample?

• 2.500 x 10⁵ g

• 1.000 x 10⁶ g

• 18.75 g

• 3.333 x 10⁵ g

how many atoms are contained in a 456 g sample of carbon dioxide?

• 10.34 atoms

• 6.237 x 10²⁴ atoms

• 1.871 x 10²⁵atoms

• 2.079 x 10²⁴ atoms

Tags

NGSS.HS-PS1-7

Which of the following gases occupies 12 dm³ at room temperature and pressure?

• 4 g of helium

• 16 g of oxygen

• 20 g of neon

• 44 g of carbon dioxide

260 g of hydrated cobalt(II) chloride contains 118 g of water of crystallisation. What is the molecular formula of the compound?

• CoCl₂.2H₂O

• CoCl₂.3H₂O

• CoCl₂.6H₂O

• CoCl₂.12H₂O

0.8 g of sodium hydroxide is dissolved to form a 250 cm³ aqueous solution. What is the concentration of this solution?

• 0.02 mol/dm³

• 0.04 mol/dm³

• 0.08 mol/dm³

• 0.80 mol/dm³