Stoichiometry Molecules

A sample of Sodium chloride (NaCl) has 5.7 x 10²⁴ formula units. How many moles of Sodium chloride are in the sample?

• 3.43 x 10²⁴ mol NaCl

• 34.3 x 10²³ mol NaCl

• 9.47 mol NaCl

• 333.1 mol NaCl

How many molecules of Carbon tetrachloride (CCl₄) are in 300 grams of CCl₄?

• 2.78 x 10²⁸ molecules CCl₄

• 3.24 x 10²² molecules CCl₄

• 1.174 x 10²⁴ molecules CCl₄

• 1.95 molecules CCl₄

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NGSS.HS-PS1-7

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NGSS.HS-PS1-7

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NGSS.HS-PS1-7

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NGSS.HS-PS1-7

• 6.02 x10²³ molecules

• 1.2 x 10²⁴ molecules

• 3.01 x 10²³ molecules

• 1.8 x 10²⁴ molecules

• none of the above

Answer explanation

1 mole of H₂ produces 1 mole of H₂SO₄, and 1 mole = 6.02 x10²³ molecules

Tags

NGSS.HS-PS1-7

• 6.02 x10²³ atoms

• 1.2 x 10²⁴ atoms

• 3.01 x 10²³ atoms

• 1.8 x 10²⁴ atoms

• none of the above

Answer explanation

1 mole of H_2, 1 mole = 6.02 x10²³ atoms but Hydrogen packs two atoms per molecule because it is diatomic. 2 atoms per molecule

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2

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NGSS.HS-PS1-7

Calculate how many moles of Ca in a 1.8 x10²⁴ particle sample of Ca?

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NGSS.HS-PS1-7

How many moles in 1.8 x10²⁴ particles of Ca?

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