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Crank
2 years ago
8

If 3.66•10^23 molecules of a substance have a mass of 24.31g, what is the molar mass of the substance?

Chemistry
2 answers:
rosijanka [135]2 years ago
7 0

<u>Answer:</u>

Molar mass of substance = 40.0 g/mol

<u>Explanation:</u>

• First calculate the number of moles in 3.66 × 10²³ :

no. of moles = number of particles / Avogadro's Number

                     = (3.66 × 10²³)  /  (6.022 × 10²³)

                     = 0.6078 mol

• Now use the following equation to calculate the molar mass:

Molar mass = mass of substance / no. of moles

                   = 24.31 / 0.6078

                   = 40.0 g/mol

BlackZzzverrR [31]2 years ago
3 0
Answer is a I took the quiz
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A 1.0857 gram pure sample of a compound containing only carbon, hydrogen, and oxygen was burned in excess oxygen gas. 2.190 g of
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Answer:

  • C₂ H₄ O

Explanation:

<u>1) Mass of carbon (C) in 2.190 g of carbon dioxide (CO₂)</u>

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         x = (12.0107 g of C / 44.01 g of CO₂ ) × 2.190 g of CO₂ = 0.59767 g of C

<u />

<u>2) Mass of hydrogen (H) in 0.930 g of water (H₂O)</u>

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  • proportion: 2 × 1.00784 g of H / 18.01528 g of H₂O = x / 0.930 g of H₂O
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        x = ( 2 × 1.00784 g of H / 18.01528 g of H₂O) × 0.930 g of H₂O = 0.10406 g of H

<u>3) Mass of oxygen (O) in 1.0857 g of pure sample</u>

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Round to four decimals: Mass of O = 0.3840 g

<u>4) Mole calculations</u>

Divide the mass in grams of each element by its atomic mass:

  • C: 0.59767 g / 12.0107 g/mol = 0.04976 mol
  • H: 0.10406 g / 1.00784 g/mol = 0.10325 mol
  • O: 0.3840 g / 15.999 g/mol = 0.02400 mol

<u>5) Divide every amount by the smallest value (to find the mole ratios)</u>

  • C: 0.04976 mol / 0.02400 mol = 2.07 ≈ 2
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Thus the mole ratio is 2 : 4 : 1, and the empirical formula is:

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