Moles and Molar Mass

AP Chemistry· difficulty 2/5

How many oxygen atoms are in 0.25 mol of CO₂?

  • A

    3.0×10223.0 \times 10^{22}

  • B

    3.0×10233.0 \times 10^{23}

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  • C

    1.5×10231.5 \times 10^{23}

  • D

    6.0×10236.0 \times 10^{23}

Explanation

0.25 mol CO₂ × 2 O / molecule = 0.50 mol O atoms × 6.02×10236.02 \times 10^{23} = 3.01×10233.01 \times 10^{23}.

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