pmejaslerletazz pmejaslerletazz

19-07-2016
Chemistry

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How many atoms are in a sample of 68.7 grams copper (Cu)?

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daniel987 daniel987

19-07-2016

first find the moles of the substance: Moles = mass / RFM

moles = 68.7 /

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taskmasters taskmasters

20-07-2016

To find the number of atoms in the sample of copper, we need its atomic mass and the use of the Avogadro's number to find the equivalent units in terms of atoms.

68.7 g Cu ( 1 mol / 63.55 g ) ( 6.022 x 10^23 atoms / 1 mol ) = 6.51 x 10^23 atoms Cu

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