CuSO4 + 5H20 .... I have 8.1 x 10 to the power of -3 gram of this, how do i find the number of oxygen atoms?

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CuSO4 + 5H20 .... I have 8.1 x 10 to the power of -3 gram of this, how do i find the number of oxygen atoms?

Number of moles = mass/mr
I remember something about this.

2007-03-19 02:53:37 · 1 answers · asked by David L 1 in Science & Mathematics ➔ Chemistry

1 answers

the molar mass of CuSO4,5H2O is 63.5+32+64+5*18 =249.5g

8.1*10^-3 = 8.1*10^p3/249.5 =3.2460^-5mole

this corresponds to 3.246*6.0210^23 molecules

and each molecule has 9 atoms of oxygen
3.246*6.0210^23 *9 atoms oxygen

1.76 10^20 atoms oxygen

2007-03-19 03:01:44 · answer #1 · answered by maussy 7 · 0⤊ 0⤋