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calculate the percentage of copper [||] oxide in the impure sample
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asked
Oct 29, 2021
in
Chemistry Form 3
by
vokeh
0.5g of impure copper [||]oxide were reacted with 50cm³ of 0.1M HNO3. Calculate the percentage of the copper [||] oxide in the impure sample. (C=64.0,O=14.0,H=1.0)
nitrogen and its compounds
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Nov 27, 2021
by
Puotgiel
2CuO(s) + 4HNO3(aq) --> 2CU(NO3)2(aq) + 2H2O(l)
Mole of HNO3 in 50cm³ = (50cm³ × 0.1)/1000cm³
= 0.005moles
CuO : HNO3 = 2:4
Moles of CuO = 0.0025
RFM of CuO = 64 + 16= 80g/mole
Mass = 0.0025 × 80
Mass = 0.2g
0.2/0.5 × 100%
40%
Note: RAM of oxygen is 16 NOT '14'
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