how do you calculate this question Kc question a?

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mr birling
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How much hydrogen cyanide is required to produce. 1.00 mol of the product if you start with 4.00 mol of propanone in 2dm3 of ethanol? Kc= 30.0 mol-1 dm3.
CH3COCH3 + HCN = CH3C(CN)(OH)CH3
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Hellllpppp
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I 4 X 0
C -1 -1 +1
E 3 X-1 1

I initial
C change
E equilibrium

Use moldm-3 in the kc equation dm3 =1 (on the word document) so moldm-3=mol

Kc= 1 / 3(x-1)
30 = 1/ 3x-3
90x – 90 = 1
90x =91
X = 1.01 mol
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