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Thursday, April 9, 2009
Chemistry!
10. When sugar (Mr =342) is fermented using yeast, the following reaction takes place.
C12H22O11 + H2O à 4C2H5OH + 4CO2
What volume of carbon dioxide, at rtp, would be produced by the complete fermentation of 1 kg (1000g) of sugar?
[1000x4x24]/342
9. 2 CO(g) + O2(g) à 2 CO2(g)
20 cm3 of oxygen are reacted with 20 cm3 of carbon monoxide.
At the end of reaction, what are the volumes of gases remaining?
10cm3 oxygen, 0 cm3 carbon monoxide, 20 cm3 carbon dioxid
8. What is the maximum mass of Chromium, Cr, that can be extracted from 76g of chromium (III) oxide Cr2O3?
52g
*7. An element Z forms a hydride with formula ZH3. This hydride contains 91.2% of Z by mass. What is the relative atomic mass of Z?
31
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2:48 PM
