JT's answer to Rosie's Secondary 3 A Maths Singapore question.
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Things to take note:
1. Question reads "liquid octane/ ethanol" so their state symbols are given
2. Water vapour is formed so be careful not to assign state symbol (l), when it should be (g)
3. The number of C in octane or ethanol determines the coefficient (no. in front) of carbon dioxide. Example, C2H5OH - since there are 2 C, 2 CO2 is formed.
4. Balance C, then H. Calculate total number of O on right hand side and balance by placing number in front of O2.
All the best!
1. Question reads "liquid octane/ ethanol" so their state symbols are given
2. Water vapour is formed so be careful not to assign state symbol (l), when it should be (g)
3. The number of C in octane or ethanol determines the coefficient (no. in front) of carbon dioxide. Example, C2H5OH - since there are 2 C, 2 CO2 is formed.
4. Balance C, then H. Calculate total number of O on right hand side and balance by placing number in front of O2.
All the best!
Date Posted:
11 months ago
oh I see thank you sm!
hello, do you have any idea of how to do B?
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