First question: Periodicity (I think that's what it's called) isn't in the course anymore so I probably don't have the full answer (or perhaps it's not even correct) to this, but I'll do my best. Basically, the periodic table isn't arranged in order of increasing molar masses. Sure, there's a pattern to it, but as with all sciences, there are always trends, but there are also usually exceptions to these trends. The periodic table is arranged in order of the number of protons an element has, and it just happens that in this case, although Te is heavier, it has a lower number of protons, so it will be placed before 'I'. I can't answer this fully because I'm not sure what all the factors are that contribute to molar mass however, I'm assuming its a case of neutrons here where on average, Te has more neutrons than I, since the relative molar masses given on the periodic tables are averages.
Second question:
The volume and mol of gas are remaining constant, so use the following formula:
Third question: First write the two combustion equations.
Because there is 45L of fuel, and three quarters is octane, then that means 33.75 L is octane, and 11.25 L is nonane. Also, note that because the conditions are remaining constant, and because
amount and volume are directly proportional, we can say that;
=8V(C_8 H_{18})=270 L)
=9V(C_9 H_{20})=101.25 L)
Add these together to get 371.25 L of carbon dioxide.
And thanks for the offer but I won't be tutoring chemistry =P Check the tutoring forum, there's quite a few quality chem tutors there already. Shivesh (shiveshvarmaxD) and Collin (coblin) are probably the first two that come to mind, and I haven't really heard any complaints about either of them.
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