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What are the different conjugations for avoir?

AVOIR = TO HAVE Present - eg. I have j'ai tu as il/elle/on a nous avons vous avez ils/elles ont Past eg. I had j'ai eu tu as eu il/elle/on a eu nous avons eu vous avez eu ils/elles ont eu Imperfect eg. I use...
EH
Answered by Emma H. • French tutor
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Aspirin C9H8O4 is made when salicylic acid C7H6O3 reacts with ethanoic anhydride C4H6O3 . The equation for this reaction is: C7H6O3 + C4H6O3 → C9H8O4 + CH3COOH Calculate the maximum mass of aspirin that could be made from 100 g of salicylic acid.

A relevant equation is: mass = moles x relative formula mass Also written: m = n*M r This reaction is a 1:1 ratio of salicylic acid to aspirin, meaning 1 mole of salicylic acid makes a maximum of 1 mole of a...
EH
Answered by Emma H. • Chemistry tutor
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What mass of carbon dioxide is produced from burning 100 grams of ethanol in oxygen according to this reaction: C2H5OH + 3 O2 --> 2 CO2 + 3 H2O

When approaching a question like this I always find it easier to write out the equation with the known quantities written underneath each individual compound. This allows us to easily check whether the equat...
KM
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Q: How to solve the simultaneous equations 3x+2y=7 and 5x+y=14

When solving simultaneous equations you are aiming to use both equations together to find out the value of x and y for values that with ‘fit’ in each equation. 3x + 2y = 7 5x + y = 14 If we subtract these eq...
KM
Answered by Katherine M. • Maths tutor
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What is the difference between the aorist tense and the perfect tense?

The aorist tense in Greek represents a single and complete action in the past. The perfect tense represents a past action which still affects the present - the aorist has no affect on the present. For exampl...
GC
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