6 1L d'air pèse environ 1,3 g. La masse moyenne d'une des molécules qui
le constituent est environ 25 x 10-24 g.
Calculer le nombre N de molécules contenues dans un litre
d'air.

1. is 4 and 2. is 3

step-by-step explanation:

so if you look at the first one you see that 1 is to 4 and 2 is to 8 and so on, so you can see for every 1 there is a times 4 so if it were 3 then it would be 3*4 and it is 12

for number 2 it is 3 because 1 is to 3 and 2 is to 6 so for every 1 there is 3 so if it were 3 then there would be 3*3 = 9

what are the statements

step-by-step explanation:

99

step-by-step explanation: