How many moles of aluminium are in 3.45 moles of pyrophyllite

Explanation:

You can see that in each molecule of Al2Si4O10(OH)2 there are 2 atoms of Al

so

moles Al = 2 x moles Al2Si4O10(OH)2

= 2 x 2.70 mol

= 5.40 moles of Al

the answer for sodium is 0.186

the answer for rubidium is 0.251

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )