Answer:
I belive it's the black chair because they were asking which chair experienced the most force in the begining and the black chair had the most force given.
∆H for given reaction -847kJ
- As it's negative reaction is exothermic
So
2 mol of Al releases 847KJ heat
4 mol Al releases
∆H=-1694KJ
Answer:
53.29%
Explanation:
The molar mass of C2H4O2 is 60.05g and the 2 O's are 32.00g
so 32.00/60.05= 0.53288925895
and that as a decimal rounded to the nearest hundredths is 53.29%
Se - 78
Selenium - 78
or
78/34 Se2-
