Answer:
O H C
Moles in 100g 3.33 6.65 3.33
Ratio 1.00 2.00 1.00
Possible empirical formula = 
Answer:
1. Not to have enough salt water on the foil
2.not cleaning the foil well to remove interfering materials
The solution for problem 36 is in the picture attached. I am 80% sure it’s correct.
Answer:
690 g IrI₃
Explanation:
To convert from moles to grams, you have to use the molar mass of the compound. The molar mass of IrI₃ is 572.92 g/mol. You use this as the unit converter in this equation:

Round to the lowest number of significant figures which is 2 to get 690 g IrI₃.
The gravitational force between the objects depends on the mass of the objects and the distance between them.