You can eliminate A, C, and D almost instantly if you know that engineers are construction workers. The answer is B.
If I made no mistake in calculation, the given answer must be correct...(tried my best)
elements : carbon hydrogen oxygen Fluorine
composition [C] 24 3 16 57
M r 12 1 16 19
(divide C by Mr) 2 3 1 3
(Divide by smallest value) 2 3 1 3
(smallest value = 1...so all value remained constant)
Empirical formula : C2H3OF3
if molar mas = 100 g per mole, then
first step calculate Mr. of empirical formula: [= 100]
Them molecular formula = empirical formula
Answer:
CrO4 is the "chromate" ion and has a -2
since there are 2 and the overall charge of Mn(CrO4)2 is zero.. Mn is +4
O is -2 as it usually is...
so Cr is +6
It moves up and away from the pan, with the hottest particles
