Choose the answer to the algebraic equation below that has the correct number of
ID: 1075026 • Letter: C
Question
Choose the answer to the algebraic equation below that has the correct number of significant figures:
(1.47x103-6.23x102)(2.12x104) / 1.73
( c is wrong why )
a) 1x 107
b)1.0 x107
c) 1.0379x107
e)1.03794x107
The main ingredient in antifreeze is known as ethylene glycol, and has molecular formula of CH2OHCH2OH. The empirical formula of ethylene glycol is __.
(d is wrong why and which is correct)
a) C2H3O
b) CH6O2
c)CH2O
d) C2H6O2
e) CH3O
a 22.5 g sample of ammonium carbonate, (NH4)2CO3, contains __ Mol of ammonium ions.
(D is wrong why and which is correct)
a) 0.468
b) 0.288
c) 0.234
D)2.14
E) 3.47
Explanation / Answer
Ans 1
= (1.47x10^3 - 6.23x10^2) x (2.12x10^4) / (1.73)
= 10379421.965
= 1.0379421965 x 10^7
The more the significant figures, the better the answer is correct
Between C and e options e has more significant figures than c
So the correct answer would be e ( not C)
If e does not exist in the options then C would be the correct answer