A law in Chemistry ; the elements when arranged in the order of thier atomic numbers show periodic varation of the autmoic structure and of their most properties - Also know as the Mendeleev's Law
Im guesing D but if im not right im sorry i know it its just i dont remember?!
<u>Answer:</u> 0.5 moles of 
are produced in the reaction
<u>Explanation:</u>
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
......(1)
Given mass of 
= 113.6 g
Molar mass of = 79.5 g/mol
Plugging values in equation 1:
For the given chemical reaction:
By the stoichiometry of the reaction:
If 3 moles of produces 1 mole of
So, 1.43 moles of will produce = 
of
Hence, 0.5 moles of are produced in the reaction
Answer:
the equilibrium concentration of HF is 2.85 M
Option a) 2.85 M is the correct answer.
Explanation:
Given the data in the question;
H₂ + F₂ ⇄ 2HF
I 1.69 M 1.69 M 0
C -x -x +2x
E 1.69-x 1.69-x +2x
given that Kc = 115
Kc = [ HF ]² / [H₂][F₂]
we substitute
115 = [ 2x ]² / [ 1.69-x ][ 1.69-x ]
lets find the square root of both sides
10.7238 = 2x / [ 1.69-x ]
10.7238[ 1.69-x ] = 2x
18.123222 - 10.7238x = 2x
2x + 10.7238x = 18.123222
12.7238x = 18.123222
x = 18.123222 / 12.7238
x = 1.424356
Hence, equilibrium concentration of HF = 2x
that is;
HF = 2 × 1.424356
HF = 2.8487 ≈ 2.85 M
Therefore, the equilibrium concentration of HF is 2.85 M
Option a) 2.85 M is the correct answer.
