Answer:
6,41 min
Explanation:
For the reaction:
A → products
kinetics first-order reaction law is:
ln[A] = ln[A]₀ -kt
Where [A] is concentration of reactant, [A]₀ is initital concentration of reactant, k is rate constant and t is time.
If the concentration of A is 6,25% you can assume:
[A] = 6,25; [A]₀= 100. Replacing:
ln(6,25) = ln(100) -7,20×10⁻³s⁻¹t
-2,7726 = -7,20×10⁻³s⁻¹t
385s = t
In minutes:
385s×
= <em>6,41 min</em>
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I hope it helps!
The answer is B
hope this helps!!! have a great day
Answer:
9.1 KJ
Explanation:
We must first put down the reaction equation;
H2(g) + Br2(g) ----> 2HBr(g)
Secondly we find the number of moles of HBr involved;
number of moles of HBr= mass of HBr/ molar mass of HBr
But molar mass of HBr= 80.91 g/mol
Given mass of HBr as given in the question= 20.1g
Hence;
Number of moles of HBr= 20.1 g/80.91g
Number of moles of HBr= 0.25 moles of HBr
Lastly we calculate the heat transferred from the number of moles involved;
If 2 moles of HBr has a heat of formation of 72.80KJ
Then 0.25 moles of HBr will have a heat of formation of 0.25× 72.80/2= 9.1 KJ
Then; 20.1 g of HBr will have a heat of formation of 9.1 KJ
According to Bronsted-Lowry acid concept
an acid is a that donate a proton" and a base is a "proton acceptor."so
will look for that molecule to which <span><span>H2</span>O</span> "donates" <span>H+</span>to become <span>O<span>H−</span></span>. so answer will be..
. <span>N<span>H3</span>+<span>H2</span>O→N<span>H+4</span>+O<span>H<span>−
so correct option is NH3
hope it helps</span></span></span>
