Answer:
mass of calcium chloride = 290.49g
mass of water = 494.61 g
Explanation:
The percentage of calcium chloride in the mixture is 37.0%
It means in each 100g of mixture the mass of calcium chloride = 37.0 g
if the total mass of the mixture = 785.1 g
the mass of calcium chloride =
=
The mass of water = 785.1-290.49 = 494.61 grams
Answer:
number 1 I think
Explanation:
I did this at school but forgot
Most likely, exothermic processes are what cause the light that fireflies emit. because fuel and oxygen undergo a chemical process that produces carbon dioxide and water.
In thermochemistry, an exothermic process is one "for which the overall standard enthalpy change H is negative." Exothermic processes typically result in heat. A reaction for which the overall standard Gibbs energy change G is negative is what the term "reaction" according to the IUPAC means.
The exergonic response and the phrase are commonly mistaken. A very exothermic reaction will often accompany an exergonic reaction since "H" significantly contributes to "G." The majority of the remarkable chemical reactions presented in classrooms are exothermic and exergonic processes.
On the other hand, an endothermic reaction typically produces heat and is brought on by a rise in the entropy of the system.
Learn more about fireflies:
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Water is H2O. hydrogen atom is H1 O2
so hydrogen atom is H2
Answer:
The correct answer is - 10400 years.
Explanation:
Half-life an element is the time required to decay the half amount of the initial amount of the element.
Here, the initial amount n(i) = 100 gm
remained amount n(r) = 25 gm
then n =?
The formula for the calculating initial amount
n(i)=n(r)⋅2^n
n(i)=n(r)⋅2^n
n(i)/n(r) =2^n
puting value,
100/25 = 2^n
2^n = 4
n = 2
so to decay this amount there is two half life cycles involved,
Thus, time = 2*5700
= 10400 years.