Answer:
B
Explanation:
A chemical reaction equation is balanced if the number of atoms of each element on the right hand side of the reaction equation is the same as the number of atoms of the same element on the left hand side of the reaction equation.
By inspection, the chemical reaction written in the question is a balanced chemical reaction equation.
However, the statement in option B that more molecules of N2 are needed to produce NH3 than molecules of H2 is a false statement since only one mole of N2 and three moles of H2 are required to produce NH3 according to the reaction equation as written in the question.
Because 25% is half of 0.5 and the half life of 
is given as 5,715, the time it takes to reach this amount should just be double the half life: 11430 years.
However, in other cases the problem may not have easy numbers, so below is a more mathematical approach.
The half life formula is 
.
Solving for t gives:
Given information:
Plug in given values and solve for t.
With correct significant figures, this would be 11000 years.
Explanation:
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The number of millimoles of solute per liter of water is used to express the osmotic concentration of a solution, also known as Molarity.
What is Molarity?
It is a measure of the concentration of a chemical species, in particular of a solute in a solution. In terms of the number, it is a substance per unit volume of solution. In chemistry, the most commonly used unit for the term molarity is the number of moles per liter.
To know more about Molarity go to the given link :
brainly.com/question/14514656
