Answer: Think and you will get it right!
Explanation:
To find the mass percent composition of an element, divide the mass contribution of the element by the total molecular mass. This number must then be multiplied by 100% to be expressed as a percent.
Normally for these types of questions (2 different situations), you can use:
P*V/T = P*V/T
As long as you don't confuse the different values up
Since V is constant, you can say that P/T (before heating up) = P/T (after heating up)
So 75000/295 = P/418
Answer:
i don't know
sorry i would help but i don't know
Explanation:
Physical! Because they do not modify the nature of the substance ( if you look at the chemical level) and it is reversible
Vapor is H20
Water is H20
Ice is H20
A chemical changes is not reversible
Burning wood for example! And the reactants interact together to form a new product.
