Answer:
Valency is defined as the number of hydrogen atoms which combine directly or indirectly with one atom of an element.
Example:
One atom of nitrogen combines with three atoms of hydrogen to form ammonia gas. So, the valency of nitrogen is 3.
Answer:
t = 21.5 min.
Explanation:
Hello!
In this case, since the kinetics of a first-order reaction is:
![\frac{[A]}{[A]_0}=exp(-kt)](https://tex.z-dn.net/?f=%5Cfrac%7B%5BA%5D%7D%7B%5BA%5D_0%7D%3Dexp%28-kt%29)
Thus, since we are given the 11.7 min for a 58.6-% consumption, we can compute the rate constant, k:
Now, for the second problem, as the new consumption is 80.2%, we can compute the required time as shown below:
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Answer:
The middle, or the transitional metals
Explanation:
When naming elements, we use roman numerals to indicate what their charge is. The charge of an element is affected by their number of valence electrons (outermost electrons).
Transitional metals are generally <u>multivalent</u>, meaning that element has more than one possible number of valence electrons. This makes them have more than one possible charge. Roman numerals indicate which charge of that element is used/discussed.
1.0 mole of gas at STP occupies 22.4 Litres.
4/0L / 22.4 L/mole = 0.179 moles He.
