Answer:
planets,meteoroids and asteroids
Explanation:
You use the equation M1V1=M2V2 for dilution problems
(250)3=.5x
x= 1500 mL
F2 means that there are two flourine's usually a gas is a diatomic molecule.
Since a fluorine molecule has an atomic mass of 18.998 that molar mass of F2 would be 18.9998 *2 = 37.996 except in molar mass the units change so instead of being g/mol it would just be grams.
so 37.996 grams
hope this helps!
(:
Answer:
Approximately
(note that
.)
Explanation:
The molarity of a solution gives the number of moles of solute in each unit volume of the solution. In this
solution in water,
Let
be the number of moles of the solute in the whole solution. Let
represent the volume of that solution. The formula for the molarity
of that solution is:
.
In this question, the volume of the solution is known to be
. That's
in standard units. What needs to be found is
, the number of moles of
in that solution.
The molar mass (formula mass) of a compound gives the mass of each mole of units of this compound. For example, the molar mass of
is
means that the mass of one mole of
.
For this question,
.
Calculate the molarity of this solution:
.
Note that
(one mole per liter solution) is the same as
.
The correct answer is indeed Arsenic (As). This is the element that fits the description of being in period 4 and group 5, just like Krypton and Nitrogen.