Answer:
100 mL volumetric flask.
Explanation:
For preparation of any solution we generally use volumetric flask.
We will weigh the required amount of NaCl (based on calculation for 100 mL of 0.422 M NaCl) and will add this in a 100 mL volumetric flask.
There is only one mark in the volumetric flask.
So we will start adding water to it through wash bottle.
Then will continue stirring the solution to dissolve NaCl with addition of more amount of water (use funnel to add water).
Then finally we will make up the solution to 100 mL of mark.
Answer:
V = 22.86 L
Explanation:
Given data:
Mass of nitrogen dioxide = 45000 mg
Pressure = 1 atm
Temperature = 273 k
Volume = ?
Solution:
First of all we will convert the mass into moles.
<em>Number of moles = mass/ molar mass</em>
Number of moles <em>= </em>45 g/ 46 g/mol
Number of moles = 1.02 mol
Now we will determine the volume at STP.
PV = nRT
V = nRT/P
V = 1.02 mol × 0.0821 atm. mol⁻¹. k⁻¹. L× 273 k / 1 atm
V = 22.86 atm. L /1 atm
V = 22.86 L
Answer:
Potassium (K) and Fluorine (F)
Explanation:
A salt is formed with a metal and non-metal element from the periodic table of elements. if you look at the online ptable.com the upper right hand corner of each element shows the valence electrons for each element, and how many are in each shell for that element. Fluorine (F) has 7 valence electrons in its outer most shell, which means there is room for 1 more electron since the second shell can hold a max of 8. Potassium(K) has 1 electron in its outer most shell- which means is can fill in the 1 space available that fluorine has in its outer most shell. Since Potassium(K) is a metal and Fluorine(F) is a non-metal they can form an ionic compound, salt.