Is it milk and nitrogen? Hope this helps!
Answer: difference in Vander Waals forces
Explanation:
The intermolecular force of attraction between the molecules in chlorine is WEAKER than that of Bromine.
This force is known as VANDER WAALS forces. And it DECREASES down the group; so Chlorine which is placed higher is a GAS, while Bromine placed lower in Group 7 is a LIQUID.
The mass numbers of the different isotopes of that element are averaged according to their respective abundances in nature.
The required is the amount of Sr(OH)2·8H2O needed to prepare a solution having a concentration of 0.100 M OH-. We start with the concentration of the hydroxide ion to determine the number of moles hydroxide ion for a given volume of 250.0 mL solution.
0.100 mol/L (0.250 L) = 0.4 mol hydroxide ion needed.
We know that, for every mole of Sr(OH)2·<span>8H2O in solution, two hydroxide ions is formed. Thus,
0.4 mol OH- ( 1 mol </span>Sr(OH)2·<span>8H2O / 2 mol OH-) ( 265.76 g / mol) = 53.152 g
Thus, 53.152 grams of </span>Sr(OH)2·<span>8H2O is needed to make a solution with 0.100 M OH-.</span>
Answer:
2,780,000mg
Explanation:
Using the Metric Staircase photo provided, you can calculate how many mg there are in 2.78 kg by simply moving the decimal point six places to the right, since the "Kilo" step takes six places to move to the "Milli" step.
2.78 kg
---------------
2 7 8 0 0 0 0 .
we can see that the decimal point is moved to the right six places.
Answer:
2,780,000mg
