Answer:
You need 8,324 g of CaCl₂ yo make this solution
Explanation:
Molarity is a way to express concentration in a solution, in units of moles of solute per liter of solution.
To know the grams of CaCl₂ it is necessary to know, first, the moles of this substance with the desired volume and concentration , thus:
0,1500 L × 
= 0,075 CaCl₂ moles
Now, with the molar mass of CaCl₂ you will obtain the necessary grams, thus:
0,075 CaCl₂ moles × 
= 8,324 g of CaCl₂
So, you need <em>8,324 g of CaCl₂</em> to make 150,0 mL of a 0,500M solution
I hope it helps!
<span>The Persian Wars mark an important turning point not only in Greek history but, indeed, in the course of all European civilization. First and foremost, because of its victory Greece was saved from the threat of external rule and could develop on its own. Handed this independence, the Greeks chose to follow a path which forever changed the course of modern life. Without their success in this conflict, they would, no doubt, never have had the liberty, means or conviction to invent, discover or create all they did: not just history but philosophy, science, drama, art, architecture, indeed most of the cornerstones of modern civilization.
Another consequence of this victory, less immediate but equally important, was that it prevented the Persians from dominating the lands to the west of Greece—as noted above, it's likely the fertile fields of Italy and Sicily, not the rough dust of Greece, were the real target of Xerxes' imperial designs—and there a tiny settlement called Rome had just begun to sprout, at that moment hardly a dot on the map, but it would later develop into a crucial player in the history of the West. Rome won freedom, too, in the Persian Wars, without ever fielding a single fighter. It's impossible to imagine how vastly different our world would be if Persia had conquered or exterminated the Romans before they'd ever had a chance to grow.
Thus, the Greeks laid the groundwork for later Western culture, and Herodotus the foundation for understanding it. If so many of his facts look suspect or even prove incorrect, if he sometimes seems to set speculation and scandal over sober criticism and science, before condemning him we should recall that he founded this entire enterprise called history, a discipline which still bears the name he gave it. His critics should also bear in mind it's only because Herodotus set us on this path that we can even scorn his methods in the first place. To this most uncommon "common man," we owe an enormous collective debt.</span>
6 is the fourth significant figures
if the number behind it is 5 or more then 5, you must add 1 to the number and ALL the number behind it will turn into 0
so that the answer is 42560
Answer:
Option D. 13.44
Explanation:
We'll begin by calculating the number of mole in 47.7g of copper(II) oxide, CuO.
This can be obtained as follow:
Mass of CuO = 47.7 g
Molar mass of CuO = 63.5 + 16 = 79.5 g/mol
Mole of CuO =.?
Mole = mass /Molar mass
Mole of CuO = 47.7/79.5
Mole of CuO = 0.6 mole
Next, we shall write the balanced equation for the reaction. This is given below:
CuO + H2 —> Cu + H2O
From the balanced equation above,
1 mole of CuO reacted with 1 mole of H2 to produce 1 mole of Cu and 1 mole of H2O.
Next, we shall determine the number of mole of H2 needed to react completely with 0.6 mole of CuO.
This can be obtained as follow:
From the balanced equation above,
1 mole of CuO reacted with 1 mole of H2.
Therefore, 0.6 mole of CuO will also react with 0.6 mole of H2.
Finally, we shall determine the volume occupied by 0.6 mole of H2 at STP.
This can be obtained as follow:
1 mole of H2 occupied 22.4 dm³ at STP.
Therefore, 0.6 mole of H2 will occupy = 0.6 × 22.4 = 13.44 dm³.
Therefore, 13.44 dm³ of H2 is needed for the reaction.
Solve the following equation and check for extraneous solutions. Show all work. Thank you.
sqrt(sqrt(x - 3)) = sqrt(x - 15)
