Answer:
Volume of water added = 2.0 L
Explanation:
Initial pH of the solution = 2.7
[H^+] concentration in 2 L solution of sulfuric acid,
![pH = -log[H^+]](https://tex.z-dn.net/?f=pH%20%3D%20-log%5BH%5E%2B%5D)
![[H^+] = 10^{-pH}\ M](https://tex.z-dn.net/?f=%5BH%5E%2B%5D%20%3D%2010%5E%7B-pH%7D%5C%20M)
![[H^+] = 10^{-2.7} = 0.001995\ M = 0.002\ M](https://tex.z-dn.net/?f=%5BH%5E%2B%5D%20%3D%2010%5E%7B-2.7%7D%20%3D%200.001995%5C%20M%20%3D%200.002%5C%20M)
Final pH of the solution = 3
Final [H^+] concentration of sulfuric acid,
![[H^+] = 10^{-pH}\ M](https://tex.z-dn.net/?f=%5BH%5E%2B%5D%20%3D%2010%5E%7B-pH%7D%5C%20M)
![[H^+] = 10^{-3} = 0.001\ M](https://tex.z-dn.net/?f=%5BH%5E%2B%5D%20%3D%2010%5E%7B-3%7D%20%3D%200.001%5C%20M)
Now,



Volume added = Final volume - Initial volume
= 4.0 - 2.0 = 2.0 L
Answer:
D. N₂O
Explanation:
Let's assume we have 100 g of the compound. That means it consists of 63.61 grams of nitrogen and 36.69 grams of oxygen.
Converting masses to moles:
63.61 g N × (1 mol N / 14.01 g N) = 4.540 mol N
36.69 g O × (1 mol O / 16.00 g O) = 2.293 mol O
Normalize by dividing by the smallest:
4.540 / 2.293 = 1.980 mol N
2.293 / 2.293 = 1.000 mol O
So there is approximately twice as many N atoms as O atoms. The empirical formula is therefore N₂O.
Answer:
16.791 grams
Explanation:
The density formula is:

Rearrange the formula for m, the mass. Multiply both sides of the equation by v.


The mass of the gold nugget can be found by multiplying the density and volume. The density is 19.3 grams per cubic centimeter and the volume is 0.87 cubic centimeters.

Substitute the values into the formula.


Multiply. Note that the cubic centimeters, or cm³ will cancel each other out.


The mass of the gold nugget is 16.791 grams.
Interactions to an organism can be both harmful and beneficial due to the organism's circumstances. For example by adding tadpoles to an eco system it results in the tadpoles eating all the food thus killing the other organisms. Whereas by adding plants to an ecosystem it provides shelter for the organisms and possibly food being beneficial.