The answer is C . when the light slows down
Answer: 41 atmosphere
Explanation:
Given that:
Volume of water V = 0.5 L
(since 1 liter = 1dm3
0.5L = 0.5dm3)
Temperature T = 500K
Pressure P = ?
Number of moles of gas = 5 moles
Note that Molar gas constant R is a constant with a value of 0.0082 ATM dm3 K-1 mol-1
Then, apply ideal gas equation
pV = nRT
p x 0.5dm3 = 5 moles x (0.0082 atm dm3 K-1 mol-1 x 500K)
p x 0.5dm3 = 20.5 atm dm3
p = (20.5 atm dm3 / 0.5dm3)
p = 41 atm
Thus, the gas is under a pressure of 41 atmosphere
Answer:
0.500 mol/dm³
Explanation:
Using the formula below;
CaVa = CbVb
Where;
Ca = concentration of acid (mol/dm³)
Cb = concentration of base (mol/dm³)
Va = volume of acid (cm³)
Vb = volume of base (cm³)
In accordance to the information provided in this question is;
Va = 5cm³
Vb = 250 cm³
Ca = 12 mol/dm³
Cb = ?
Using CaVa = CbVb
12 × 5 = Cb × 250
60 = 120Cb
Cb = 60/120
Cb = 0.500 mol/dm³
Fluorine.
Because:- Atoms want to become stable, for an atom to become stable, they need 8 valence electrons. Since Fluorine has 7 valence electrons, it only needs one more electron to become stable and have an octet. An octet is when an atom/element has 8 valence electrons. Since Fluorine will need to gain an electron, it will have a negative charge, and become an anion.
<span>H2C2O4(aq) + 2OH- --> C2O4^2- + 2H2O(l)</span>
