Answer:
0.906 gm/l
Explanation:
We know that molarity of the a solution is given by,
, where 'M' is the molarity, 'w' is the weight of the sample, 'm' is the molar mass, and 'v' is the volume of the solution.
Molarity of a solution tells us the concentration of the solute in the solvent.
Molar mass of KCl is = 74.55
Putting the values we get,
![M = \frac{16.9}{74.55} \times \frac{1000}{250}=0.906 gm/l](https://tex.z-dn.net/?f=M%20%3D%20%5Cfrac%7B16.9%7D%7B74.55%7D%20%5Ctimes%20%5Cfrac%7B1000%7D%7B250%7D%3D0.906%20gm%2Fl)
So the molarity of KCl solution is 0.906 gm/l.
You will use the formula PV=nRT
P = pressure
V = volume
n = moles
R = gas constant
T = Temperature
Since 21.4g of Ar (Argon) is given this will be divided by the molar mass of Ar to give you the number of moles. Mass of Ar is 40g so
21.4g/40g = 0.54 moles of Argon
Then you just change Celsius to Kelvin by adding 273 to 12.5 which will be
12.5 + 273 = 285.5 K
(The formula for changing C to K is
X°C + 273 = K)
Now with moles and temperature in K you can plug all your values into PV=nRT to find volume so
(1.25atm)V = (0.54moles)(0.0821)(285.5K)
(0.0821 is the gas constant R when using atm, Liters, moles, and kelvin; this should always be given by your teacher)
Multiply
1.25v= 12.66
Divide 1.25 on both sides
V= 12.66/1.25 —> 10.13L
Your answer should be approximately 10.13L
Answer: -
Oxygen, a group 16 element with an electron configuration of 1s22s22p4, will form a __Negative___ ion in a chemical bond
Explanation: -
Oxygen has the electronic configuration of 1s2 2s2 2p4.
Number if valence electrons of oxygen = 2 + 4 = 6
Oxygen just needs 2 more electrons to have 8 electrons in it's valence shell and become stable as per Octet rule.
Thus oxygen will accept 2 electrons during formation of a chemical bond.
Due to this it will have negative charge and form a negative ion or anion in a chemical bond.
Answer:
1.08 g/mL
Explanation:
Density=Mass/Volume therefore you would do the mass which is 7.481 g divided by the volume which is 6.9 mL and get 1.08 g/mL since you combine the two labels!
Answer: It minimizes fossil fuels and is a pollution-free mode of transport. Bokes reduce the need to build, servie and dispose cars.
Hope this helps you out.