4
Numbers above zero are significant, as well as any zeros that appear in between two non-zero numbers.
Explanation:
thanks 4 d free points ...have a nice day
Density= 1.2092 because density = mass/volume
Answer:
3.) 51.7 L
Explanation:
To find the volume, you need to use the Ideal Gas Law:
PV = nRT
In the equation,
-----> P = pressure (kPa)
-----> V = volume (L)
-----> n = moles
-----> R = Ideal Gas constant (8.314 kPa*L/mol*K)
-----> T = temperature (K)
First, you need to convert the temperature from Celsius to Kelvin. Then, you can plug the given values into the equation and simplify to find "V".
P = 68.0 kPa R = 8.314 kPa*L/mol*K
V = ? L T = 27.00 °C + 273 = 300 K
n = 1.41 moles
PV = nRT <----- Ideal Gas Law
(68.0 kPa)V = (1.41 moles)(8.314 kPa*L/mol*K)(300 K) <----- Insert values
(68.0 kPa)V = 3516.822 <----- Multiply right side
V = 51.7 <----- Divide both sides by 68.0
Answer:
0.00120 moles of electrons had traveled through the wire.
Explanation:
Amount current passed in 132 seconds = 0.880 A
Charge passed in 132 seconds = Q
![Q=0.88 A\times 132 s=116. C](https://tex.z-dn.net/?f=Q%3D0.88%20A%5Ctimes%20132%20s%3D116.%20C)
Number of electrons = N
Magnitude of charge on an electron = q = ![1.602\times 10^{-19} C](https://tex.z-dn.net/?f=1.602%5Ctimes%2010%5E%7B-19%7D%20C)
![Q=N\times q](https://tex.z-dn.net/?f=Q%3DN%5Ctimes%20q)
![N=\frac{116. C}{1.602\times 10^{-19} C}=7.25\times 10^{20}](https://tex.z-dn.net/?f=N%3D%5Cfrac%7B116.%20C%7D%7B1.602%5Ctimes%2010%5E%7B-19%7D%20C%7D%3D7.25%5Ctimes%2010%5E%7B20%7D%20)
1 mole =
ions/ particles/ atoms
The moles of electron in
electrons:
![=\frac{7.25\times 10^{20}}{6.022\times 10^{23}}=0.00120](https://tex.z-dn.net/?f=%3D%5Cfrac%7B7.25%5Ctimes%2010%5E%7B20%7D%7D%7B6.022%5Ctimes%2010%5E%7B23%7D%7D%3D0.00120)
0.00120 moles of electrons had traveled through the wire.