An element’s atomic number is equal to the number of protons in that element’s nucleus. The mass number is the total number of an atom’s protons and neutrons. Protons have a positive charge; electrons have a negative charge; and neutrons are electrically neutral.
Putting it all together, given that the atomic number of lead is 82, the number of protons a lead atom contains is 82. The number of neutrons would be the difference between 207 and 82, or 125 neutrons. Finally, since you have a neutral atom, there must be an equal number of electrons as the number of protons—that is, 82 electrons.
Thus, you’ve got 82 protons, 125 neutrons, and 82 electrons.
Answer:
The minimum mass of ethane that could be left over by the chemical reaction is zero.
Explanation:
![2C_2H_6+7O_2\rightarrow 4CO_2+6H_2O](https://tex.z-dn.net/?f=2C_2H_6%2B7O_2%5Crightarrow%204CO_2%2B6H_2O)
Moles of ethane = ![\frac{23.0 g}{30 g/mol}=0.7666 mol](https://tex.z-dn.net/?f=%5Cfrac%7B23.0%20g%7D%7B30%20g%2Fmol%7D%3D0.7666%20mol)
Moles of oxygen gas :
![\frac{147.0 g}{32 g/mol}=4.59375 mol](https://tex.z-dn.net/?f=%5Cfrac%7B147.0%20g%7D%7B32%20g%2Fmol%7D%3D4.59375%20mol)
Since, 2 moles of ethane gas react with 7 moles of oxygen gas.
Then 0.7666 mol of ethane gas will react wit:
![\frac{7}{2}\times 0.7666 mol=2.6831 mol](https://tex.z-dn.net/?f=%5Cfrac%7B7%7D%7B2%7D%5Ctimes%200.7666%20mol%3D2.6831%20mol)
This means that ethane gas is in limited amount.hence ethane is a limiting reagent. Where as oxygen in present in excessive amount.
All the moles ethane gas will go under combustion reaction leaving zero moles behind.
B. They are invert. I just took that question.
Answer:
Please Mark as Brainliest!!!!!!!!!!
Explanation:
Increasing pressure is causing a smaller change in gas volume. The closeness of particles of gas and their low speeds allow intermolecular forces to become important at certain pressured and temperature
Yes it is 100% true about mineral that <span>A mineral is a naturally occurring solid with a regular, repeating structure.</span>