Answer:
5.97 mol
Explanation:
To find the number of moles when given the mass of a substance, we divide the mass of the sample by its molar mass.
so, we get,
nN203 = 454 g / 76.01 g /mol
= 5.97 mol
Answer:
It has 5 neutrons
Explanation:
The fact that it is a neutral atom tells us that the number of electrons and protons is the same:
- The problem tells us there are 4 electrons, thus there are 4 protons.
The average mass of an atom is the sum of the number of protons and the number of neutrons:
- Mass = # Protons + # Neutrons
With the above information in mind we can <u>calculate the number of neutrons</u>:
- 9 amu = 4 Protons + # Neutrons
Answer:
1.092 moles of Mg
Explanation:
Avogadro's number is a constant that define the number of particles (Such as atoms, molecules, electrons, ions) that you have in 1 mole. That means in 1 mole you have 6.022x10²³ of the particle in question.
If you have 6.578x10²³ atoms of Mg -and 1 mole of Mg contains 6.022x10²³ atoms of Mg-:
6.578x10²³ atoms of Mg × (1 mole Mg / 6.022x10²³ atoms of Mg) =
<h3>1.092 moles of Mg</h3>
Answer:
B
Explanation:
Because when a cold object is cold it start to get warm because Of the air.
and it start to warm and it gets warm.