Because Mg stands before H on the metal reactivity scale
Answer:
Number of atoms =1.806×10²⁴
Explanation:
You have the number of moles of Carbon tetrachloride which is n=3
And you are looking for number of atoms that are in the sample, which are represented by the letter "N"
The formula that has both number of moles(n) and number of atoms(N) is written as n=N/Na
Na is called the Avogadros number and it is equal to 6.08×10²³, it never changes(it is a constant)
So you will substitute the number of moles and the avogadros number to you formula, and the only unknown will be the number of atoms which you are looking for
- n=N/Na
- 3=N(6.02×10²³)
- N=1.806×10²⁴ atoms of CCl
NB: N does not represent the number of atoms only. It may also represent the number of particles or molecules...
Answer:
83.7% oxygen, 16.3% hydrogen
Explanation:
Mass of compound = 16.75 g
Mass of Oxygen = 14.02 g
Mass of Hydrogen = 2.73 g
Percentage composition = Mass of element / Mass of compound 100%
Percentage composition of Oxygen = 14.02 g / 16.75 g * 100%
Percentage composition of Oxygen = 0.837 * 100 = 83.7%
Percentage composition of Hydrogen = 2.73 g / 16.75 g * 100%
Percentage composition of Hydrogen = 0.163 * 100 = 16.3%
The correct option is;
83.7% oxygen, 16.3% hydrogen
Answer:
Steps of the technological design process include: identify a problem, research the problem, generate possible solutions, select the best solution, create a model, test the model, refine and retest the model as needed, and communicate the final solution.
Explanation:
hope it helps, please mark brainliest
Answer:
E = 9.2x10^-22 kJ/atom
Explanation:
Ok to do this, we only need to do simple conversions, and then, we will get the final answer for this.
Now, we know the energy required to remove one mole of electrons which in this case is 554 kJ. This can be interpreted as 554 kJ/mol, which means that every mol of the solid metal consumes 554 kJ of energy to be removed.
We also know by principle definition that in 1 mole of electron we have 6.02x10^23 atoms.
This works with almost every atom of the periodic table.
So, if 1 mole contains 6.02x10^23 atoms, we can know by rule of three how much energy is required to remove the mole from an atom:
1 mole/6.02x10^23 mol/atom
and if we have the energy of 554 kJ/mole, let's cancel both moles, by doing a division, and we will have the energy required per atom:
E = 554 kJ/mole / 6.02x10^23 mole/atom
E = 9.2x10^-22 kJ/atom
This is the energy required to remove an atom from the metal
