The theoretical yield is 160 g H₂O.
<em>Moles of H₂</em> = 18 g H₂ × (1 mol H₂/2.016 g H₂) = 8.93 mol H₂
<em>Moles of H₂O</em> = 8.93 mol H₂O × (2 mol H₂O/2 mol H₂) = 8.93 mol H₂O
<em>Theoretical yield</em> of H₂O = 8.93 mol H₂O × (18.02 g H₂O/1 mol H₂) = 160 g H₂O
Depends on what compound we’re talking about here
Answer:
See explanation below
Explanation:
3. Each atom has unique electron energy level when compared to other, when electron relaxes from an excited energy level, it emits energy in the form of electromagnetic waves with energy equals to the difference between energy of ground and excited state. As electromagnetic wave wavelength obeys planck relation

And the energy of each photon in electromangetic wave of specific frequency is

Where h is planck's constant
We can see that the wavelength, which determines color and position of bright line in spectroscope corresponds directly to the energy of electromagnetic wave, and thus, the characteristic energy of atom.
4. From the answer above, you now know that electronic transition can emit electron with specific wavelength. In strontium, emission of colored light occurs by the relaxation of electrons in excited state such that the difference between excited energy level and ground level falls in the energy of visible light spectral range.
5. In Na, ground state configuration is 2-8-1. 2-7-1-1 indicates that one of electron in ground state got excited by external energy to excited state, and thus, indicates that Na atom is in excited state
Given: Molar mass of NaOH=40 g/mol
Volume of NaOH solution=500 mL
Molarity of solution=0.225 M
Molarity of solution is defined as number of moles of solute in 1 L of solution. Thus,

Thus, to calculate the mass of NaOH, first calculate its number of moles by rearranging the above equation and putting values of volume and number of moles.

Now, number of moles are related to mass as follows:

Here, M is molar mass
Rearranging and putting the values of number of moles and molar mass thus,

Therefore, mass of NaOH in 500 mL of 0.225 M NaOH solution is 4.5 g.