Expression for the Balmer series to find the wavelength of the spectral line is as follows:
1 / λ = R
Where, λ is wavelength, R is Rydberg constant, and n is integral value (4 here → Fourth level)
Substitute 1.097 x 10⁷ m⁻¹ for R and 4 for n in the above equation
1 / λ = (1.097 x 10⁷ m⁻¹)
= 0.20568 x 10⁷ m⁻¹
λ = 4.86 x 10⁻⁷ m
since 1 m = 10⁹ nm
λ = 486 nm
Answer:
True
Explanation:
Molecular mass of :
Molecular mass of Ca + molevular mass of C + molecular mass of O × 3
40g + 12g + 16 × 3g
= 40g + 60 = 100g
Thus its true
Temperature is a measure of the average kinetic energy of the particles in the sample. This is the statement that defines the temperature of a sample of matter.
The temperature of a system is defined simply as the average energy of microscopic motions of a single particle in the system per degree of freedom.
The microscopic motions in a solid matter is the principal vibrations of the constituent atoms about their sites. In an ideal monoatomic gas, the microscopic motions are the translational motions of the constituent gas particles. In multiatomic gases, aside from translational motions, vibrational and rotational motions are included in the microscopic motions.
Answer:
0.067M H3PO4
Explanation:
H3PO4 reacts with NaOH as follows:
H3PO4 + 3NaOH → 3H2O + Na3PO4
<em>Where 1 mole of H3PO4 reacts with 3 moles of NaOH</em>
To solve trhis question we need to find the moles of NaOH required. With the chemical equation we can find the moles of H3PO4 and its concentration as follows:
<em>Moles NaOH:</em>
50.0mL = 0.0500L * (0.20moles /L) = 0.0100 moles NaOH
<em>Moles H3PO4: </em>
0.0100 moles NaOH * (1mol H3PO4 / 3mol NaOH) = 0.00333 moles H3PO4
<em>Concentration:</em>
0.00333 moles H3PO4 / 0.0500L = 0.067M H3PO4