The mass of magnesium consumed amounts to 21.42g. Explanation: As per the balanced reaction, three moles of magnesium react with one mole of nitrogen, producing one mole of magnesium nitride. Given that the mass of nitrogen involved equals 8.33g, the moles of the reacted nitrogen equal a particular quantity. The required moles of magnesium, therefore, equals three times the moles of nitrogen utilized. Subsequently, the mass of magnesium needed is determined by multiplying the moles by its molar mass.
Answer:
189.2 KJ
Explanation:
Provided Data
light wavelength = 632.8 nm
Convert nm to meters
1 nm = 1 x 10⁻⁹
632.8 nm = 632.8 x 1 x 10⁻⁹ = 6.328 x 10⁻⁷m
What is the energy of 1 mole of photons?
Solution
Used Formula
E = hc/λ
where
E = energy per photon
h = Planck's Constant
Planck's Constant = 6.626 x 10⁻³⁴ Js
c = speed of light
speed of light = 3 × 10⁸ ms⁻¹
λ = wavelength of light
Insert values into the equation
E = hc/λ
E = 6.626 x 10⁻³⁴ Js ( 3 × 10⁸ ms⁻¹ / 6.328 x 10⁻⁷m)
E = 6.626 x 10⁻³⁴ Js (4.741 x 10¹⁴s⁻¹)
E = 3.141 x 10⁻¹⁹J
3.141 x 10⁻¹⁹J indicates the energy for a single photon
Next, we need to determine the energy for 1 mole of photons
It is known that
1 mole contains 6.022 x10²³ photons
Consequently,
Energy for one mole of photons = 3.141 x 10⁻¹⁹J x 6.022 x10²³
Energy for one mole of photons = 1.89 x 10⁵ J
Now convert J to KJ
1000 J = 1 KJ
1.89 x 10⁵ J = 1.89 x 10⁵ /1000 = 189.2 KJ
Thus,
the energy for one mole of photons is 189.2 KJ
To determine the specific heat capacity of the metal and assist in its identification, the heat absorbed by the calorimeter can be computed using: Energy = mass * specific heat capacity * temperature change Q = 250 * 1.035 * (11.08 - 10) Q = 279.45 cal/g. Next, we employ the same formula for the metal because the heat taken in by the calorimeter should equal the heat expelled by the metal. -279.45 = 50 * c * (11.08 - 45) [the minus sign indicates energy release] solving for c gives us 0.165. Therefore, the specific heat capacity of the metal amounts to 0.165 cal/g°C.
Answer:
C
Explanation
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