Number of photons can be calculated by dividing the needed energy by the energy per photon.
The minimum energy needed is given as 2 x 10^-17 joules
Energy per photon = hc / lambda where h is planck's constant, c is the speed of light and lambda is the wavelength
Energy per photon = (<span>6.626 x 10^-34 x 3 x 10^8) / (475 x 10^-9)
= 4.18 x 10^-19 J
number of photons = (2 x 10^-17) / (4.18 x 10^-19)
= 47.79 photons which is approximately 48 photons</span>
Answer:
of heat energy will be released
Explanation:
Balanced reaction-
According to balanced equation, moles of produces 1 mol of to release 46.17 kJ of heat.
Molar mass of = 2.016 g/mol
Number of moles = (mass)/(molar mass)
So, 28 kg of = 28000 g of
= moles of
= moles of
So. moles of react to release heat or of heat
I had this question before if your answer choice D) says it had more mass than the rest of the atom. then that will be it :)
Explanation:
Given
The enthalpy of formation of RbF (s) is –557.7kJ/mol
The standard enthalpy of formation of RbF (aq, 1 m) is –583.8 kJ/mol
The enthalpy of solution of RbF = Enthalpy of RbF (aq) - Enthalpy of formation of RbF (s)
= -583.8 - (-557.7) kJ/mol
= -26.1 kJ/mol
The enthalpy is negative which means that the temperature will rise when RbF is dissolved.
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