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iE xplanation:am osrry nisot p ake inligsh
As metal + acid will form hydrogen gas and salt , the chemical equation is :
Mg + 2HCl --> H2 + MgCl2
For this problem, we have to use the Planck's equation.
E = hv
where
E is the energy
h is Planck's constant equal to 6.626×10⁻³⁴ J·<span>s
v is the frequency in Hz or s</span>⁻¹<span>
Applying the equation, the answer would be:
E = (</span>6.626×10⁻³⁴ J·s)(5.49×10¹⁴ s⁻¹)
<em>E = 3.64×10⁻¹⁹ J</em>
