
1eV --------- is ----------- 1.6*10⁻¹⁹J
1.931eV ---- is ----------- x
x = [1.931eV*1.6*10⁻¹⁹J]/1eV ≈ 3,1*10⁻¹⁹J
<u>ANSWER E</u>
Density = mass / volume so mass = density x volume. Therefore mass = 2.70 x 348 = 939.6g
There are actually three: One oxygen atom and two hydrogen atoms.