Use the formula E=mc^2
energy given=<span>8.1 x 10^16 joules
</span>speed of <span>light = 3.00 × 10^8 m/s
</span>
plug in the values we'll get mass=<span>9.0 x 10-1 kg</span>
D = m / V
6.72 = m / 55.1
m = 6.72 x 55.1
m = 370.272 g
Answer:
0.26 moles........................
<span>Displaced volume :
</span>Final volume - <span>Initial volume
</span>
38.55 mL - 15.75 mL => 22.8 mL
Mass = 31.745 g
Therefore:
density = mass / volume
D = 31.745 / 22.8
D = 1.3923 g/mL