Question

HELP! CHEMISTRY QUESTIONS!

3. When two atoms of 2H (deuterium) are fused to form one atom of 4He (helium), the total energy evolved is 3.83 ?? 10-12 joules. What is the total change in mass (in kilograms) for this reaction?

4. The mass of a proton is 1.00728 atomic mass units (amu) and the mass of a neutron is 60Co nucleus whose nuclear mass is 1.00867 amu. What is the mass defect (in amu) of a 27 59.9338 amu? What is the mass defect in kilograms? What is the energy equivalent of this mass in kilojoules?

5. The equation shows one mole of ethanol fuel being burned in oxygen. Convert the energy released into its equivalent mass.

C2H5OH(l) + 3 O2(g) -> 2 CO2(g) + 3 H2O (l) ??H = -1418 kJ/mol

Answer 1

The total change in mass for the fusion of two deuterium atoms into helium can be calculated using Einstein's equation, E=mc^2, resulting in a very small mass change of 4.26 × 10^-29 kilograms for the large energy release of 3.83 × 10^-12 joules.

Step-by-step explanation:

When two atoms of 2H (deuterium) are fused to form one atom of 4He (helium), an energy of 3.83 × 10-12 joules is released. According to Einstein's equation, E=mc2, this energy can be used to find the change in mass, where E is energy, m is mass, and c is the speed of light. To find the mass change in kilograms, rearrange the equation to m=E/c2, and using the speed of light (c) as 3.00 × 108 m/s, the calculation is as follows:

m = 3.83 × 10-12 J / (3.00 × 108 m/s)2 = 4.26 × 10-29 kg

This result shows the small amount of mass that is converted to the large quantity of energy in nuclear fusion reactions, highlighting the incredible energy density of such processes.

Answer 2

E= m× C2
... than:
m=E/c 2
m=1,366•10^3/3•10 A 8 2
m=1,518•10^14 kg