Question

Particle Mass (g/mol) 01e 0.00054858 11H 1.00782 42He 4.00260 Part A The sun produces energy via fusion. One of the fusion reactions that occurs in the sun is 411H→42He+201e How much energy in joules is released by the fusion of 2.88 g of hydrogen-1? Express your answer to three significant figures and include the appropriate units.

Answer #1

For the given fusion reaction

mass defect (m) = mass of products - mass of reactants

= (4 x 1.00728) - (4.00260 + 2 x 0.00054858)

= 0.025423 amu

c = 3 c 10^8 m/s

Energy = mc^2 = (0.025423 amu x 1.6603 x 10^-27)(3 x 10^8)^2 = 3.80 x 10^-12 J

moles of H-1 = 2.88 g/1.00728 g = 2.86 mol

Energy released by 2.88 g of H-1 = 2.86 mol x 3.80 x 10^-12 J = 1.087 x 10^-11 J

A series of reactions in the Sun leads to the fusion of three
helium nuclei (42He) to form one carbon nucleus (126C) .
Part A
Determine the net energy released by the reactions.
Express your answer using three significant figures and include
the appropriate units.
Q =
SubmitRequest Answer
Part B
What fraction of the total mass of the three helium nuclei is
converted to energy?
Express your answer using three significant figures.

Part A
Part complete
Choose the missing nucleus in the following reaction:
23292U??+42He+energy.
22890Th
22888Ra
22690Th
22688Ra
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Correct
Part B
Calculate how much energy is released.
Express your answer using three significant figures and include
the appropriate units.
Q =
7.547.54 MeVMeV

Problem 15.52
For the equilibrium
Br2(g)+Cl2(g)⇌2BrCl(g)
at 400 K, Kc = 7.0.
Part A
If 0.25 mol of Br2 and 0.55 mol of Cl2 are introduced into a
3.0-L container at 400 K, what will be the equilibrium
concentration of Br2?
Express your answer to two significant figures and include the
appropriate units.
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Part B
If 0.25 mol of Br2 and 0.55 mol of Cl2 are introduced into a
3.0-L container at 400 K, what will be...

2.4 mol of monatomic gas A initially has 4700 J of thermal
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initially has 8500 J of thermal energy.
Part A
Which gas has the higher initial temperature?
Gas A.
Gas B.
SubmitMy AnswersGive Up
Correct
Part B
What is the final thermal energy of the gas A?
Express your answer to two significant figures and include the
appropriate units.
Ef =
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What is the final thermal...

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The decomposition of NI3 to form N2 and I2 releases −290.0 kJ of
energy. The reaction can be represented as
2NI3(s)→N2(g)+3I2(g), ΔHrxn=−290.0 kJ
Find the change in enthaply when 15.0 g of NI3 decomposes.
Express your answer to three significant figures and include the
appropriate units.
Part B:
4NH3(g)+5O2(g)→4NO(g)+6H2O(g)
Calculate the standard heat of reaction, or ΔH∘rxn, for
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enthalpy of the formation of elements in their pure...

Part A
Mass, in grams, of 0.145 mol sucrose (C12H22O11 ).
Express your answer using three significant figures
Part B
Moles of Zn(NO3)2 in 141.50 g of this substance.
Express your answer using four significant figures.
Part C
Number of molecules in 7×10−6 mol CH3CH2OH .
Express your answer using four significant figures.
Part D
Number of N atoms in 0.650 mol NH3 .
Express your answer using three significant figures.

Part A
How much gravitational potential energy must a 3200-kg satellite
acquire in order to attain a geosynchronous orbit?
Express your answer to three significant figures and include
appropriate units.
Answer : (Value) (Units)
Part B
How much kinetic energy must it gain? Note that because of the
rotation of the Earth on its axis, the satellite had a velocity of
469 m/s relative to the center of the Earth just before
launch.
Express your answer to three significant figures...

1.33 g H2 is allowed to react with 9.73 g N2, producing 1.40 g
NH3.
Part A
What is the theoretical yield in grams for this reaction under
the given conditions?
Express your answer to three significant figures and include the
appropriate units.
Part B
What is the percent yield for this reaction under the given
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Express your answer to three significant figures and include the
appropriate units.

1. The mass of an average blueberry is 0.71 g and the mass of an
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