Exam Guidelines Exam Instructions Question 4 of 20 : Select the best answer for the question: 4. After writing and balancing the equation, what's the next step in using bond energies to calculate the enthalpy of a reaction? O A. Sum the bond energies of the products. B. Write down the bond energies for the products and reactants. O C. Write the fructures of the products and reactants. O D. Subtract the bond energies of the products from the reactants.​

i dont really know

Explanation:

take ur test homie

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

it would be d. henry moseley

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