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QveST [7]
2 years ago
7

Which of the following is most likely an indication of a chemical change?

Chemistry
2 answers:
givi [52]2 years ago
6 0

Answer:

B.) A loud sound when a starter's pistol is fired at a race.

faust18 [17]2 years ago
4 0
B. A loud sound when a starters pistol is fired at a race
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Explanation: in exothermic reaction heat is released out

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How many moles of Boron (B) are in 5.03 x 1024 B atoms?
goldfiish [28.3K]

Hey there!:

Number of moles =   ( number of atoms / 6.023*10²³ atoms )

given number of atoms = 5.03*10²⁴

Therefore:

Number of moles B = 5.03*10²⁴ / 6.023*10²³

Number of moles B = 8.35 moles

Hope that helps!


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