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Leokris [45]
3 years ago
15

PLEASE HELP 15 POINTS ONE QUESTION

Chemistry
1 answer:
KIM [24]3 years ago
3 0
Answer: 12 Protons, 12 electrons and 16 neutrons. The number of protons and electrons always stays the same, but the neutrons is the mass-protons. In this case, 28-12=16 neutrons.
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Consider this reaction 2Mg(s)+O2(g) ———> 2MgO(s) What volume (in milliners) of gas is required to react with 4.03 g Mg at STP
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calculation/

  • calculate the moles of Mg used

     moles=mass/molar mass

moles of Mg is therefore=4.03 g/  24.3 g/mol=0.1658  moles

  • by use of mole ratio of Mg:O2  from  the equation  which is 2:1

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