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The atomic mass is 14, which is the combined mass of protons and neutrons. The atomic number is the number of protons. SO if we have a total mass of 14 and we know 7 of that is protons, 14-7=7
the nitrogen has 7 neutrons
a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound
1st compound contains 88.8 g cu
for cu
m = 63 g /mol
atomic % = 88.8 /63 = 1.42
for o
m = 16 g /mol
atomic % = 11.2 /16 = 0.7
b. the emperical formula of 1st compound is
cu1.4o0.7
cu2o
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