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ladessa [460]
3 years ago
7

12

Chemistry
1 answer:
VARVARA [1.3K]3 years ago
5 0

Answer:

B

Explanation:

the number of protons never changes even if the atomic mass changes

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The mineral enargite is 48.41% cu, 19.02% as, and 32.57% s by mass. what is the empirical formula of enargite?
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Empirical formula is the simplest ratio of whole numbers of components in a compound. 
Assuming for 100 g of the compound 
                                Cu                                 As                             S
mass                      48.41 g                          19.02 g                      32.57 g
number of moles    48.41 / 63.5 g/mol      19.02 / 75 g/mol        32.57 / 32 g/mol 
                                = 0.762 mol                = 0.2536 mol            = 1.018 mol 
divide by the least number of moles 
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Cu - 3
As - 1
S - 4
therefore empirical formula is Cu₃AsS₄
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3 years ago
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