Question

A sample of CaCO3 and MgCO3
together weighs 20g. After thermal
decomposition, the mass of oxide
residue weighed 10.53g. Then the
fractional mass of MgCo, in the original sample was close to
(1) 0.3
(2) 0.4
(3) 0.5
(4) 0.6
​

Answer 1

Answer:

2 is correct

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Answer 2

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