Madagascar is one of the most important gem-producing countries. three tonnes of Madagascar rock were analyzed and found to contain the following minerals: 10.8% hydroxyapatite, 20.4% leucite, 15.3% hedenbergite, and 53.5% labradorite. The number of sodium atoms contained in the rock was 5.51x10^6 atoms. Find: kg-mol hydroxyapatite number of Fe atoms % mass composition of labradorite number of Al2O3 molecules

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