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How much of this rock in kg must be processed to obtain 55

Question:

1-A mixture of 56.0 g of S and 1.00×102 g of Cl₂ reacts completely to form S₂Cl₂ and SCl₂ . Find the mass of S₂Cl₂ formed.

2-Lead is found in Earth's crust as several different lead ores. Suppose a certain rock is composed of 38.0% PbS (galena), 25.0% PbCO₃ (cerussite), and 17.4% PbSO₄ (anglesite). The remainder of the rock is composed of substances containing no lead.

How much of this rock (in kg ) must be processed to obtain 5.5 metric tons of lead? (A metric ton is 1000 kg .)

Express your answer using two significant figures.

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Chemistry: How much of this rock in kg must be processed to obtain 55

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