Approximately 1.9 kilograms of this rock.
Relative atomic mass data from a modern periodic table:Pb: 207.2;S: 32.06.
To answer this question, start by finding the mass of Pb in each kilogram of this rock.
89% of the rock is . There will be 890 grams of in one kilogram of this rock.
Formula mass of :
How many moles of formula units in that 890 grams of ?
There's one mole of in each mole of . There are thus of in one kilogram of this rock.
What will be the mass of that of ?
In other words, the in 1 kilogram of this rock contains of lead .
How many kilograms of the rock will contain enough to provide 1.5 kilogram of ?
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