Common soda-lime-silica glass is made by melting together Na2CO3, CaCO3, and SiO2.  The carbonates break down, liberating CO2 gas bubbles that help to mix the molten glass. For 1,000 kg of container glass (15 wt% Na2O, 10 wt% CaO, 75 wt % SiO2), calculate the raw material batch formula.  What is the weight percent of SiO2?

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