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Need help with how to write these 2 short chemical equations

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"Solid cupric sulfide heated strongly in oxygen gas"

"Silicone tetrahydride gas, silane, is burned in oxygen"

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The only other thing I need to know is ---

BH3 O2 ===>

Does B exist in the product? or is it completely gone?

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  1. 2 CuS + 3 O2 -> 2 CuO + 2 SO2

    SiH4 + 2 O2 -> 2 H2O + SiO2

    on both above arrow you put triangle

    4 BH3 + 3 O2 -> 6 H2O + 4 B

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