Can someone help me to answer this correctly, please, and explain it. Please answer these 3 short questions, I don't have more money to buy more questions. These 3 questions are different.

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According to the following reaction, how many grams of water will be formed upon the complete reaction of 28.5 grams of hydrogen peroxide (H2O2) ? hydrogen peroxide (H2O2)(aq) water (I)+ oxygen (g) grams water According to the following reaction, how many grams of copper are required for the complete reaction of 21.2 grams of silver nitrate? silver nitrate (aq)+copper(s)copper(II) nitrate (aq)+silver(s) Mass = Tetrasilane (Si4H10) is a liquid with a density of 0.792g/cm3. It reacts with oxygen to give silicon dioxide (SiO2) and water. Calculate the mass of water that would form if 20.1cm3 of tetrasilane reacted completely with excess oxygen. Mass = g