(1)Hello, this is my question. how many moles of oxygen gas (O2) are needed to produce 36.04 grams of water (H2O) when reacting with excess ethane in the equation 2C2H6 + 7O2 5CO2 + 6H2O?
A. 19.0 moles of oxygen (O2)
B. 14.0 moles of oxygen (O2)
C. 2.3 moles of oxygen (O2)
D. 1.2 moles of oxygen (O2)

How many moles of water would be produced from the reaction of 3.25 moles of hydrochloric acid racting with excess calcium hydroxide?
help me please!

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