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How many litres of oxygen are needed to react completely with 25.0L of H2S at STP according to the following reaction: 2H2S + 3o2 --> 2so2 + 2H2O At STP temperature is 273 K pressure is 101.3 Kpa R is 8.314 so PV=nRT 101.3×25= n× 8.314× 273 n= 1.11 so usi...

Question: use the first principles of a derivative to find (dy÷dx) f(x)= -x^4 +4x^4 So we need to use the formula f(x+h)- f(x) ÷ h So far I have x^4 - h^4 -4h^3x -6h^2x^2 - 4h^3-x^4 + 4x^2 +8hx+ 4h^2÷ h is this correct and what do I do after