1.- An exothermic reaction causes the system to: a) warm up b) becomeacidic c) e

Question

1.- An exothermic reaction causes the system to: a) warm up    b) becomeacidic    c) expand    d) cooldown   e) give H2O 2.- Given 2 Na2O2(s) +2CO2(g) -----> 2Na2CO3(s) +O2(g) What mass (in grams) of Na2O2 isnecessary to consume 1.00 L CO2 at STP(standardtemperature and pressure) 1.- An exothermic reaction causes the system to: a) warm up    b) becomeacidic    c) expand    d) cooldown   e) give H2O 2.- Given 2 Na2O2(s) +2CO2(g) -----> 2Na2CO3(s) +O2(g) What mass (in grams) of Na2O2 isnecessary to consume 1.00 L CO2 at STP(standardtemperature and pressure)

Explanation / Answer

a) warm up (heat is given off in exothermic reactions) EDIT for 1. Try c). Many experiments are conducted at constanttemperature, so it can't just warm up, because that would increasethe energy by increasing the temperature. So work must be done bythe system, consuming the excess energy. b) PV = nRT n = (PV)/(RT) = (1 atm *1L)/(0.0821 L*atm/mol/K *273K) =0.044616 moles CO2 0.046616 moles CO2 *(2mol Na2O2/2 mol CO2) *(77.978 g/mol) = 3.48grams of Na2O2

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