Answer to Question #161378 in General Chemistry for Tyler Murphy

Question #161378
  1. A student performs the reaction below, which we’ve discussed many times throughout the course. Assume that the student produces 6.101 g of product after performing the reaction on a day where the air pressure was 100.2 kPa and the thermostat was set to 20.0°C. What volume of oxygen gas, in mL, did the reaction use from the classroom’s air? {/12}

2 Mg(s)  +  O2(g) → 2 MgO(s)

 




1
Expert's answer
2021-02-09T03:37:57-0500

Product MgO = 6.101 g

6.101 g ×"\\frac{1moleMgO}{30.44gMgO}" = 0.2004 moles MgO

n = 0.2004 moles

P = 100.2kPa

T = 20⁰C = 293K

PV = nRT

100.2×V = 0.2004×0.0821×293

V = 0.04811L

V = 48.11 ml


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