-Elements in group 2 (alkaline earth metals) have a 2 valence electrons (two electrons in the outermost energy shell). Which means that for these elements to achieve an octet configuration, they will have to loose two electrons. Therefore; element X has a valency electrons, it reacts chlorine to form a compound (XCl2), since chlorine has a valency of 1.
<span>8.21 L of C3H8(g)
Lets take c as the molar volume at that temperature. c L <><> 5c L C3H8 (g) + 5O2 (g) --> 3CO2 + 4H2O + Q 8.21 L <><> x L x = (8.21 * 5c)/c = 8.21 * 5 = 41.05 L O2 consumed for a 100% yield.</span>
