most recent 30 from http://merspi.com.au 2010-07-30T10:53:34Z http://merspi.com.au/feeds/tag/molecular-formula http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://merspi.com.au/questions/1051/formula-of-hydrocarbon-by-explosion-with-oxygen James 2010-01-22T00:15:49Z 2010-02-05T08:25:21Z

<p>To 20cm³ of a gaseous hydrocarbon. 80cm³ of oxygen were added. After explosion and cooling to room temperature, the residual gases occupied 70cm³. After absorption by KOH, 30cm³ of oxygen remained. Determine the formula of the hydrocarbon.</p>

http://merspi.com.au/questions/877/determining-the-molecular-formula-of-the-hydrocarbon Thao 2010-01-11T11:09:52Z 2010-01-11T22:18:24Z

<p>During an analysis of a hydrocarbon, a 10.5 g of sample underwent complete combustion to produce 17.5 L of CO₂ at SLC. A separate experiment showed the molar mass of the gas to be 44.0 gmol^-1. Determine the molecular formula of the hydrocarbon.</p> <p>I tried to do it, but it's not working out. Please help. Cheers :)</p>

http://merspi.com.au/questions/716/empirical-and-molecular-formulae Impractical 2010-01-04T10:25:54Z 2010-01-06T08:38:09Z

<p>Firstly, does 120 g have 3 or 2 significant figures in chemistry?</p> <p><hr></p> <p>After working out a compounds empirical formula, when I found out the that the 'actual' thing is double in terms of molar mass, how do I know that it will go from say: CH₂O to C₂H₄O₂ instead of simply 2CH₂O which produces the same 'evidence' satisfaction.</p>