Well all reactions need energy to start it. The light is the energy that the reaction requires to start it. Sunlight also has no mass in the first place so laws of conservation of mass don't apply to it.
The balanced equation for the above reaction is;
CH₄ + 2O₂ ---> CO₂ + 2H₂O
Stoichiometry of CH₄ to O₂ is 1:2
The number of methane moles present - 1.44 g/ 16 g/mol = 0.090 mol
Number of oxygen moles present - 9.5 g/ 32 g/mol = 0.30 mol
If methane is the limiting reagent,
0.090 moles of methane react with 0.090x 2 = 0.180 mol
only 0.180 mol of O₂ is required but 0.30 mol of O₂ has been provided therefore O₂ is in excess and CH₄ is the limiting reactant.
Number of moles of water that can be produced - 0.180 mol
Therefore mass of water produced - 0.180 x 18 g/mol = 3.24 g
Therefore mass of 3.24 g of water can be produced
The base peak in the mass spectrum of 3-methylpentane has the most plausible value at m/z=57. Hydrocarbons often undergo mass spectroscopic fragmentation at a branch.
<h3>What does the mass spectrometry Mz value mean?</h3>
The horizontal axis in a mass spectrum is stated in units of mass divided by charge number, or m/z. With GCMS, z is usually always 1, hence the mass is frequently determined by the m/z value.
<h3>What is the M Z of the base peak?</h3>
The base peak of the spectrum is defined as the peak with the arbitrary intensity value of 100. The molecular ion, which has a peak at m/z=72, is what determines the molecule's molecular mass.
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Atomic radius increases down a group
