The answer is (b) Law of conservation of mass.How much hydrogen should be present in a different, 50.0 g same of methane? (Law of Definite Proportions): A sample of methane contains only carbon and hydrogen, with 3.00 grams (g) of carbon for every 1.00 g of hydrogen.(a) What mass of oxygen is needed in this reaction? (b) What mass of oxygen is needed to burn 8.00 lb of wood? 1 lb = 453.59237 g. The products of this reaction weigh 74.4 g. (Law of Conservation of Mass): 36.0 grams (g) of wood are burned in oxygen.Show that these results are consistent with the law of constant composition.

6.92 g of sodium chloride was produced in the second experiment. In the second experiment, 4.20 g of chlorine reacted with 20.00 g of sodium, using up all the chlorine. 11.08 g of sodium chloride was produced in the first experiment. In the first experiment, 4.36 grams (g) sodium are reacted with 32.24 g of chlorine, using up all the sodium. (Law of Definite Proportions) Two experiments using sodium and chlorine are performed.The reaction produces 22.00 g of carbon dioxide and an unmeasured mass of water. (Law of Conservation of Mass) 8.00 grams (g) of methane are burned in 32.00 g of oxygen.Which law is this an example of? (a) Law of definite proportions (b) Law of conservation of mass or (c) Law of multiple proportions. (Basic concept check) When 32.0 grams (g) of methane are burned in 128.0 g of oxygen, 88.0 g of carbon dioxide and 72.0 g of water are produced.

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