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Hydrogen sulfide is composed of two elements: hydrogen and sulfur

Hydrogen sulfide is composed of two elements: hydrogen and sulfur. In an experiment, 6.500 g of hydrogen sulfide is fully decomposed into its elements.
A) if 0.384g of hydrogen is obtained in this experiment, how many grams of sulfur must be obtained
B) What fundamental law does this experiment demonstrate?
C) How is this law explained by Dalton's atomic theory?

Determine the empirical and molecular formulas of each of the following substances:
a) Ibuprofen has 75.69% C, 8.80%H and 15.51%O by mass and has a molar mass about 206g/mol
b) Cadaverine has 58.55%C, 13.81%H and 27.40%N by mass, its molar mass is 102.2g/mol
c) Epi has 59.0%C, 7.1%H, 26.2%0 and 7.7%N by mass; its MW is about 180 amu.

When a mixture of 10.0g of acetylene(C2H2) and 10g of oxygen (O2) is ignited, the resultant combustion reaction produces CO2 and H20.
A) write a balanced chemical equation for this reaction
B)Which is the limiting reactant?
C)How many grams of C2h2, o2, co2 and H2o are present after the reaction is complete?