For the complete combustion of 5.6dm3 of a gaseuos hydrocarbon cxhy. 28.0dm3 of oxygen gas were used, 16.8dm3 of co2 gas and 18.0gof liquid water were produced all gases measurement were made at stp. determine the chemical formula of the hydrocarbon

Answer is: the chemical formula of the hydrocarbon is C₃H₈.
Chemical reaction: CxHy + O₂ → xCO₂ + y/2H₂O.
V(CxHy) = 5,6 dm³.
V(O₂) = 28 dm³.
V(CO₂) = 16,8 dm³.
m(H₂O) = 18 g.
Vm = 22,4 dm³/mol; molar volume.
n(CxHy) = V(CxHy) ÷ Vm.
n(CxHy) = 5,6 dm³ ÷ 22,4 dm³/mol = 0,25 mol.
n(O₂) = 28 dm³ ÷ 22,4 dm³/mol = 1,25 mol.
n(CO₂) = 16,8 dm³ ÷ 22,4 dm = 0,75 mol.
n(H₂O) = 18 g ÷ 18 g/mol = 1 mol.
n(CxHy) : n(O₂) : n(CO₂) : n(H₂O) = 0,25 mol : 1,25 mol : 0,75 mol : 1 mol. 
n(CxHy) : n(O₂) : n(CO₂) : n(H₂O) = 1 : 5 : 3 : 4.
Reaction is than: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

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The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .