1-Paracresol is used as a disinfectant and in
the manufacture of herbicides and
artificial food flours. A 0,401 g sample of
this carbon-hydrogen-oxygen compound
yields 1,144 g CO2 and 0,2671 g H2O in
combustion analyses. What is the
empirical formula of paracresol? (C=12 ;
H=1 ; O=16)
2. A sample of Octane(C8H18) carrying
2,968x1025 C atoms and having a density
of 0,702 g/cm3 was combusted with 360 g of
O2 and as a result of this combustion CO2
, CO, and H2O were produced. The
amount of H2O(l) produced during the
reaction was weighed 162 g. If oxygen
gas was consumed completely during the
reaction,
a) Determine the rate of combustion
efficiency
b) Calculate the rate of CO2
efficiency(nactual/ntheoretical x100)(To
calculate ntheoretical, assume that no CO
was produced)
c) Calculate the mass of O2 required to
produce CO when the whole sample is
burnt
d) Calculate the volume of the sample in L
(C=12 ; H=1 ; O=16)
2. Hexachlorophene, used in making
germicidal soaps, has the following percent
composition by mass: 38,77% C ; 1,49%
H; 52,28% Cl ; 7,86% O. What is the
empirical formula of hexachlorophene?
3- What mass of BHA(C11H16O2) should be
burned to produce 0,5 g CO2 in
combustion analysis? (C=12 ; H=1 ;
O=16)
4- Name the compounds
CaSO4 ∙ 2 H2O
CaSO4 ∙ ½ H2O
Mg SO4 ∙ 7 H2O
Na2CO3 ∙ 10 H2O
Na2B4O7 ∙10 H2O