Barium oxide was synthesized form the reaction of barium and oxygen in a crucible according to the balanced chemical reaction below. Water was used to convert any side products to Bao, and then the crucible was heated to drive off any remaining moisture. The mass data from the
experiment is shown below.
2 Ba(s) + O2(g) → 2 Bao(s)
MASS DATA
Mass of Crucible
42.424 g
Mass of Crucible + Lid
47.6894 g
Mass of Crucible + Lid + Ba
49.7842 g
Mass of Crucible + Lid + Bao after 1st heating
50.7265 g
Mass of Crucible + Lid + Bao after 2nd heating
49.6894 g
Mass of Crucible + Lid + Bao after 3rd heating
49.6891 g
What is the percent yield of BaO in the reaction?
42.75%
100.3%
O 85.49%
99.72%

explanation:

the largest database of organic compounds lists about 10 million substances, which include compounds originating from living organisms and those synthesized by chemists. the number of potential organic compounds has been estimated at 1060—an astronomically high number. the existence of so many organic molecules is a consequence of the ability of carbon atoms to form up to four strong bonds to other carbon atoms, resulting in chains and rings of many different sizes, shapes, and complexities. the simplest organic compounds contain only the elements carbon and hydrogen, and are called hydrocarbons. even though they are composed of only two types of atoms, there is a wide variety of hydrocarbons because they may consist of varying lengths of chains, branched chains, and rings of carbon atoms, or combinations of these structures. in addition, hydrocarbons may differ in the types of carbon-carbon bonds present in their molecules. many hydrocarbons are found in plants, animals, and their fossils; other hydrocarbons have been prepared in the laboratory. we use hydrocarbons every day, mainly as fuels, such as natural gas, acetylene, propane, butane, and the principal components of gasoline, diesel fuel, and heating oil. the familiar plastics polyethylene, polypropylene, and polystyrene are also hydrocarbons. we can distinguish several types of hydrocarbons by differences in the bonding between carbon atoms. this leads to differences in geometries and in the hybridization of the carbon orbitals.

b) mutualism

hope this : )

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml