Answer:
b. 23.3g
Explanation:
Based on the reaction:
CH₄ + 2O₂ → CO₂ + 2H₂O
To find the mass of CO2 produced we must find, as first, the limiting reactant. With limiting reactant we can find the moles and the mass of CO2 as follows:
<em>Limiting reactant:</em>
For a complete reaction of 0.53 moles of CH4 are necessaries:
0.53 moles CH4 * (2mol O2 / 1mol CH4) = 1.06 moles O2.
As there are 1.5 moles, CH4 is limiting reactant.
<em>Moles CO2:</em>
1 mole of CH4 produce 1 mole of CO2. That means the moles of CO2 formed are 0.53 moles.
<em>Mass CO2 (Molar mass: 44.01g/mol)</em>
0.53 moles CO2 * (44.01g / mol) =
b. 23.3g
Answer:
Here's what I get.
Explanation:
The name tells me the compound is a lactone (a cyclic ester).
1. IR spectrum
1770 cm⁻¹
Esters and unstrained lactones normally absorb at 1740 cm⁻¹.
This peak is shifted to a higher frequency by ring strain.
A five-membered lactone absorbs at 1765 cm⁻¹, and a four-membered lactone at 1840 cm⁻¹.
The compound is probably a five-membered lactone.
2. NMR spectrum
2.28 m (2H)
2.48 t (2H)
4.35 t (2H)
This indicates three CH₂ groups arranged as X-CH₂-CH₂-CH₂-Y.
The X-CH₂- and -CH₂-Y signals would each be triplets, being split by the central -CH₂- group.
The central -CH₂- signal would be a multiplet, split by the non-equivalent hydrogens on either side.
The peak at 4.35 ppm indicates that the group is adjacent to an oxygen atom ( -CH₂- = 1.3; -CH₂-O- = 3.3 - 4.5).
The peak at 2.42 ppm indicates that the group is adjacent to a carbonyl group (-CH₂-C=O = 1.8 - 2.5.
The only way to fit these pieces together is if γ-butyrolactone has the structure shown below.
Confirmation:
(a) The IR spectrum shows a carbonyl peak at 1770 cm⁻¹.
(b) The NMR spectrum matches that given in the problem.
The correct answer is a solute and a solvent
A solution is any homogenous mixture of two or more substances. It does not necessarily have to be liquid or gaseous.
Explanation:
from the graph study about oxygen content of Earth's atmosphere, we can understand that
1)
4 billions year ago = None, 3 billions year ago = Cyanobacteria and Archaea , 2 and 1 billions year ago = Bacteria and Green algae , 500 Ma = invertebrate fossils started to existence. Early land plants came in to existence around 398 MA that is Devonian. Dinosaurs are came in to existence during Triassic and Jurassic that is around 251 Ma. Man and animals are recent organism came under Holocene that is 11000 years ago.
2)
The first cells on the earth are anaerobic microorganisms, as the CO2 level is too high they survive by using CO2.
3)
Starting around 2.7 billion years ago, photosynthesis by Cyanobacteria and later plants , pumped “OXYGEN” in to the atmosphere. This caused the decline of anaerobic bacteria and allows the diversification of animals as seen in “CAMBRIAN” around 500 millions year ago.
Early vascular plants “CAPTURED” CO2 starting before the Carboniferous period that began around 350 millions year.Leading to lower temperatures and allowing and allowing the seed plants to outcompetes seedless plants.
Modern human activities has raised both “CO2 and METHANE” level in the atmosphere to over leading to higher temperature and extinction of other species.
