Answer:
First and last sentence .♀️
Explanation:
An important thing to keep in mind about the Reading Comprehension section of the GRE as we use PowerPrep online to study is that it is just that—reading comprehension. In other words, as difficult as it may seem, and it can be pretty tricky, the test makers will always give us all the information we need in the passage to answer the question.
Answer:
Explanation:
Generally, the factors that affect rate of chemical reactions include
- pressure (affects non-solid reactants)
- surface area of solid reactants
- concentration of reactants
- presence/absence of catalysts
From the above, it shows that some of these factors do not need to be considered when discussing rate of reaction of gases of equal moles as we have in the question.
The factors that will determine the difference in the reaction rates of the gases in the two syringes will just be temperature of the syringes (if the temperature of the syringes are not the same) and the pressure applied on the gases in the syringes (if the pressure applied to the syringes are not the same). If catalyst is introduced to one and not to the other, that will be increase the rate of the reaction in the one the catalyst is introduced and hence the reaction rate varies.
An increase in temperature and/or pressure will lead to an increase in the rate of reaction.
the balanced equation for the combustion of ethane is as follows
2C₂H₆ + 7O₂ --> 4CO₂ + 6H₂O
molar ratio of C₂H₆ to H₂O is 2:6
this means that when 2 mol of C₂H₆ react 6 mol of H₂O are produced
for every 1 mol of C₂H₆ that reacts thrice the number of moles of H₂O are produced
therefore when 1.4 mol of C₂H₆ reacts - 3 x 1.4 = 4.2 mol of H₂O are produced
the answer is 4.2 mol
Answer:
explanation and image attached
Explanation:
Our aim is to draw a structure of XeO2F2 whith the least formal charges. We must remember that the compound has 34 valence electrons.
To obtain the least formal charges then Xe must have a total of twelve electrons on its valence shell instead of eight.
The other atoms around the central Xe atom are arranged as shown in the image attached.
Image Credit: UCLA