Standard equation would be N2(g)+3H2(g)==>2NH3(g), so through stoichiometry, (4 mol N2)(2mol NH3/1 mol N2), assuming excess H2, would yield 8 moles of NH3.
Answer:
Sry i am unable to see the attached picture but i hope this helps
Explanation:
There are a couple of ways to prepare a buffer solution of a specific pH. In the first method, prepare a solution with an acid and its conjugate base by dissolving the acid form of the buffer in about 60% of the volume of water required to obtain the final solution volume
Answer:
The heat of combustion per moles of caffeine is 4220 kJ/mol
Explanation:
Step 1: Data given
⇒ When benzoic acid sample of 0.245 grams is burned the temperature rise is 1.643 °C
⇒ When 0.260 gram of caffeine is burned, the temperature rise is 1.436 °C
⇒ Heat of combustion of benzoic acid = 26.38 kJ/g
<u>Step 2:</u> Calculate the heat released: for combustion of benzoic acid
0.245 g benzoic acid * 26.38 kJ/g = 6.4631 kJ
<u>Step 3</u>: Calculate the heat capacity of the calorimeter:
c = Q/ΔT
Q = 6.4631 kJ / 1.643°C = 3.934 kJ/ °C
<u>Step 4:</u> Calculate moles of a 0.260 g sample of caffeine:
Moles caffeine = Mass caffeine / Molar mass caffeine
0.260 grams/ 194.19 g/mol = 0.0013389 moles
Step 5: Calculate heat released: for combustion of caffeine
Q = c * ΔT
Q = 3.934 kJ/°C * 1.436 °C = 5.65 kJ
Step 6: Calculate the heat of combustion per mole of caffeine
5.65 kJ / 0.0013389 moles = 4219.9 kJ/mol ≈ 4220 kJ/mol
The heat of combustion per moles of caffeine is 4220 kJ/mol
Answer:
Below are the statements which are true about the structure of the periodic table:
B: The inner transition elements are placed at the bottom of the periodic table for easy viewing.
D: The distribution of electrons in energy levels is responsible for the shape of the periodic table.
Explanation:
Point A:
As we know that in a periodic table there are 7 period s and 18 groups. So, the number of periods is evidently lesser than the number of groups. But the shape of periodic table is regular and rectangular so point A is false.
Point B:
The inner transition elements or -f block elements are put at the bottom for easy viewing. These are the elements that have the valence electrons only in the f-orbital's. Therefore, they are placed separately at the bottom side of the table so that they can be easily viewed or studied from there. So, point B is true.
Point C:
If we talk about option C, then it is very clear and true that considering a rectangular shape of the periodic table, the groups are vertically arranged and periods are horizontally arranged, therefore it is false.
Point D:
Atoms of all elements have definite electronic distribution in different energy levels like s, p d or f. This is a very prominent feature of periodic tale that elements are divided in specific blocks, s, p, d and f based on their electronic configurations. Therefore, it is true.
Point E:
We also know that no. of metals in a periodic table are more than the no. of non metals like almost 91 out of 118 elements are metals in periodic table. Therefore, the point E "Nonmetals take up more than half the area of the periodic table." is false.
Hope it helps!
