Answer:
<u><em>95 people can breath with five such trees supplying oxygen.</em></u>
Explanation:
Given data:
a man take in oxygen in a day : 22 (1 = 1000L)
Tree length: 33 m
Tree diameter : 0.55 m
tree produce oxygen in a year : 84,000 L
Tree oxygen in the air : 20%
1 = 1000 L
To find:
number of people can breath with 5 such trees: ?
Calculation:
Calculate the oxygen produced by 5 trees:
= 5 x 84,000
= 420.000 L
= 420
Calculate the air
= 420 x 100% / 20%
= 2100 m^3
Calculate the number of people:
= 2100 m^3 / 22 m^3
= 95.5
= 95 people
Answer: B - Cr(NO3)2
Explanation: The +2 on Chromium and the -1 on NO3 indicates the charge. And in order to balance out the charge, you will sometimes need to add more of a substance.
In this case, Cr has a +2 charge and NO3 has a -1 charge. To balance, the total charge needs to equal 0. So, you add another NO3 to make two -1 charges, which will cancel out the +2 charge on Cr.
a. P=0.971 atm=737.6 mmHg
b. n=2.88 x 10⁻³
<h3>Further explanation
</h3>
Dalton's law of partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
A. vapor pressure of water at 22.5 = 20.4 mmHg
Pt=P H₂ + P H₂O
758 = P H₂ + 20.4
P H₂=737.6 mmHg=0.971 atm
B.Ideal gas Law = PV=nRT
P = 0.971 atm
V = 72 ml = 0.072 L
R = 0.082 L/atm mol
T = 22.5 + 273.15 =295.65
Answer:
0.20moles
Explanation:
1 mole Na contains 23 g Na
23 g Na =1 mole of Na
1 g Na= 1/23 moles of Na
4.6 g Na= 1/23×4.6= 4.6/23=0.2 moles
Therefore 0.2 moles are present in 4.6 g of Na
It becomes gas because when the comet nears the sun, the sun freezes the comet causing it to become gas.