Answer:
40 mmHg
Explanation:
Dalton's Law of Partial Pressures, states that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of the individual gases in the mixture. Hence if I have gases A,B and C and I choose to designate the pressure of gas A as PA, the pressure of gas B as PB , the pressure of gas C as PC and the total pressure of all the gases together as PT. Then from Dalton's law; PT= PA + PB + PC
From the question; we designate the pressure of hydrogen as PA, pressure of nitrogen as PB and pressure of oxygen as PC.
PA= 70 mmHg
PB= the unknown
PC= 650 mmHg
If the total pressure of the gas mixture (PT) = 760 mmHg
Then;
760= 70 + PB + 650
PB= 760- (70+650)
PB= 760 - 720
PB= 40 mmHg
Therefore, the partial pressure of nitrogen is 40 mmHg
Answer:
Oxygen
Explanation:
If two balloons are filled with hydrogen gas and helium gas respectively, then we want to identify what gas is in each balloon, we have to do so by exposing the both balloons to flame in an oxygen atmosphere.
Hydrogen combines with oxygen in the presence of a flame with quite a loud sound and the flame is sustained but when a flame is brought near helium gas in a balloon, the gas will only make a little sound when exposed to the flame and extinguish the flame.
The reason for the explosion of the gas in the hydrogen balloon is that combustion of hydrogen gas is exothermic. The heating up of surrounding air molecules leads to a sudden explosion.
However, the helium balloon makes a little sound when the balloon is ruptured releasing helium gas which extinguishes the flame.
<h3><u>Answer;</u></h3>
E. Horizon
<h3><u>Explanation;</u></h3>
A map is a symbolic representation of selected characteristics of a place or a given location. It present information about the world in a simple, visual way.
Several key features must be included on a map to aid the viewer in understanding the communication of a given map. They include;
- Legend; it serves as the decoder for the symbology in the data frame.
- Scale; explains the relationship of the date frame compared to the real world.
- Tittle; It instantly gives the viewer a succinct description of the subject matter of the map.
- Compass rose or North arrow
- Data frame, and
- Citation among others.
W=(m'/m)·100%
m'=37.2 g
m=48.5 g
w=(37.2/48.5)·100%=76.7%