According to the concept of Avogadro's number, there are 1.499 moles of hydrogen gas contained in 9.03 x 10²³ molecules.
Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
Number of moles is calculated from Avogadro's number as, 1 mole=6.023×10²³ molecules , thus 9.03×10²³ molecules will have 9.03×10²³ /6.023×10²³=1.499 moles.
Thus, there are 1.499 moles of hydrogen gas contained in 9.03 x 10²³ molecules.
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Answer:
The correct answer is "Oxidation at the anode and reduction at the cathode".
Explanation:
A rechargeable battery is recharged by the movement of electrons from an external power source into the battery. In order to achieve this, two process take place inside the rechargeable battery: oxidation at the anode and reduction at the cathode. The electrons flow within the battery from the anode to the cathode, this happens by the oxidation of the anode (loss of electrons) and the reduction at the cathode (gain of electrons).
H2 + O2 -> H2O
If 20 g of hydrogen is reacted with 32 g of oxygen to produce 9 g of water, the percentage yield is 5%.
Percent yield is the ratio of the actual yield times the theoretical yield to 100. When the actual and theoretical yield are equal, the percentage yield is 100%. So if the actual yield is less than the theoretical yield then the percentage yield is less than 100%. This situation may arise due to the incompleteness of the reaction or the loss of the sample during the recovery process.
According to the stoichiometry of reaction of formation of water,
4 g hydrogen gives 36 g water, thus, 20 g hydrogen gives 20×36/4=180 g water which is theoretical yield.
So, the percent yield=observed yield/theoretical yield×100
percent yield=9/180×100=5%.
Thus, if 20 g of hydrogen is reacted with 32 g of oxygen to produce 9 g of water, the percentage yield is 5%.
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Answer:
12.5%
Explanation:
32/16 = 2 moles of oxygen
2 x 18.01 x 2/1 = 72.04 g of H2O
9/72.04 x 100 = 12.5%
balanced equation: 2H2 + O2 → 2H2O
limiting reactant is oxygen
Answer:
Water becomes hot when the chemical potential of the water is equal to the chemical potential of the water at the same temperature as the pan.
Which of the following compounds would be most effective in lowering the melting point of ice on roads? a) CaCl2 b) NaCl C) K3PO4 d) K2SO4
B. the epidermis consists of mostly adipose cells.
C. the epidermis is thicker.
D. the dermis is made of mostly dead cells