The empirical formula is No2 and molecular formula is N2O4
find the moles of each reactant
=% composition/molar mass
molar mass of oxygen=16 g/mol ,while hat of nitrogen= 14 g/mol from periodic table
moles is therefore=
nitrogen= 30.43/14=2.174 moles
oxygen= 69.57/1 6=4.348 moles
find the mole ratio by dividing each moles with smallest number of mole( 2.174)
nitrogen = 2.174/2.174= 1
oxygen = 4.348/2.174=2
therefore the empirical formula= NO2
molecular formula calculation
[NO2] n= 92.02 amu
[(14) + (16x2)]n = 92.02 amu
46n= 92.02
divide both side by 46
n=2
therefore the molecular formula is gotten by multiplying the empirical formula by 2= [NO2]2= N2O4
The safest method for diluting concentrated sulfuric acid with water is to add acid to water. This way, when spill occurs, the acid is already diluted and less harmful than adding water to acid.
B. Protect the iron from polluted air.
C. Add carbon to the iron.
D. Let the iron develop a natural coat of carbonate.
B. different masses and a different number of molecules
C. equal volumes and the same number of molecules
D. different volumes and a different number of molecules
Answer is C - equal volumes and the same number of molecules.
Explanation;
Let's assume that CO and CO₂ are ideal gases. Then we can use ideal gas law, PV = nRT
Where, P is the pressure of the gas (Pa), V is the volume of the gas (m³), n is the number of moles of gas (mol), R is the universal gas constant ( 8.314 J mol⁻¹ K⁻¹) and T is temperature in Kelvin.
The temperature and the pressure of the both gases are same. Volume is also same as 1.0 L. R is a constant. So according to the formula, both gases have same number of moles. According to the Avogadro's constant, 1 mole has 6.022 x 10²³ particles.
number of molecules = Avogadro's constant x number of moles.
Hence, under the same conditions both gases have same number of molecules.
parasitism
B.
amensalism
C.
commensalism
D.
symbiosis
Answer: C: commensalism please give me hearts and stars because the answer is right!!
Explanation:
The relationship between the clown fish and the deadly sea anemone can be classified as commensalism. Though the sea anemone’s tentacles are covered with thousands of nematocysts (tiny, venomous harpoons), the clown fish is protected by a thick coat of mucus and is not harmed by the anemone’s venom. The clown fish is therefore protected from predators and is also able to get leftover food from the anemone's meals. Since the clown fish ultimately benefits from this arrangement and the sea anemone neither benefits nor suffers because of the clown fish, the relationship is commensalistic.
The clown fish and the sea anemone exhibit a mutualistic relationship, where both organisms benefit. However, among the options provided in the question, the most accurate is 'symbiosis', which broadly denotes a close, long-term interaction between different biological species.
The symbiotic relationship between the clown fish and the sea anemone is referred to as mutualism. This term, which is missing from the options, indicates a relationship in which both organisms benefit. The clown fish is protected from predators and has access to food remnants, whereas the sea anemone gets cleaned by the clown fish, which removes parasites and debris. Among the options provided, the closest would be symbiosis (option D), as it describes a close, long-term interaction between different biological species, which can include mutualism, commensalism, and parasitism.
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Answer: lower freezing point and a higher boiling point than water
Explanation:
Addition of a non volatile solute leads to elevation in boiling point and depression in freezing point.
This increase in boiling point arises because particles of the non-volatile solute occupy the surface of solution due to which solvent particles can not escape out of the solution. Hence, high amount of heat is required for the solute particles to escape out of the solution. Therefore, an increase in boiling point will occur.
Also as vapor pressure of solution becomes less, the freezing point gets depressed as freezing point is the temperature at which vapor pressure of solid becomes equal to the vapor pressure of solution.
Thus at standard pressure when NaCl is added to water,the solution will have a lower freezing point and a higher boiling point than water