Answer:
b) 10 g
Explanation:
Hi, the answer in simply: during a chemical reaction (that doesn't involve nuclear processes) the total mass involved is constant.
The total mass of the reactants equals the total mass of the products, althought the number of molecules may vary.
n(2Fe2O3)=10g/319.374amu=0.03mol
n(4Fe+3O2)=0.03 mol
m(4Fe+2O2)=Mn=319.374×0.03=9.58=10
1.5 mol H20
2.5 mol H20
O 3.5 mol NO2
O 1.0 mol NO2
Answer:
3.5 moles of NO2.
Explanation:
The balanced equation for the reaction is given below:
3NO2 + H2O —> NO + 2HNO3
Next, we shall determine the excess reactant. This is illustrated below:
From the balanced equation above,
3 moles of NO2 reacted with 1 moles H2O.
Therefore, 6.5 moles of NO2 will react with = (6.5 x 1)/3 = 2.17 moles of H2O.
From the above calculations, we can see that it will take a higher amount i.e 2.17 moles than what was given i.e 1 mole of H2O to react completely with 6.5 moles of NO2.
Therefore, NO2 is the excess reactant and H2O is the limiting reactant.
Next, we shall determine the number of mole of the excess reactant that reacted in the reaction. This is illustrated below:
From the balanced equation above, we can see that 3 moles of NO2 reacted with 1 mole of H2O.
Finally, we shall determine the leftover mole of the excess reactant after the reaction. This is illustrated below:
Given mole of NO2 = 6.5 moles
Reacted mole of NO2 = 3 moles
Leftover mole of NO2 =...?
Leftover mole = Given mole – Reacted mole
Leftover mole of NO2 = 6.5 – 3
Leftover mole of NO2 = 3.5 moles.
Therefore, 3.5 moles of NO2 remained after the reaction.
Answer:
Lead
Explanation:
One that I know is lead.
Isotopes refer to different forms of the same element having identical number of protons but varying number of neutrons. Examples of isotopes with equal number of protons and neutrons include Carbon-12 and Deuterium. These isotopes, including the unstable ones termed as 'radioactive isotopes', contribute significantly to an element's atomic mass.
Isotopes are alternate forms of the same element that have the same number of protons but a different number of neutrons. When an isotope has the same number of protons and neutrons, it can be found in lighter elements such as carbon and hydrogen. A good example is the isotope Carbon-12 (with six protons and six neutrons) which is a common isotope of carbon found on Earth. Another example is Hydrogen-2 or Deuterium (with one proton and one neutron). This is because the number of protons (also known as the atomic number) identifies an element - regardless of the number of neutrons.
The presence of isotopes is important in elements as they contribute to the overall atomic mass and affect the behavior of the element. For instance, radioactive isotopes, such as Carbon-14, are unstable and can emit subatomic particles or energy to attain a lower potential energy state, which explains why they're used in radioactive dating methods.
It's worth noting that the number of neutrons in an atom can vary and is not necessarily equal to the number of protons, especially in heavier elements.
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Intertidal zone is the shallowest part of an ocean ecosystem where the depth is not too much.
An Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
Learn more about ecosystem,here:
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If there are 14 chromosomes in pea plant cells, there are 7 chromosomes present in a gamete cell of a pea plant.
Chromosomes are thread like structure which are present in pair.
The chromosomes contain re genes and characters of the person.
The process of meiosis, result in half of chromosome in the daughter cells.
Thus, there would be 7 chromosomes present.
Learn more about chromosomes
Answer:
1.54x10^24
Explanation:
To convert moles to molecules, multiply the number of moles by Avagadro's number (6.02x10^23).
2.56mol × 6.02x10^23 = 1.54x10^24