Using the Law of Conservation of Matter, determine the number of grams of iron sulfide (FeS) that will be produced in this reaction 112g Fe + 64g S → _____ g FeS. A. 48 grams B. 64 grams C. 112 grams D. 176 grams


Answer 1
Answer: The Law of Conservation of Mass states that the mass of reactants entering a reaction must be equal to the mass of the products exiting it. In this case, we only have 2 reactants, Fe and S, and we only have 1 product, FeS. Therefore we expect the total mass of the Fe and S reactants to equal the mass of FeS. This gives us 112 g + 64 g = 176 g of FeS, which is choice D.

Answer 2
Answer: In the Law of Conservation of Matter, the mass in should be equal to the mass out. So, for the reaction, 

112g Fe + 64g S →_____ g FeS

Mass in is equal to 112 g plus 64 g which is 176 g. Therefore, the correct answer among the choices is option D.

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How is the earth like a gigantic recycling center


Answer: The earth is like a recycling center because as things are being used other organisms can use their waste to live.

Explanation: The cycle is cyclic allowing for the cycle to never end unless things are destroyed.


A reaction vessel for synthesizing ammonia by reacting nitrogen and hydrogen is filled with 6.04 kg H2 and excess N2. If 28.0 kg NH3 is produced, what is the percent yield of the reaction?



81.8 %


The balanced equation for the reaction is  ⇒  

So to find the number of moles of we do 6.04kg ÷ 2 = 3.02 moles.

The mole ratio between and is 3:2. So to find the number of moles you do   × 2 which gives you 2.0124 moles.

Then you find the mass by doing moles multiplied by Mr:  2.0124 x 17 which gives you 34.21 kg.

Then to find the percentage yield you do:   x 100 = 81.82.......

Which is 81.8 %


What is the name of an atoms inner region


Im pretty sure it's the nucleus


What differs between a radioactive isotope and a stable isotope? A. Radioactive isotopes last longer. B. Radioactive isotopes last for less time. C. There is no difference. D. Stable isotopes are shorter.


"Radioactive isotopes last for less time" is the one among the following choices given in the question that shows the way a radioactive isotope and a stable isotope differs. The correct option among all the options that are given in the question is the second option or option "B". I hope that the answer has helped you.

B. Radioactive isotopes last for less time, is the one that makes the most since of the  following options in the question above it shows the way a radioactive isotope and a stable isotope differs. A radioactive isotope lasts for less time because it is not stable.

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