Hello!
1) What is the limiting reactant?The chemical equation for the reaction is the following:
Fe + S → FeS
To determine the limiting reactant, we will determine the
moles of each reactant and divide it by the coefficient in the chemical equation (In this case is I for each one)
![moles Fe=15,24 g Fe * \frac{1 mol Fe}{55,845 g Fe}=0,2729 mol Fe \\ \\ moles S=17,34 g S* \frac{1 mol S}{32,065 g S}= 0,5408 mol S](https://tex.z-dn.net/?f=moles%20Fe%3D15%2C24%20g%20Fe%20%2A%20%5Cfrac%7B1%20mol%20Fe%7D%7B55%2C845%20g%20Fe%7D%3D0%2C2729%20mol%20Fe%20%5C%5C%20%5C%5C%20moles%20S%3D17%2C34%20g%20S%2A%20%5Cfrac%7B1%20mol%20S%7D%7B32%2C065%20g%20S%7D%3D%200%2C5408%20mol%20S%20)
Now, the reactant with the less number of moles is Fe, so
Fe is the limiting reactant.
2) The reactant in excess.
From the chemical reaction:
Fe + S → FeS
The reactant in excess is the one that is in the
highest amount. To determine which is the reactant in excess we need to calculate the moles of each reactant and divide by the coefficient in the chemical reaction:
![moles Fe=15,24 g Fe * \frac{1 mol Fe}{55,845 g Fe}=0,2729 mol Fe \\ \\ moles S=17,34 g S* \frac{1 mol S}{32,065 g S}= 0,5408 mol S](https://tex.z-dn.net/?f=moles%20Fe%3D15%2C24%20g%20Fe%20%2A%20%5Cfrac%7B1%20mol%20Fe%7D%7B55%2C845%20g%20Fe%7D%3D0%2C2729%20mol%20Fe%20%5C%5C%20%5C%5C%20moles%20S%3D17%2C34%20g%20S%2A%20%5Cfrac%7B1%20mol%20S%7D%7B32%2C065%20g%20S%7D%3D%200%2C5408%20mol%20S%20)
The reactant in excess is S, the amount that is left after the reaction is:
![molS_{ex}=molS-molFe=0,5408molS-0,2729molFe \\ \\ = 0,2679 mol S](https://tex.z-dn.net/?f=molS_%7Bex%7D%3DmolS-molFe%3D0%2C5408molS-0%2C2729molFe%20%5C%5C%20%5C%5C%20%3D%200%2C2679%20mol%20S)
So there are
0,2679 moles of S in excess after the reaction.
3)
What mass of FeS is created?To determine the mass of FeS created we need to go from moles of Fe (Limiting reactant) to grams of FeS (Product) using the following conversion factor:
![0,2729 moles Fe* \frac{1 mol FeS}{1 mol Fe} * \frac{87,91 g FeS}{1 mol FeS}=23,99 g FeS](https://tex.z-dn.net/?f=0%2C2729%20moles%20Fe%2A%20%5Cfrac%7B1%20mol%20FeS%7D%7B1%20mol%20Fe%7D%20%2A%20%5Cfrac%7B87%2C91%20g%20FeS%7D%7B1%20mol%20FeS%7D%3D23%2C99%20g%20FeS%20)
So,
23,99 grams of FeS are produced from this chemical reaction.
Have a nice day!
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For the first question, the property of gas that allows them to be stored in a bottle of air freshener is that gases are compressible. They follow the volume where they are stored.
For the second question, at the molecular level the molecules of the ice cream gains more kinetic energy as it is melting turning it into a liquid where the molecules now are loosely packed and collisions of each molecule decreases. This process is called melting.
The third question defines a gas where the molecules are far from each other and are at constant random motion. Also, from the kinetic molecular theory there is no forces of attraction between the molecules for a gas.
Answer:
The weight changes, but his or her mass does not.
Explanation:
The true statement from the given choices about an astronaut traveling from planet to planet is that the weight changes but his or her mass does not.
This is due to the difference in acceleration due gravity from one planet to the other.
- Mass is the amount of matter present within a substance.
- Weight is the vertical force on a body due to its mass and acceleration due gravity
Gravity from one planet to the other differs significant and so is the weight.
Answer: Option (c) is the correct answer.
Explanation:
In liquids, molecules are held by slightly less strong intermolecular forces of attraction as compared to solids.
Hence, molecules of a liquid are able to slide past each other as they have more kinetic energy than the molecules of a solid.
As a result, liquids are able to occupy the shape of container in which they are placed. Also, liquids have fixed volume but no fixed shape.
Thus, we can conclude that liquids have a variable shape and a fixed volume.