An unknown solid is placed on a scale and has a mass of 2.5 grams. The solid then displaces 35 mL of water in a graduated cylinder. Find the unknown solid’s density.
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Ответ:
The unknown solid’s density is 0.071
Explanation:
Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space. In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Archimedes' principle states that every body immersed in a fluid experiences a vertical and upward thrust equal to the weight of fluid dislodged. In other words, this principle says that the volume of the object is equal to the volume of the water displaced or displaced. So:
mass= 2.5 gramsvolume=35 mLReplacing in the definition of density:
you get:
The unknown solid’s density is 0.071
Ответ:
Answer : The volume of
produced are 90.7 liters.
Explanation :
The balanced chemical reaction will be:
First we have to calculate the moles of PbS.
Molar mass of PbS = 239.26 g/mole
Now we have to calculate the moles of
by using ideal gas equation.
Using ideal gas equation :
where,
P = Pressure of
gas = 2.00 atm
V = Volume of
gas = 123 L
n = number of moles
= ?
R = Gas constant =
T = Temperature of
gas = 
Putting values in above equation, we get:
The number of moles of
is, 6.07 mole
Now we have to calculate the limiting and excess reagent.
From the balanced reaction we conclude that
As, 3 mole of
react with 2 mole of 
So, 6.07 moles of
react with 
moles of 
From this we conclude that,
is an excess reagent because the given moles are greater than the required moles and 
is a limiting reagent and it limits the formation of product.
Now we have to calculate the moles of
From the reaction, we conclude that
As, 3 mole of
react to give 2 mole of 
So, 6.07 moles of
react to give 
moles of 
Now we have to calculate the volume of
produced at STP.
As, 1 mole of
contains 22.4 L volume of 
So, 4.05 mole of
contains 
volume of 
Therefore, the volume of
produced are 90.7 liters.