Answer:
Ok so I assume they gave u a reaction before asking this question. Look at that reaction and try to figure out what substances are changing in valency, if there is a substance(s) that doesn't change its valency then it's a spectator ion.
MMn = 54.94g/mol
MO2 = 2(16) = 32g/mol
MH = 1g/mol
MCl = 35.45g/mol
Molar Mass of MnO2:
54.94
+
2
(
16
)
=
86.94
Molar Mass of HCl:
1
+
35.45
=
36.45
Looking at the equation, we need a 4:1 ratio of HCl to MnO2 to make the reaction work, let's see if we have four times as much of the HCl.
Mols of MnO2:
42.7
86.94
=
0.49
Mols of HCl:
47.1
36.45
=
1.29
As we can see, we have less than the amount of HCl we need for all of the MnO2 to react, therefore the HCl is the limiting reactant.
For the theoretical yield of Cl2, we need to determine how many mols will be produced. As we can see by the equation, four mols of HCl make one mol of Cl2.
Molar Mass of Cl2:
35.45
⋅
2
=
70.9
Since we have 1.29mol of HCl, and we know it is the limiting reactant:
Mols of Cl2
1.29
4
=
0.323
Mass of Cl2 (Theoretical yield)
0.323
⋅
70.9
=
22.9
To calculate the actual yield, we multiply the theoretical yield by the final percentage:
22.9
⋅
0.791
=
18.11
Therefore, the actual yield of chlorine is 18.11
The density of an object that has a volume of 20.0 cm^3 and a mass of 40.0 grams is 2 g/cm^3
Mass
The definition of the word "mass" is the measurement of the amount of matter or substance, that is contained in an item. An object's mass increases with the amount of matter it contains.
<h3>Volume</h3>
The amount of three-dimensional space that an object or shape takes up is known as its volume. It is typically expressed in cubic units.
<h3>Density</h3>
The quantity of mass present in a substance at a given volume is referred to as density. The fundamental property of a substance is what explains how mass and volume are related (space occupied). It establishes how closely an object's molecules fit into the available space.
given that,
mass = 40.0 grams
volume =20.0 cm^3
Density =?
Density = mass / volume
=40.0 grams/20.0 cm^3
= 2 g/cm^3
The density of an object that has a volume of 20.0 cm^3 and a mass of 40.0 grams is 2 g/cm^3
Learn more about Density here:-
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Broken bones, torn ligaments...
Answer:
(a) 6332.812 N (b) 1469.59 pounds.
Explanation:
Given that,
The surface area of the top of yu head is 25 cm x 25 cm
Area = 625 cm² = 0.0625 m²
Atmospheric pressure on it is 101325 Pa.
(a) Pressure acting on an object is given by force acting per unit area. It can be written as :
6332.812 N of force is acting on your head at sea level.
(b) If area, A = 100 in²
We know that,
1 atm = 14.6959 pounds/in²
So, the force is 1469.59 pounds.