Five liters of gas at STP have a mass of 12.5 g. What is the molecular mass of the gas? a. 12.5 g/mol
b. 25.0 g/mol
c. 47.5 g/mol
d. 56.0 g/mol
e. 125 g/mol
Answers
Step 1: You must find the mol amount of that 12.5g mass.
12.5 / 5 = 2.5 mol
Step 2: Now find the molecular mass of that gas "at STP" (STP- is 22.4 L)
2.5 x 22.4 = 56 g/mol
Good Luck on Chemistry SAT, cause I know exactly where you got this question from.
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92.2 km + 9426 m =
km
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Answer:101.6
Explanation:
to convert m into km we have to divide it by 1000.so,
9426/1000=9.426km
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Answer:
The heat of vaporization relates the amount of heat required to transform a certain phase of a certain amount of substance from liquid to gas. The heat of vaporization of substances can be expressed in terms of joules per gram or joules per mole.
ExplanaDetermine the total amount of heat, q, that is required to evaporate the given amount of water at its boiling point. For this problem, we simply apply the equation,q
=
m
Δ
H
v
a
p
where m is the mass and
Δ
H
v
a
p
is the enthalpy of vaporization of water. We use the following values:
m
=
100
g
Δ
H
v
a
p
=
2.26
k
J
/
g
We proceed with the solution.
q
=
m
Δ
H
v
a
p
=
(
100
g
)
(
2.26
k
J
/
g
)
=
226 k
j tion:
of the water and object is 124.3 cm3
. What is the density of the metal?
Answers
(124.3 - 118.2) = 6.1 cm³
The density of the lump is (mass)/(volume) = 44 / 6.1 = 7.21 gm per cm³.
Answers
Magnetism is not a major characteristic used to identify minerals, because, every mineral do not have magnetic properties in it. Only few minerals like Iron-nickel have it and thus, it is not possible to identify a mineral using magnetism.
Answers
Answer:
This reaction is completed by a double displacement
A double displacement occurs when two different salts are mixed in an aqueous state, since when they dissolve a salt their ions are dissociated and when mixed with another salt in an aqueous state they combine and form two new compounds
Double displacement reactions
The reaction goes to completion because it has the same amount of elements in the reactants and products.
Answers
Answer:
The reaction rate will be multiplied by four.
Explanation:
The reaction rate is the measure of how fast a reaction is happening, and it can be calculated by how fast the reactants are disappearing, or how fast the products are being formed.
For a generic reaction:
A → B + C
The rate (r) is:
-r = k*[A]ⁿ
The minus signal refers to the disappearing of the reactant, k is the velocity constant of the reaction, and n is the reaction order. So, for a second-order reaction:
-r = k*[A]²
If the concentration of A is doubled: [A]' = 2[A]
-r' = k*(2[A])²
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-r' = 4*(-r)