Lakshmi has a sample of ammonium nitrate (NH4NO3) that has a mass of 40.10 g. She knows that the molar mass of NH4NO3 is 80.0432 g/mol. To the correct number of significant digits, how many moles of NH4NO3 does the sample contain?
Answers
The correct number of significant digits and moles of NH4NO is 0.500979 mol.
The molar mass is the mass of 1 mole of the substance.
- Ammonium nitrate, (NH4NO3), a salt of ammonia and nitric acid, is used widely in fertilizers and explosives. The commercial-grade contains about 33.5 percent nitrogen, all of which is in forms utilizable by plants; it is the most common nitrogenous component of artificial fertilizers.
- If the molar mass of nh4no3 is 80.0432 g/mol, that means there are 80.0432 g of substance in 1 mole. The question is how many moles is 40.10 g of substance.
80.0432 g : 1 mol = 40.10 g : x mol
By crossing the products:
Therefore:
x · 80.0432 g = 1 mol · 40.10 g
⇒ x = 40.10 ÷ 80.0432 mol
The correct number of significant digits and moles of NH4NO is 0.500979 mol.
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The question is incomplete, this is the complete question;
In the process of attempting to characterize a substance, a chemist makes the following observations. Which are physical properties and which are chemical properties?
(a) The substance is a silvery white, lustrous metal.
(b) The substance melts at 649 ∘C
(c) The substance boils at 1105 ∘C.
(d) The density of the substance at 20 ∘C is 1.738 g/cm³.
(e) The substance burns in air, producing an intense white light.
(f) The substance reacts with chlorine to give a brittle white solid.
(g) The substance can be pounded into thin sheets or drawn into wires.
(h) The substance is a good conductor of electricity.
Answer:
(a) Physical
(b) Physical
(c) Physical
(d) Physical
(e) Chemical
(f) Chemical
(g) Physical
(h) Physical
Explanation:
(a) The substance is a silvery white, lustrous metal - is appearance which is physical.
(b) The substance melts at 649 ∘C metling point is a physical measurement
(c) The substance boils at 1105 ∘C boiling point is a physical measurement
(d) The density of the substance at 20 ∘C is 1.738 g/cm3 how heavy a substance is,is physical.
(e) The substance burns in air, producing an intense white light. Burning is a chemical change. It is a reaction of a substance with oxygen
(f) The substance reacts with chlorine to give a brittle white solid. This is a chemical reaction as the question says.
(g) The substance can be pounded into thin sheets or drawn into wires. Ductility is a physical change, the substance remains chemically unchanged
(h) The substance is a good conductor of electricity. Any conductivity is physical, the substance remains chemically unchanged
Final answer:
The substance in question is likely a pure metal, more specifically Magnesium, because of its documented properties such as lustrous appearance, ability to be drawn into wires, and high electrical conductivity. Its properties like high melting and boiling points and its reactions suggest it could be from Group 1, but its ability to be formed into sheets and wires and its high conductivity suggest it's not an ionic compound like sodium chloride.
Explanation:
The substance described in the question seems to be an example of pure metal due to the properties like lustrous appearance, ability to be drawn into wires or pounded into sheets, and high conductivity of electricity. However, some of the properties like reaction with chlorine, production of intense white light upon burning in air, and its high melting and boiling points suggest that it could be a Group 1 element such as sodium or potassium, which are known for these characteristics. Coupled with information of its density and its ability to form brittle white solid upon reaction with chlorine, it seems to likely be Magnesium, a silvery-white lustrous metal.
Furthermore, ionic compounds like sodium chloride have high melting and boiling points, conduct electricity when molten, and ions are freed to move allowing conductivity. However, such compounds, unlike pure metals, cannot be drawn into wires or pounded into sheets and are usually brittle solids, which would make it less likely that the substance in question is an ionic compound.
The most confident identification will be based on the substance's observed physical and chemical properties and their comparison to known properties of pure metals and ionic compounds.
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b. H₂O
c. NH₃
d. NaCl
e. CO₂
Can anyone explain this one?
Answers
H2O: polar bonds, but there is a angle between 2 H-O bonds. so it's a polar molecule
NH3: polar bonds, but it's a stereochemical structure, like a pyramid with triangle base, N is the vertex. polar molecule.
NaCl: polar bond, polar molecule.(ion bond)
CO2: 2 O atoms are at two sides of C atom horizonally. giving CO2 a symmerical structure. it's nonpolar molecule with 2 polar bonds.
Final answer:
Carbon dioxide (CO₂) is a molecule with polar bonds but is considered nonpolar due to its linear shape.
Explanation:
In order to determine whether a molecule is polar or nonpolar, we must consider both the polarity of the individual bonds and the molecular geometry. A molecule with polar bonds can be nonpolar if the bond polarities cancel each other out due to the overall molecular shape.
Out of the given options, the molecule that has polar bonds but is nonpolar is CO₂. Carbon dioxide has two polar bonds between carbon and oxygen, but the molecule has a linear shape, which results in the bond polarities canceling each other out, making the molecule nonpolar.
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Answer : The correct option is, (1) ions.
Explanation :
According to the Arrhenius concept, an acid is a type of substance which ionizes in water to gives ions (hydronium ions or hydrogen ions) and a base is a type of substance which ionizes in water to gives
ions (hydroxide ions).
As we know that KOH is a base which ionizes in water to gives ions (hydroxide ions) and
ions.
Hence, potassium hydroxide is classified as an Arrhenius base because KOH contains ions.
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Answer:
a.) Angel food cake
Explanation:
The correct answer is a) Angel food cake. It is a type of cake made from egg-white foam and contains no fat.
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-10 m/s2
Explanation:
The acceleration is taken as −10 m/s2
Answer:
5
Explanation:
its in the middle
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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: