Answer:
N2O3
Explanation:
1. You have 19.7 grams of a material and wonder how many moles were formed. Your
friend tells you to multiply the mass by grams/mole. Is your friend correct?
Hint Set in the solution an
Answer:
No. If you were to set up what the friend said it would look like this:
19.7g × [tex]\frac{grams}{moles}[/tex] ==> [tex]\frac{19.7 grams}{1}[/tex] ×
The above does not look right because the grams do not cancel out. If it's not cancelled, it would be included in your final answer, but you're looking for moles not grams.
When setting up a stoichiometry equation, you have to put the same unit of measurement (ex- grams, cm, mm, etc.) on the numerator of one side and the denominator of the other side.
This would cancel out the unit.
For example: If you wanted to find out how much of 320 cm are in a meter.
*there are 100 cm in 1 meter*
(1. always start with the given number!)
(2. set up the next fraction where you can cancel out cm)
[tex]\frac{320cm}{1}[/tex] × [tex]\frac{1 meter}{100 cm}[/tex] = 3.2 m
Going back, your friend would have to switch the units from grams/moles to moles/grams. It would cancel out grams, which would leave moles. Therefore, moles will be included in your final answer.
[tex]\frac{19.7 grams}{1}[/tex] × [tex]\frac{moles}{grams}[/tex] = _?_ moles
You will take the ratio of mass and molar mass. Hence my friend is wrong.
Number of moles and molar massThe formula for calculating the number of moles is expressed as:
[tex]Moles=\frac{mass}{molar mass}[/tex]
Given the following
Mass = 19.7 grams
Since the molar mass is measured in gram per mole, hence to get the number of moles, you will take the ratio of mass and molar mass. Hence my friend is wrong.
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Base your answers to the following questions on the system at equilibrium:
2C(s) + 2H2(g) + 52.4kJ ⇋ C2H4(g)
Which direction will the system shift when the temperature is decreased?
Describe what will happen to the concentration of hydrogen gas when the temperature is increased.
State one way in which you could increase the concentration of C2H4.
Answer:
when the temperature is decrease the concentration will shift the equilibrium to left sideWhat step in the water treatment process involves the removal of sediment?
A.
aeration
B.
desalination
C.
filtration
Guys help I got 22 minutes left please
What percentage of a substance remains after 7 half-lives have passed?
A. 0.39
B. 2.5
C. 1.25
D. 0.78
Answer:
Not really sure, buts its either B or C.
Use the drop-down menus to identify the class of compounds to which each structure belongs.
(use image [brainliest will be given])
Answer:
Use the drop-down menus to identify the class of compounds to which each structure belongs.
✔ carboxylic acid
✔ ether
✔ alkyl halide
✔ amine
The class of compounds of structure given as below:
A. Carboxylic acid
B. Ether
C. Alkyl Halide
D. Amine
What are compounds ?A chemical compound is a material that contains atoms from many chemical elements bonded together by chemical bonds. It is made up of numerous similar molecules. Hence, a molecule made up of only one type of atom is not a compound.
Ionic compounds, covalent compounds, and organic compounds are a few different types of chemical compounds. Ions, which are charged particles, make up ionic compounds.
Atoms that share electrons are the building blocks of covalent molecules. Carbon atoms are covalently bound to hydrogen atoms in organic molecules.
-COOH group represents carboxylic acid, -o- represents ether, -Cl is alkyl halide and NH2R is amine.
Thus, The class of compounds of structure is Carboxylic acid.
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Coca-Cola has 2.2 grams of carbon dioxide gas, CO2 in each 335ml can. What is the molarity of CO2 in Coca-Cola?
a. 0.14 M
b. 0.0066 mol/L
c. 0.028 mol/L
d. 0.41 mol/L
Answer:
a. 0.14 M
Explanation:
Molarity is the molar concentration of a solution and can be calculated using the formula below:
Molarity (mol/L) = number of moles (lol) ÷ volume (L)
To convert the mass of CO2 to moles, we use the formula: mole = mass/molar mass.
Molar mass of CO2 = 12 + 16(2)
= 12 + 32
= 44g/mol
mole = 2.2/44
mole = 0.05mol
Volume of can = 335mL = 335/1000 = 0.335L
Molarity = n/V
Molarity = 0.05/0.335
Molarity = 0.149
Molarity = 0.14 mol/L or M
Which elements above will form cations? List them below.
a) Lithium
b) sodium
c) beryllium
d) aluminum
e) phosphorus
f) oxygen
g) fluorine
Answer:
Halogens always form anions, alkali metals and alkaline earth metals always form cations. Most other metals form cations (e.g. iron, silver, nickel), whilst most other nonmetals typically form anions (e.g. oxygen, carbon, sulfur).
Explanation:
Examples: Sodium (Na+), Iron (Fe2+), Ammonium (NH4
Lithium, Sodium, Beryllium, and Aluminum elements form cations.
What is Cation and Anion ?Cations means positively charged ions. Element which forms cation is Metal. Cations formed at cathode.
Anions means negatively charged ions. Element which form anions is Non metal. Anions formed at anode.
Now check one by one which elements will form cations:
(a) Lithium form cation [tex](Li^{+})[/tex], because lithium loses its electron and it form positive charge.
(b) Sodium form cation [tex](Na^{+})[/tex], since sodium is a alkali metal and sodium has tendency to lose an electron.
(c) Beryllium form cation [tex](Be^{2+})[/tex], because it donates or loses two electrons to become stable.
(d) Aluminum form cation [tex](Al^{3+})[/tex], because it loses its three electrons and has a three positive charge.
(e) Phosphorus form anion [tex](P^{3-})[/tex] , since phosphorus is a non-metal.
(f) Oxygen atom exists as neutral it neither form cation nor anion.
(g) Fluorine form anion [tex](F^{-})[/tex], because fluorine atom gains an electron.
Thus, from above conclusion we can say that Lithium, Sodium, Beryllium, and Aluminum elements form cations.
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Calculate how many grams of sodium chloride we would need to make a solution with the same molarity of seawater, which is about 0.598 M.
Answer:
34.92 grams NaCl (in 1 L of solution)
Explanation:
The chemical formula of sodium chloride is NaCl. From the formula, we can calculate the molar mass of NaCl:
MM(NaCl)= MM(Na) + MM(Cl) = 23 g/mol + 35.4 g/mol = 58.4 g/mol
A solution of NaCl with a molarity of 0.598 M has 0.598 moles of NaCl per liter of solution. So, we multiply the moles by the molar mass of NaCl to calculate the mass we need:
mass of NaCl = 0.598 mol x 58.4 g/mol = 34.92 g NaCl
Therefore, we need 34.92 grams of NaCl to prepare 1 liter of a solution with a molarity of 0.598 M.
Mendel crossed tall pea plants with short pea plants. the offspring were all tall plants.
1. Which allele is recessive?
2. Which allele is dominant?

please hurry
Answer:
1. short allele
2.tall allele
Calculate the number of grams in 260 mL ( 1000mL = 1 L) of a 0.55 M solution of NaCl. (1
mol = 58 g)
Answer:
8.29g NaCl are present
Explanation:
To solve this question we must, as first, find the moles of NaCl in 260mL of the solution. These moles can be converted to grams using its molar mass (NaCl = 58g/mol)
Moles NaCl:
260mL * (1L / 1000mL) = 0.260L * (0.55mol / L) = 0.143 moles NaCl
Mass NaCl:
0.143 moles NaCl * (58g / mol) = 8.29g NaCl are present
What is the number of moles in a sample of gas that has a volume of 3.5 L, a
pressure of 200 kPa, and a temperature of 300 K?
Explanation:
[tex]PV = nRT \\ (200000 \times 3.5 \times {10}^{ - 6} ) = n \times 8.314 \times 300 \\ n = \frac{0.07}{2494.2 } \\ n = 2.81 \times {10}^{ - 5} [/tex]
[tex] \small{ \star{ \underline{ \blue{ becker}}}}[/tex]
What is the volume in liters that is needed to create a 0.5 M solution with 4.9 moles of Fe(OH)2? Round your answer to 1 decimal.
Answer:
[tex]0.5\: moles\: occupies \: 1 \: litre \\ 4.9 \: moles \: will \: occupy \: ( \frac{4.9}{0.5} ) \: moles \\ = 9.8 \: litres[/tex]
no one ever answers my question I will give brainiest and everything
While visiting the beach during summer vacation, a sea breeze keeps you cool and comfortable during the hottest part of the day. Which BEST explains why this happens?
Your answer:
warm air rising over land allows cooler air from the ocean to blow inland
cool air rising over land allows warm air from the ocean to blow inland
there are similarities in temperature between the land and the water
Answer:
warby hair rising over land allows cooler air from the ocean to blow below.
The concentration of a potassium manganate(VII) solution (KMnO4) is 10 g /l . What is the concentration of this solution in molarity?
Answer:
Have anyone found the answer to this? I’m on this grade result course right now
Explanation:
The concentration of a potassium manganate(VII) solution (KMnO4) is 10 g /L. What is the concentration of this solution in molarity is 0.06 M.
What is the molarity?The ratio of number of moles of solute to the volume of the solution in litre is called molarity. it is denoted by symbol M.
Given concentration (C) of potassium manganate(VII) solution in g/L is 10 g /L
Molarity = C/molar mass of KMnO4 = 10g/L ÷ 158.02g/mol = 0.06 mol/L
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Al(s) + HCl(aq)-AlCl3(aq) + H2(g)
what are the products of this reaction
Need help on this question asap pleasee
Answer:
9.0 moles of CaO
Explanation:
We have the reaction equation as follows;
Fe2O3 + Ca3(PO4)2 -------> 2FePO4 + 3CaO
Now we know from the equation that;
1 mole of iron III oxide yields 3 moles of CaO
Therefore;
3 moles of iron III oxide yields 3 * 3/1
= 9.0 moles of CaO
How are humans activity contributing to climate change?
Answer:
Some human activities that contribute to climate change would be fracking, driving vehicles, deforestation, and developing cities. Fracking releases methane and other greenhouses gases into the atmosphere. Driving vehicles, like cars or trains, also releases carbon dioxide into the atmosphere. Deforestation decreases the amount of oxygen being produced. Developing cities also contributes because it consumes almost 80% of the world's energy, as well as producing 60% of the greenhouse gases.
2Al (s) + 3Cl2 (g) --> 2AlCl3 (s) (balanced)
When 52 grams of chlorine gas react, the actual yield is 42.5 grams, what is the
percent yield?
Answer:
Percent yield = 65.2 %
Explanation:
The reaction determines this:
2 moles of Al react to 3 moles of chlorine gas in order to produce 2 mol of aluminum chloride.
We determine the moles of chlorine:
52 g . 1mol /70.9g = 0.733 moles of Cl₂
3 moles of gas can produce 2 moles of salt
Then, our 0.733 moles may produce (0.733 . 2) / 3 = 0.489 moles of AlCl₃
We convert moles to mass to predict the 100 % yield
0.489 mol . 133.3 g /mol = 65.19 g
Percent yield = (Yield produced / 100 % yield) . 100
Percent yield = (42.5 g / 65.19g) . 100 = 65.2 %
Pleaseee helpppppppp
Answer:
Potassium
1s2 2s2 2p6 3s2 3p6 4s1
Explanation:
The atom having only one electron its outermost shell must belong to an element in group one of the periodic table.
Having noted that, we proceed to find out what element in group one that has the atom just described in the question.
That atom must belong to an element in the fourth period. The only group 1 element in the fourth period is potassium.
The electron configuration of potassium is;
1s2 2s2 2p6 3s2 3p6 4s1
Arrange ionic compounds in order of decreasing amount of energy released in lattice formation .NaF,MgS,TLN and
The question is incomplete, the complete question is;
Arrange the following ionic compounds in order of decreasing amount of energy released in lattice formation: NaF, MgS, TlN, and CsI.
Answer:
TlN> MgS > NaF > CsI
Explanation:
Recall that lattice energy is the energy evolved when a crystal lattice is formed from its component ions.
The lattice energy depends on the size of the ions. The smaller the sizes of the ions, the larger the lattice energy.
The order of energy released in lattice formation for these compounds is;
TlN> MgS > NaF > CsI
In which of the following situations would the energy of a system have to decrease?
Answer:
If an object falls from one point to another point inside a gravitational field, the force of gravity will do positive work on the object, and the gravitational potential energy will decrease by the same amount
How has the Chesapeake Bay watershed changed over time?
Answer:
The Chesapeake Bay watershed continues to develop as population in the region grows. Development and urbanization at the cost of natural landscapes can lead to increased pollution of nutrients and sediment to the Bay, especially from stormwater runoff.
Explanation:
what is the symbiotic relationship of bighorn sheep and worms
Answer:
Lungworms live in the lungs of bighorn sheep causing them to be sick, or even die.
Explanation:
hope this helps
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g EXPERIMENT 1: Calculate the density, record the melting point and the solubility (soluble, partially soluble, and not soluble) in water of the solid substance that you determined in this experiment. Density, melting point and solubility of the solid are intensive properties.
Answer:
If the data is given we can find out the density, melting point and solubility by using the formula given below.
Explanation:
Density is defined as mass of the substance per unit volume of the solution and its formula is p = mass / volume. We can calculate melting point by noting the temperature at which the particular substance starts melting. Solubility refers to the maximum amount of a substance or solute that can be dissolved in a solvent at a given temperature. Divide the mass of the compound by the mass of the solvent and then multiply by 100 g we get solubility in g or in 100g.
how refrigerator magnets work
Answer:
Explanation:
Fridge magnets are made of weakly ferromagnetic ceramics like barium ferrite or strontium ferrite. The magnetic field created by the fridge magnet aligns the spins of unpaired electrons in metal atoms in the fridge in such a way that the magnet and the fridge door are attracted to each other; this force keeps the magnet stuck to the fridge.
Answer:
the fridge is a magnet
Explanation:
magnets connect to fridge
Make a line graph of the data found above. On the same graph, show the average number of paper clips
each electromagnet picked up for each voltage tested. Plot the voltage on the x-axis and the average
number of paper clips picked up on the y-axis. Scale the x-axis in intervals of 1.5 volts and scale the y-axis in intervals of 5 paper clips.
Answer:
I tried my best lol, but here's what I put. I hope this helped a bit
The graph of the voltage on the x-axis and the average number of paper clips picked up by the electromagnet on the y-axis is shown in the picture attached.
What is an Electromagnet ?An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.
It usually consist of wire wound into a coil. When current is passed through the wire a magnetic field is created which is concentrated in the hole, denoting the center of the coil.
The Battery voltage was plotted on the x axis and the average paper clips picked up by 25 turn electromagnet and 50 turn electromagnet was plotted on y axis and the following graph was obtained.
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*
1. The phrase "freedom of movement' means
the energy that an object has because it is moving
the
way
molecules in a substance move around relative to each other
O a pull between two molecules that is always the same for a substance
a noticeably different form or state of the same substance
Answer:
molecules in a substance move around relative to each other
Explanation:
It means that molecules of a substance are mobile or locomotive or localised.
such as gases
What is the minimum amount of material that must be present in a living organism?
Answer:
Living things can have a minimum of one cell
Explanation:
Living things can have a minimum of one cell; these are called unicellular organisms. Some examples of unicellular organisms: bacteria, algae (plants), some fungi, and protozoa
hope this helps!
In an ecosystem ,cell is the minimum amount of material that must be present in a living organism.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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The rate constant for a first order reaction
is 2.80-10-35-1 at 60.0°C. The rate
constant at 45.0°C is 4.80.10-4 5-1. What
is the activation energy for the reaction?
[ ? ]kJ/mol
Recall that R = 8.314 J/mol K
Answer:
E_a = 103.626 × 10³ KJ/mol
Explanation:
Formula to solve this is given by;
Log(k2/k1) = (E_a/2.303R)((1/T1) - (1/T2))
Where;
k2 is rate constant at second temperature
k1 is rate constant at first temperature
R is universal gas constant
T1 is first temperature
T2 is second temperature
We are given;
k1 = 2.8 × 10^(-3) /s
k2 = 4.8 × 10^(-4) /s
R = 8.314 J/mol.k
T1 = 60°C = 333.15 K
T2 = 45°C = 318.15 K
Thus;
Log((4.8 × 10^(-4))/(2.8 × 10^(-3))) = (E_a/(2.303 × 8.314))((1/333.15) - (1/318.15))
We now have;
-0.76592 = -0.00000739121E_a
E_a = -0.76592/-0.00000739121
E_a = 103.626 × 10³ KJ/mol