% composition = Ar/Mr x 100%
MM (molar mass) ZnSO₄ = 161 g/mol
AM (atomic mass) Zn = 65.38 g/mol
% Zn = 65.38/161 x 100% = 40.6%
AM (atomic mass) S = 32 g/mol
% Zn = 32/161 x 100% = 19.9%
AM (atomic mass) O = 16 g/mol
% Zn = 4.16/161 x 100% = 39.6%
how many iron atoms are there in 5.33 mol of iron(iii) chloride
Answer:
The formula shows that there is one atoms of iron in each formula unit of FeCl3, and by definition the number of molecules or formula units in a mole is Avogadro's Number. Therefore, 5.33 moles contains 5.33 X Avogadro's Number of atoms, which is 3.21 X 1024 atoms, to the justified number of significant digits.
Answer:
The formula shows that there is one atoms of iron in each formula unit of FeCl3 , and by definition the number of molecules or formula units in a mole is Avogadro's Number . Therefore , 5.33 moles contains 5.33 X Avogadro's Number of atoms , which is 3.21 X 1024 atoms , to the justified number of significant digits .
Given that Delta. G for the reaction below is –957. 9 kJ, what is Delta. Gf of H2O? 4NH3(g) 5O2(g) Right arrow. 4NO(g) 6H2O(g) Delta. Gf,NH3 = -16. 66 kJ/mol Delta. Gf,NO = 86. 71 kJ/mol –228. 6 kJ/mol –206. 4 kJ/mol 46. 7 kJ/mol 90. 7 kJ/mol.
ΔG for the formation of H₂O is -228.6 kJ.
How we calculate Gibb's free energy of the reaction?Gibb's free energy of the reaction is calculated as:
ΔG = G for product - G for reactant
Given chemical reaction is:
4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)
In the question, given that:
ΔG for the reaction = -957. 9 kJ
ΔGf of NH₃ = -16. 66 kJ/mol
ΔGf of NO = 86. 71 kJ/mol
Equation for ΔG will be written as:
ΔG = (ΔGf of NO + ΔGf of H₂O) - (ΔGf of NH₃+ ΔGf of O₂)
ΔGf of O₂ = 0
-957. 9 = (4×86. 71 + 6×ΔGf of H₂O) - (4×-16. 66 + 5×ΔGf of O₂)
-957. 9 = 346.84 + 6ΔGf of H₂O + 66.64
ΔGf of H₂O = (-957. 9 - 346.84 - 66.64) / 6
ΔGf of H₂O = -228.56 kJ ≅ -228.6 kJ
Hence, option (1) is correct i.e. -228.6 kJ is the ΔGf of H₂O.
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As the rate of physical weathering increases, the amount of chemical weathering also increases because
Answer:
Hehe!
Explanation:
Because Increased surface area provides more surface for chemical weathering to attack the rock,allowing chemical weathering to speed up.
Which of the following substances dissolves most readily in water?
a. CH
c. NH3
b. BaSO4
d. CaCO3
Does silver change color in the presence of poison.
Write the expressions for the equilibrium constants of the reactions below.
a.N2 () + 3H2 () ⇌ 2NH3 ()
b. Br2 () + H2 () ⇌ 2HBr ()
c.CO () + H2O () ⇌ H2 () + CO2 ()
Answer:
Hey Man I dont know the Answer Im really sorry
Explanation:
I took the test though
How many moles of oxygen will occupy a volume of 435 mL at 6780 torr and 28 °C?
Answer:
n = 0.157
Explanation:
To solve that question, we need to follow this equation: PV = nRT
V = 435ml (must be convert to L by ÷ by 1000) = 0.435 L
P = 6780 torr (must be convert to atm by ÷ by 760) = 8.92 atm
T = 28C (must convert to K by + 273.15) = 301.15 K
R = 0.08205
n = ?
PV = nRT
8.92 x 0.435 = n x 0.08205 x 301.15
3.88 = n x 24.7
Divided both sides by 24.7 (left n)
3.88/24.7 = n
0.157 = n
So 0.157 is the answer!
Which of the following are sources of chemical energy?
1. Batteries and food
2.Batteries and toasters
3. Fans and food
4. Food and toasters
The sources of chemical energy from the available options would be batteries and foods.
What is chemical energy?Chemical energy is a form of energy derived from the chemical properties of materials.
Most batteries contain chemicals that are able to ionize in solution to produce electric currents in circuits. Chemicals in batteries include sodium chloride, nitric acid, sulfuric acid, etc.
Foods contain chemicals that when hydrolyzed in the body, are able to produce energy to sustain the various processes in the body. The chemicals in foods are mostly carbohydrates.
More on chemical energy can be found here: https://brainly.com/question/1371184
A toothpaste contains sodium fluoride (NaF) What percentage of Fluoride is present.(4cs)
Answer:
45.2%
Explanation:
To calculate the percent of an element in a compound we divide the molar mass of the element by the compound and multiply that by 100
First lets find the molar mass of Fluoride
Looking at the periodic table Fluoride has a molecular mass of 18.998 g
Now we need to find the molecular mass of NaF
Looking at a periodic table, Sodium (Na) has a molecular mass of 22.990g and Fluoride has a molecular mass of 18.998 so NaF has a molecular mass of 22.990(1) + 18.998(1) = 41.988g
Now we divide the mass of fluoride by the mass of sodium fluoride and multiply that by 100 to find the percentage of fluoride that is present in NaF
Mass of Fluoride = 18.998g
Mass of Sodium Fluoride = 41.988g
Percentage of fluoride present in NaF = (18.998g / 41.988g) * 100 = 45.2%
What are the characteristics of a fibrous root system? (Select all that apply.)
made up of many roots
made up of one large root
made up of thin roots
made up of branched roots
Answer:branched roots and thin roots and many roots
What is another way to measure the average kinetic energy of a substance?
Answer:
Using temperature or a thermometer
Explanation:
Since AKE equals = temperature, you can find the temperature of a substance with a thermometer, which gives the temperature.
Answer:
Using a temperature scale
The mass of product that can be formed from reactant A is 45.6 g, and the mass of product that can be formed from reactant B is 33.2 g. Is reactant A or B the limiting reactant?
Answer:
Reactant B.
Explanation:
The mass of product that can be formed from reactant B is 33.2 is less than reactant A's (45.6).
Therefore, reactant B is the limiting reactant.
1. Destiny is working in the lab with a filter. She has a mixture of Aluminum Phosphate (AlPO4)
and water. She knows if she runs the mixture through her filter she will collect some solid
because
a. AIPO, is soluble in water
b. AIPO, is insoluble in water
c. AIPO, is attracted to the filter
d. Water is soluble in water
Why is this element considered
unreactive or inert?
P: 10
N: 10
Answer:
It is a noble gas.
Explanation:
The element in question is helium, a noble gas. It has a full shell of eight valence electrons like all the other noble gases, which means that it does not have to react with other elements in order to obtain a full octet of valence electrons. This means that it does not react with other elements.
Why is calcium in group 2A if the modern periodic table
how many molecules of water are there in 8.050 x 10^3 grams of water
Answer:This is approximately 2.69 * 10^26 molecules.
Explanation:
i just know
Using the formula M V1 = M2V2 , how many milliliters of a 2.50 M
hydrochloric acid solution is required to make 100.0 mL of a 0.750 M
solution?
1.88
333mL
300mL
30mL
Answer:30mL
Explanation:
If you add 2.50 with 0.750 divide that by 100 you would get 30.7 something without rounding it would be 30.
lab report solubility edge
Answer:
i'm attaching the report i made
Explanation:
(It does include the chart information)
hope this helps! have a wonderful day :)
The solubility of a solid solute increases with temperature.
What is the effect of temperature on the solubility of a solute?The solubility of a solute is the amount of solute that dissolves in a given volume of solvent at a particular temperature.
The solubility of a solute increases with increase in temperature.
Based on the lab results, it was seen that with increase in temperature, the mass of sugar that dissolves in water increases.
50 mL of water at 2 °C dissolved only 80 g of sugar whereas at 102 °C, 250 g of sugar dissolved.
Therefore, it can be concluded that solubility of a solute increases with temperature.
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2.a) when a bydrocarbon fuel is burnt, one of the main products is slightly acidic gas R Whats the name of gas R?
Answer:
Carbon and hydrogen atoms in the hydrocarbon fuel react with oxygen in an exothermic reaction. carbon dioxide and water are produced
Burning hydrogen is an example of a chemical reaction. The reaction is
shown in the diagram. Which of the following sthtements about energy in
this reaction is the most accurate?
Answer:
Energy is absorbed
Explanation:
since 1932 i learn this
The reaction below proceeds spontaneously at 298 K. NH3(g) Cl2(g)Right arrow. NH4Cl(s) What is the sign of the entropy change, Delta. S? Delta. S is negative because the product is less random than the reactants. Delta. S is negative because the reactants are less random than the product. Delta. S is positive because the product is less random than the reactants. Delta. S is positive because the reactants are less random than the product.
A spontaneous reaction favours the product formation and increases the entropy of the isolated system. The sign of the entropy change will be negative as the product formation is less random.
What is entropy?Entropy is the degree of the disorder or randomness that occurs in the system that lacks available energy and cannot convert the mechanical energy or work.
The entropy of the reaction will be negative as the reactants are present in the gaseous state and the product formed is solid. The product formation was spontaneous and less random.
Therefore, option a. entropy will be negative as product formation is less random.
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Hola Brainlians! I need your help in chemistry today
Question:-
Names and chemical formulas of all compounds formed by first 30 elements.
Note:-
In between these 30 elements ,there is carbon and hydrogen present who has infinite no of organic compounds .So just mentioning the common compounds
Here we go
Sodium chloride (NaCl)Lithium hydride(LiH)Methane(CH_4)Zinc sulphate (ZnSO_4)Ferus Ferric oxide(Fe_3O_4)Water(H_2O)Hydrochloric acid(H_2SO_4)Molybdenom oxide(Mo_2O_3)Cuprous oxide(Cu_2O)Potassium permanganate (KMnO_4)Potassium chloride (KCl)Magnesium oxide (MgO)Calcium hydroxide (Ca(OH)_2)Calcium oxide(CaO)Phosphorus pentachloride (PCl_5)Nitrous oxide (N_2O)Carbon dioxide (CO_2)Carbon monoxide (CO)Glucose(C_6H_12O_6)Baking soda(NaHCO_3)Deadline homework if someone could this I make u a brainlist. Thanks
A bicyclist decelerates with a force of -350 N. If the cyclist and bicycle have a total mass of 100 kg, what is the acceleration?
Which of the following is a measure of the randomness of a system?
O A. Heat
O B. Energy
O C. Efficiency
O D. Entropy
Answer to all these questions...
Answer:
A. Atomic number is 8, mass number of M is 16
B. Oxygen, O
C. 8 valence electrons, valency is 2
Explanation:
A. Atomic number = proton number
M2- = 2 extra electrons after forming octet structure, so 10-2=8
8 corresponds to number of protons, so atomic number is 8.
Mass number is number of protons + neutrons = 8+8=16
B. 8 in periodic table corresponds to oxygen
C. Number of valence electrons in an oxide ion is 8, valency is two as it forms -2 charge
List two products derived from ethylene
If you mix food dye with water, is that a physical change or chemical? (Cause my teacher said chemical)
Explanation:
well, I dunno if I'm correct but I think it's a physical change cause no new substance is formed
what is hydrogen
who likes Black pink Dancer
i like lalalisa
Answer:
did u fr ask what hydrogen is its a chemical element
Explanation:
a type of force where objects touch each other
Answer:
contact force
Explanation:
I have no idea why