Answer:
% Ca = 24.69%
% H = 1.2%
% C = 14.8%
% O = 59.25%
Explanation:
The percentage by mass of each element can be calculated by dividing the mass of each element in the compound by the molar mass of the compound.
Molar mass of Ca(HCO3)2
Where; (Ca= 40, H = 1, O = 16, C= 12)
= 40 + {1 + 12 + 16(3)}2
= 40 + {13 + 48}2
= 40 + {61}2
= 40 + 122
= 162g/mol
- % mass of Ca = 40/162 × 100
= 0.2469 × 100
= 24.69%
- % mass of H = 2/162 × 100
= 0.012 × 100
= 1.2%
- % mass of C = 24/162 × 100
= 0.148 × 100
= 14.8%
- % mass of O = 96/162 × 100
= 0.5925 × 100
= 59.25%
How can we find life on other planets?
Through satellites...
Which of the following statements are true?
Question 1 options:
According to collision theory, any factor that can cause more collisions will increase the rate of reactions.
According to collision theory, factors can cause more collisions, but will not change the rate of reactions.
According to collision theory, factors that can cause more collisions have less energies than the activation energy, thus will decrease the rate of reaction.
According to the collision theory, no factors can influence reaction rates.
Answer:
c
Explanation:
factor can cause more collision and increase the rate of reaction
Please Answer Giving Brainleist
What gas in the air is used by plants to make their own food?
A) Nitrogen
B) Water vapor
C) Carbon dioxide
D) Oxygen
Answer:
C) Carbon dioxide is the answer.
Answer:
C. Carbon Dioxide
Carbon is absorbed by plants and chemically converted to oxygen via photosynthsis.
Hope this helps!
How many moles are there in 8.0 grams of CaCO3
Answer: moles = 0.0799305403604264
Explanation:
Consider 4.70 L of a gas at 365 mmHg and 20. ∘C . If the container is compressed to 2.00 L and the temperature is increased to 36 ∘C , what is the new pressure, P2, inside the container? Assume no change in the amount of gas inside the cylinder.
Answer:
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Explanation:
explain the effect of the coil of wire after it has been charged by the batteries
An electric range burner weighing 699.0 grams is turned off after reaching a temperature of 482.0°C, and is allowed to cool down to 22.7°C.
Calculate the specific heat of the burner if all the heat evolved from the burner is used to heat 560.0 grams of water from 22.7°C to 80.3°C.
J/g°C
Answer:
0.42 J/gºC
Explanation:
We'll begin by calculating the heat energy used to heat up the water. This can be obtained as follow:
Mass (M) of water = 560 g
Initial temperature (T₁) = 22.7 °C
Final temperature (T₂) = 80.3 °C.
Specific heat capacity (C) of water = 4.18 J/gºC
Heat (Q) absorbed =?
Q = MC(T₂ – T₁)
Q = 560 × 4.18 (80.3 – 22.7)
Q = 2340.8 × 57.6
Q = 134830.08 J
Finally, we shall determine the specific heat capacity of the burner. This can be obtained as follow:
Mass (M) of burner = 699 g
Initial temperature (T₁) = 482.0°C
Final temperature (T₂) = 22.7 °C
Heat (Q) evolved = – 134830.08 J
Specific heat capacity (C) of the burner =?
Q = MC(T₂ – T₁)
–134830.08 = 699 × C (22.7 – 482.0)
–134830.08 = 699 × C × –459.3
–134830.08 = –321050.7 × C
Divide both side by –321050.7
C = –134830.08 / –321050.7
C = 0.42 J/gºC
Therefore, the specific heat capacity of the burner is 0.42 J/gºC
A 16.4 g sample of calcium chloride is dissolved in enough water to make 750.0 mL of solution. Calculate the molarity of calcium chloride in this solution. plz help!!!
The molarity is an important method to calculate the concentration of a solution. The molarity of calcium chloride of 16.4 g in 750.0 mL of solution is 0.196 mol L⁻¹.
What is molarity?The molarity of a solution is defined as the number of moles of the solute present per litre of the solution. It is mainly employed in calculating the molarity of a binary solution. It is represented as 'M' and unit is mol L⁻¹.
The equation used to calculate the molarity is given as:
Molarity = Number of moles of the solute / Volume of the solution in litres
Molar mass of CaCl₂ = 110.98 g/mol
Given mass = 16.4 g
Number of moles = 16.4 / 110.98 = 0.147
750.0 mL = 0.75 L
Molarity = 0.147 / 0.75 = 0.196 mol L⁻¹
Thus the molarity is 0.196 mol L⁻¹.
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During a lab experiment performed at STP conditions, you prepare HCl by reacting 100. ml of Cl2 gas with an excess of H2 gas.
How many ml of a solution of Ba(OH)2 0.230M do you need to neutralize all the HCl produced?
Answer:
19.4 mL Ba(OH)2
Explanation:
H2(g) + Cl2(g) --> 2HCl(aq) (make sure this equation is balanced first)
At STP, 1 mol gas = 22.4 L gas. Use this conversion factor to convert the 100. mL of Cl2 to moles.
0.100 L Cl2 • (1 mol / 22.4 L) = 0.00446 mol Cl2
Use the mole ratio of 2 mol HCl for every 1 mol Cl2 to find moles of HCl produced.
0.00446 mol Cl2 • (2 mol HCl / 1 mol Cl2) = 0.00892 mol HCl
HCl is a strong acid and Ba(OH)2 is a strong base so both will completely ionize to release H+ and OH- respectively. You need 0.00892 mol OH- to neutralize all of the HCl. Note that one mole of Ba(OH)2 contains 2 moles of OH-.
0.00892 mol OH- • (1 mol Ba(OH)2 / 2 mol OH-) • (1 L Ba(OH)2 / 0.230 M Ba(OH)2) = 0.0194 L = 19.4 mL Ba(OH)2
The first step in answering this reaction is to write down the required reaction equations and then answer the questions from stoichiometry(mass-mole relationship).
The first equation is;
[tex]H2(g) + Cl2(g) ------->2HCl(g)[/tex]
The second equation is
[tex]2HCl(g) + Ba(OH)2(aq) -------> BaCl2(aq) + 2H2O(l)[/tex]
From stoichiometry;
1ml = 1cm3
Since hydrogen is in excess, chlorine is the limiting reactant
1 mole of Cl2 occupies 22400cm3
x moles of Cl2 occupies 100cm3
x = 1 * 100/22400
x = 0.00446 moles of Cl2
According to the reaction equation;
1 mole of Cl2 yields 2 moles of HCl
0.00446 moles of Cl2 yields 0.00446 * 2/1
= 0.00892 moles of HCl
From the reaction equation;
2 moles of HCl reacts with 1 mole of Ba(OH)2
0.00892 moles of HCl reacts with 0.00892 * 1/2 = 0.00446 moles of Ba(OH)2
Since 0.00446 moles of Ba(OH)2 reacted
number of moles = concentration * volume
number of moles = 0.00446 moles
concentration = 0.230M
Let the volume in ml be V
0.00446 = 0.230 * V/1000
V = 0.00446 * 1000/ 0.230
V = 19.39 ml
Volume in ml = 19.39 ml of Ba(OH)2
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Physical chemistry is the bridge between physics and chemistry.
a. True
b. False
Answer:
Im gonna go with.... B. False
________________________________
*rate this answer and say thanks please!
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Yes it is true. That physical chemistry is a bridge between physics and chemistry. Because here we study the physical behaviours of the chemical reactions.
How many atoms are in a ring made of pure gold, Au (element 79), if there are 0.092 moles of gold in it?
Answer:
i think it wil be 567489
Explanation:
ik im right :)
help out here plzzzzzzzzzzzzz
Answer:
Chromosomes are duplicated in the "s phase" of interphase.
what is the electron configuration of S and Cl?
Answer:
S is [Ne] 3s²3p⁴
Cl is [Ne] 3s² 3p⁵
Explanation:
Study the diagram of the two animals.
Which statement best describes the animals?
Animal X begins life as a tadpole, and animal Y begins life as a larva that looks like the adult.
Animal X begins life as a larva that looks like the adult, and animal Y begins life as a tadpole.
Both animal X and animal Y begin life as a tadpole and change form as they develop.
Both animal X and animal Y begin life as a larva that looks like the adult.
Both animal X and animal Y begin life as a tadpole and change form as they develop
Answer:
it is c, for those who want an answer fast
Explanation:
Bonds are formed because atoms are more stable when they have the valence shell in the electron noble gas configuration (full outer valence shell). What is the net charge of either molecular
ionic compounds?
o
А
Positive
B
Negative
O &
D
Zero-neutral
does anyone know the answer???
Answer:
ethyl ethernal
Explanation:
no explanation
Question 7
3 pt:
N2 + 312 --> 2N13
If 81.3 grams of lodine is reacted with 4.49 grams of nitrogen what is the theoretical yield?
(Include the correct number of significant figures but no units)
Question 8
Answer:
84.3 g of nitrogen triiodide is the theoretical yield.
Explanation:
Hello there!
In this case, according to the chemical reaction:
[tex]N_2 + 3I_2 \rightarrow 2NI_3[/tex]
It is possible to compute the theoretical yield of nitrogen triiodide by each reactant via stoichiometry as shown below:
[tex]m_{NI_3}^{by\ N_2}=4.49gN_2*\frac{1molN_2}{28.01gN_2} *\frac{2molNI_3}{1molN_2}*\frac{394.72gNI_3}{1molNI_3} =126.55gNI_3\\\\m_{NI_3}^{by\ I_2}=81.3gI_2*\frac{1molI_2}{253.81gI_2} *\frac{2molNI_3}{3molI_2}*\frac{394.72gNI_3}{1molNI_3} =84.29gNI_3[/tex]
Therefore, we infer that the smallest amount is the correct theoretical yield as it comes from the limiting reactant, in this case, diatomic iodine as it yields 84.3 g (three significant figures) of nitrogen triiodide as the theoretical yield; incidentally, nitrogen acts as the excess reactant.
Best regards!
Please please help me please please
Answer: 1. A, 2.B, 3. D, 4. B, 5. C
Explanation:
i have P.E. too lol have a great day!
Which statement can be made about the above passage
Answer:
Explanation:
whats the qustion?
Structure of benzylidene diacetate....
Explanation:
Benzal .....
Molecular Formula: C11H12O4
CH4 Structural formulas
Explanation:
Methane = CH4(formula)
One of the methods that scientists can use to determine the toxicity of a chemical compound is to perform a dose-response analysis.
a. True
b. False
Answer:
a. True
Explanation:
Hello there!
In this case, since the dose-response method is crucial concept in toxicology as it exhibits the result of exposures to toxic chemical compounds with changes in body functions or health, this statement is a. True , as this analysis is understood by means of the relationship -the higher the dose, the more severe the response-, and of course, it is based on observed data from controlled experiments in animal, human clinical, or cell studies, in the light of the determination of the toxicity of the analyzed chemical.
Regards!
what is the pH level of soda?
the exact position of the electrons of an atom cannot be determined because they are in constant ___
The models show the phases of a substance at various temperatures. Which model BEST communicates the kinetic energy and particle arrangement of a liquid? A. Model D, because it has high kinetic energy so the particles in the model have ionized B. Model B, because it has some kinetic energy and the particles have a free flowing shape C. Model C, because it has high kinetic energy so the particles in the model have no definite shape D. Model A, because it has some kinetic energy and the particles move freely
Answer: Model B. I have included a graph for this question. Model D is incorrect because that is a model for plasma as liquid doesn't contain ionized particles. Model C is incorrect as that represents a solid. Model A is incorrect because that is showing a gas; the particles are moving very freely
According to the forces of attraction, model B communicates the kinetic energy and particle arrangement of a liquid.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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Your question is incomplete but most probably your full question was, The models show the phases of a substance at various temperatures. Which model BEST communicates the kinetic energy and particle arrangement of a liquid? A. Model D, because it has high kinetic energy so the particles in the model have ionized B. Model B, because it has some kinetic energy and the particles have a free flowing shape C. Model C, because it has high kinetic energy so the particles in the model have no definite shape D. Model A, because it has some kinetic energy and the particles move freely
What is the molarity of a solution made by dissolving 5 mol of H3PO4 in 0.05 L of solution?
Need Fast!
Answer:
"100" is the molarity of solution.
Explanation:
The given values are:
Moles of solute,
= 5 mol
Liters of solution,
= 0.05 L
Now,
The molarity of a solution will be:
= [tex]\frac{Moles \ of \ solute}{Liters \ of \ solution}[/tex]
On substituting the values, we get
= [tex]\frac{5}{0.05}[/tex]
= [tex]100[/tex]
what is the molar mass of aspartic acid
The molar mass of aspartic acid is 133.05g/mol.
What is molar mass?The molar mass is the mass per unit amount of substance of a given chemical entity. It is denoted by a symbol M. The SI unit of molar mass is kg/mol.
What is aspartic acid?Aspartic acid is one of the building-block of amino acids which is responsible for synthesizing proteins and regulating hormones in the human body.
The chemical formula of aspartic acid is C4H7NO4.
Atomic mass of C = 12.011u, H = 1.007u, N = 14.006u, O = 16u
Molar mass of C4H7NO4 = 4(12.011)+7(1)+14.006+4(16)
= 48.044+7+14.006+64
= 133.05g/mol
Hence, the molar mass of aspartic acid is 133.05g/mol.
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What resists pH change by reacting with acids and bases?
Joseph rides his bike for 30 miles in one hour
going west . Is it speed velocity or acceleration
Answer:
velocity
Explanation:
because he is going 30 miles west
Who kept scientific experiments from being performed in the middle
ages?
A. The Government
B. The Judicial System
C. The Board of Science
D. The Church
Answer:
D. The Church
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