Answer:
Percent yield = 7.1%
Explanation:
The general reaction of the problem is:
Ca(OH)₂ + CO₂ → H₂O + CaCO₃
To solve this question we need to find theoretical yield using the amount of carbon dioxide added because:
Percent yield = Actual yield (3.22g) / Theoretical yield * 100
Theoretical yield is the maximum amount of product that could be obtained. To find it we need to convert the mass of CO₂ to moles. The moles of CO₂ = Moles of CaCO₃:
Moles CO₂ -Molar mass: 44.01g/mol):
20.0g * (1mol / 44.01g) = 0.454 moles CO₂ = Moles of CaCO₃ produced
Mass CaCO₃ = Theoretical yield -Molar mass: 100.09g/mol-:
0.454 moles * (100.09g / mol) = 45.5g of CaCO₃ = Theoretical yield.
Replacing:
Percent yield = 3.22g / 45.5g * 100
Percent yield = 7.1%I’ll really appreciate it if you help me out on this one .
need the names for these asap please
Answer:
3_ethylpentane
4_ethylheptane
1_pentene
3_hexene
Using the equation below, calculate the percent yield of H3PO4 if an experiment that started with 12.98 grams of HCl and excess Na3PO4 yielded 8.42 g of H3PO4. Please round to the nearest 0.01 and remember units and substance.
Na3PO4 + HCl --> NaCl + H3PO4
True or false Compounds link up to make elements
Answer:
false
compound are formed from elements .
What is the meaning of the word neutral?
Explanation:
having no strongly marked or positive characteristics or features.
Humans become part of the carbon cycle when they
A. breathe in carbon dioxide,
B. release carbon as a waste product,
C. produce new carbon compounds in their cells,
Answer:
Human activities have a tremendous impact on the carbon cycle
Explanation:
Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere. ... The ocean absorbs much of the carbon dioxide that is released from burning fossil fuels.
How many moles of gas are contained in 890.0 mL at 21.0 at C degrees and 750.0 mm Hg pressure?
Answer:
There are 0.0364⋅mol
Explanation:
Solid potassium chloride is obtained by the reaction of solid potassium and chlorine gas.
Write a balanced chemical equation for this reaction.
Answer:
2 K(s) + Cl₂ (g) --> 2 KCl(s)
Explanation:
Potassium will just be K
Chlorine gas is part of BrIClHOF, which are diatomic gasses. So Cl₂
Looking at the periodic table potassium K has an ion charge of +1 and chlorine Cl has an ion charge of -1, so in a balanced compound they will be written as KCl
Balancing the amounts of each will lead to 2 K(s) + Cl₂ (g) --> 2 KCl(s)
Use the diagram below to answer the question.
An Energy Relationship in an Ecosystem
grass
mouse
Which statement best describes the energy relationship shown between the organisms?
Both produce their own energy.
b Only the mice need energy to survive.
They compete for the same source of energy.
Energy flows from the producer to the consumer.
Answer:Where is the diagram
Explanation:
what are the chemical properties of acids
Answer:
Acids are sour in taste. Acids react with carbonates and hydrogen carbonates to form a salt, water, and carbon dioxide gas. Extremely active metals such as Potassium (K), Calcium (Ca), Sodium (Na), etc tend to explode when combined with acids. Weak Acids like Carbonic Acid doesn't act with any metal at all.
I copied and pasted
but I hope the info helps
Air with less than 19.5% oxygen cannot support human life. How many moles of oxygen would the caisson if the percent of oxygen in the air dropped to 19.4%.
It takes 5.54 mL of a 2.18 M NaOH solution to neutralize 6.19 mL of an HCl solution. What is the concentration of the HCl solution? Do not include units in your
answer. Round to the tenths place or further.
Answer:
2 M
Explanation:
NaOH + HCl --> NaCl + H2O,
5.54 mL = .00545 L,
If we consider 2.18 M, M [molarity] = mol/L, so we have 2.18 mol/L. From this we can get the moles of NaOH.
.00545 L * 2.18 mol/L ≈ .0121 mol
The concentration of HCl can be found from the following:
.0121 mol = .00619(x) [where x = concentration of HCl]
x = 1.955 M ≈ 2 M
We equate the two as we require the same amount in order to neutralize the base.
How much sugar can be dissolved of the 0.3 ml of water is heated to 1000C?
Please help me with this question tyy
Oh sheesh girl.. this is tricky.. but I can try:)
Between the chemical reaction of the chemicals and the label on the bottle the ions from in the radioactive product contained in the bottle separates the label from the surface. Im guessing that due to the "radioactive waste" in the bottle that there are components of thermal heat, that may also have an effect on the "label". So when talking about the reaction we have a chemical and thermal reaction happening.
I tried... and im sorry if it dosen't make sense... +_=||
have a wonderful day :)
HELP! WILL MARK BRAINLYEST!!
The following formula d/t is used for calculation what?
The formula is used for calculating speed. D stands for distance, T stands for time. Full formula is S=D/T
Help please I will give brainliest with 1
Kitchen Math: Measuring
1. By understanding how to measure ingredients, time and temperature,
you take the guesswork out of cooking.
2. The two scales for temperature are Fahrenheit and Celsuis.
3. The three times to wash when cooking are: A. before cooking
B. during cooking
C. after handling of food
4. The three kinds of measurement are
A. estimated
B. ratio
C. calibrated measurement
5. Estimated measurement is great for foods such as soup.
6. Ratio cooking compares the amount of one ingredient to another
ingredient.
7. The most common kind of kitchen measurement in America is the English system.
8. One quart is almost a liter.
9. The metric system is based on tens.
Kitchen Math 3
Learning ZoneXpress 888-455-7003 • www.learmingzonexpress.com
10. Measuring tools you find in almost every kitchen are timers, thermometers and measuring containers.
11. Water freezes at 32 Fahrenheit and 0° Celsius. Water boils at 212" Fahrenheit and 100° Celsius.
12. When measuring dry ingredients, you want to dip, scoop and scrape.
13. If your recipe calls for sifted flour, sift it before you measure.
14. Brown sugar, cooked rice and chopped parsley need to be packed down in measuring cups
15. When measuring liquids, get down at eye level.
16. Measuring spoons are used for both liquid and dry ingredients.
17. Use the back of a knife to scrape off dry ingredients when using a measuring spoon,
18. Taring is when you allow for the weight of a container or wrapper.
19. Dry ingredients do not weigh the same as wet ingredients.
20. A large egg weighs about 2 ounces.
21. Turn pancakes when you see bubbles on the top.
do all energy transfers lead to a phase change
Answer: Fusion, vaporization, and sublimation are endothermic processes, whereas freezing, condensation, and deposition are exothermic processes. Changes of state are examples of phase changes, or phase transitions. All phase changes are accompanied by changes in the energy of a system
Explanation:
how many liters are in 4x10^23 atoms of CO
Answer:
3.346*10^25
Explanation:
Hope this helps
Write the equilibrium expressions for each of the following equilibria:
a. 2 Ba + O2 ⇌ 2 BaO
b. 2 Mg + O2 ⇌ 2MgO
c. P4 + 5 O2 ⇌ P4O10
Answer:
a.
[tex]K=\frac{[BaO]^2}{[Ba]^2[O_2]}[/tex]
b.
[tex]K=\frac{[MgO]^2}{[Mg]^2[O_2]}[/tex]
c.
[tex]K=\frac{[P_4O_{10}]^2}{[P_4][O_2]^5}[/tex]
Explanation:
Hello!
In this case, since the equilibrium expression is set up by dividing the products over the reactants and powering to the stoichiometric coefficient, we can proceed as follows:
a. 2 Ba + O2 ⇌ 2 BaO.
[tex]K=\frac{[BaO]^2}{[Ba]^2[O_2]}[/tex]
b. 2 Mg + O2 ⇌ 2MgO
[tex]K=\frac{[MgO]^2}{[Mg]^2[O_2]}[/tex]
c. P4 + 5 O2 ⇌ P4O10
[tex]K=\frac{[P_4O_{10}]^2}{[P_4][O_2]^5}[/tex]
Best regards.
1. What two types of cells contain chloroplasts?
Answer:
plant cells and eukroyatic algae
What is the chemical formula for Magnesium and Phosphorus as a compound?
1- Mg2 P5
2- Mg2 P3
3- Mg3 P2
4- Mg5 P3
The answer is Mg3 glad I helped
PLS HELP URGENT
Electron dot diagrams
Use your periodic table to write the electron dot diagrams for the following atoms.
1. Calcium (Ca)
2. Polonium (Po)
3. Moscovium (Mc)
4. Boron (B)
5. Fluorine (F)
In an experiment, students were instructed to equally heat a sample of soil and a sample of water with heat lamps and then measure the temperature of each sample every minute for five minutes. The results are shown in the table.Which of the following predictions is BEST supported by the data?
Answer:
Explanation:
D. i had this on my science test!!!
Answer:
D
Explanation:
yup its D
How many grams of hydrogen reacts with 32 g of oxygen to produce 34 g of hydrogen peroxide
Answer:
2 grams.
Explanation:
H2 + O2 ---> H2O2
Using molar masses:
2*1 g hydrogen reacts with 2*16 g oxygen.
so 2g H2 reacts with 32 g O2.
1. Define action energy.
Answer:
In physics, action is an attribute of the dynamics of a physical system from which the equations of motion of the system can be derived through the principle of stationary action. ... Action has dimensions of energy⋅time or momentum⋅length, and its SI unit is joule-second.
Explanation:
hope it helps
Answer:
Action is an attribute of the dynamics of a physical system from which the equations of motion of the system can be derived through the principle of stationary action.
Explanation:
Study the chemical reaction below and answer the questions that follow: 8Al + 3Fe₃O₄ → 4Al₂O₃ + 9Fe How many moles of iron would be produced if 4.0 moles of aluminum reacts with an excess of Fe₃O₄?
A. 4.0 moles
B. 4.5 moles
C. 8.0 moles
D. 9.0 moles
Answer: the answewr is A. hope this helps!
Explanation:
What is the % of each element in (NH4)2(SO4)?
Nitrogen=21.1999%
Hydrogen=6.1023%
Sulfur=24.2660%
The percent composition of nitrogen, hydrogen, sulfur , oxygen in ammonium sulfate is 21.18%, 6.05%,24.21%,48.43% respectively.
What is percent composition?The percent composition is defined as a convenient way to record concentration of solution.It is a expression which relates solute to solvent as,mass of solute/mass of solution ×100.It helps in elemental analysis of a given compound by giving proportions in which they are present.
Percent composition of N= 28/132.14×100=21.18%
Percent composition of H=8/132.14×100=6.05%
Percent composition of S=32/132.14×100=24.21%
Percent composition of O=64/132.14×100=48.43%.
Thus, the percent composition of nitrogen, hydrogen, sulfur , oxygen in ammonium sulfate is 21.18%, 6.05%,24.21%,48.43% respectively.
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convert 0.881 mol N2 at STP to volume in liters
Answer:
19.7 L N2
Explanation:
The volume of the nitrogen gas at STP is equal to 19.72 L.
What is the ideal gas equation?The ideal gas equation can be defined as an equation that describes the behavior of an ideal gas. This equation gives by the product of the volume and pressure is equal to the product of the moles of gas, gas constant, and absolute temperature.
The mathematical form of the ideal gas law is given as follows:
PV = nRT
Where n is the moles, V is the volume, R is the universal gas constant and P is the pressure.
The temperature of the N₂ , T = 0° C = 273 K
The pressure of the gas at STP, P = 1 atm
The value of the universal gas constant, R = 0.082 atm L/K mol
The number of moles of N₂, n = 0.881 mol
Fill in the values n, R, P, and T in the equation, and we get:
1 × V = 0.881 × 0.082 × 273
V = 19.72 L
Learn more about ideal gas equation, here:
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How does natural gas impact the environment
I REALLY NEED THIS SOON!!!!!!!
Answer: Burning natural gas for energy results in fewer emissions of nearly all types of air pollutants and carbon dioxide (CO2) than burning coal or petroleum products to produce an equal amount of energy.
Explanation:
Answer:
Natural gas is a relatively clean burning fossil fuel . Burning natural gas for energy results in fewer emissions of nearly all types of air pollutants and carbon dioxide than burning coal or petroleum products to produce an equal amount of energy.
Explanation:
Someone please help me with this I dont know if this is correct
Answer:
Yes its correct
Explanation:
Protons + Nuetrons
Answer: Go with your gut cos
Explanation: