Answer:
Explanation:
I can help
Answer:
12.67g of Mg / 15.33g of MgO * 100% = 82.6% of Mg
Explanation:
A solution is a mixture where one substance is dissolved in another. One example of a solution is salt water. Why does salt water appear to be a single substance even though it contains more than one substance? A. Each component in salt water retains its original physical properties. B. The components in salt water cannot be separated from each other. C. The particles in salt water are spread throughout. D. Salt water is a solution and also a pure substance.
Answer: C. The particles in salt water are spread throughout.
Explanation:
Homogeneous mixtures: It is a mixture that has uniform composition throughout the solution and the particle size or shapes are not different. There is no physical boundary between the dispersed phase and dispersion medium. Example: Salt dissolved in water.
Heterogeneous mixtures: It is a mixture that has non-uniform composition throughout the solution and the particle size or shapes are also different. There is a physical boundary between the dispersed phase and dispersion medium. Example: sand in water.
Answer:
Its c
Explanation:
A solution is a mixture where one substance is dissolved in another. One example of a solution is salt water. Why does salt water appear to be a single substance even though it contains more than one substance. Got it right in school city
Will mark the brainiest later for correct answers! Please show work.
Mass C12H22O11 = 14.08g
Convert grams to moles:
Convert grams to molecules:
Mass NaCI: 17.75g
Convert grams to molecules:
Convert grams to formula units:
Copper (II) Sulfate Pentahydrate
Chemical Formula: CuSO4.5H2O
Mass: 20.06g
Convert grams to moles:
Formula Units:
Answer:
According to avogadro's law, 1 mole of every substance contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles and weighs equal to its molecular mass.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
[tex]\text{Number of moles}=\frac{\text{Given molecules}}{\text {Avogadros number}}[/tex]
a. moles in 14.08 g of [tex]C_{12}H_{22}O_{11}[/tex] = [tex]\frac{14.08g}{342.3g/mol}=0.04113moles[/tex]
molecules in 14.08 g of [tex]C_{12}H_{22}O_{11}[/tex] = [tex]0.04113\times 6.023\times 10^{23}=0.2477\times 10^{23}[/tex]
b. moles in 17.75 g of NaCl = [tex]\frac{17.75g}{58.5g/mol}=0.3034moles[/tex]
molecules in 17.75 g of [tex]NaCl[/tex] = [tex]0.3034\times 6.023\times 10^{23}=1.827\times 10^{23}[/tex]
formula units 17.75 g of [tex]NaCl[/tex] = [tex]0.3034\times 6.023\times 10^{23}=1.827\times 10^{23}[/tex]
c. moles in 20.06 g of [tex]CuSO_4.5H_2O[/tex]= [tex]\frac{20.06g}{249.68g/mol}=0.08034moles[/tex]
formula units in 20.06 g of [tex]CuSO_4.5H_2O[/tex]= [tex]0.08034\times 6.023\times 10^{23}=0.4839\times 10^{23}[/tex]
a sample of carbon dioxide gas at a pressure of 1.10 atm and a temperature of 20.6 occupies a volume of 19.2 L. If the gas is allowed to expand at constant temperature to a volume of 24.3 L, the pressure of the gas sample will be ________ atm
Answer:
0.87atm
Explanation:
Given parameters:
Pressure of the gas = 1.1atm
Initial temperature = 20.6°C = 20.6 + 273 = 293.6K
Initial volume = 19.2L
New volume = 24.3L
Unknown:
New pressure = ?
Solution:
To solve this problem, we apply the Boyle's law equation:
P1V1 = P2V2
P and V are pressure and volume
1 and 2 are the initial and new states
1.1 x 19.2 = P2 x 24.3
P2 = 0.87atm
The discovery of protons and electrons most directly refuted or replaced the idea that
a. atoms contain a nucleus
b. the atom resembles plum pudding
c. the atom is electrically neutral
d. the atom is indivisible
Which bond is most polar?
ОА СО
ов So
Осно
ODNO
Answer:
either first or second if not them try d but I'm pretty sure a also I'm sorry if I getbyou this wrong I dearly apologize
If we react 5.4g of sodium chloride with an unknown amount of fluorine gas, we produce 4.9g of sodium fluoride and 3.7g chlorine gas. How much fluorine was consumed in the reaction?
Answer:
1.9g of F₂ were consumed in the reaction
Explanation:
Based on the chemical reaction:
2NaCl + F₂ → 2 NaF + Cl₂
Where 2 moles of NaCl react per mole of F₂ to produce 2 moles of NaF and 1 mole of Cl₂
To understand in a better way how the reaction occurs we need to convert each mass of compound to moles:
Moles of NaCl -Molar mass: 58.44g/mol-:
5.4g * (1mol / 58.44g) = 0.092 moles NaCl
Moles of NaF -Molar mass: 41.988g/mol-:
4.9g * (1mol / 41.998g) = 0.12 moles NaF
Moles of Cl₂ -Molar mass: 70.90g/mol-:
3.7g * (1mol / 70.90g) = 0.052 moles Cl₂
That means approximately 0.1 moles of NaCl react with 0.05 moles of F₂ to produce 0.1moles of NaF and 0.05 moles of Cl₂.
0.05 moles of F₂ are:
0.05 moles * (38g/mol) =
1.9g of F₂ were consumed in the reactionHow do you calculate the percent composition of an element in a compound
Answer:
Percent composition is calculated from a molecular formula by dividing the mass of a single element in one mole of a compound by the mass of one mole of the entire compound. This value is presented as a percentage.
Explanation:
why water is not used as a thermometric substance
Answer:
Water can be used as the thermometric liquid. It expands and contracts with temperature so it can be used. It's just not a very good choice because: It's thermal expansion is not very large compared to other liquids like mercury.
Explanation:
Hope this help
this is just to make sure but plz help
How many grams of water are produced from the decomposition of 63 grams of lithium hydroxide
(LiOH)?
Answer:
18.65004 grams H2O
Explanation:
First, we need to write down the balanced chemical equation for the decomposition reaction:
2LiOH -> H2O + Li2O
Since we have grams of LiOH and we need to know the grams of water, we need to convert to moles since we can only compare moles to moles.
The amu of LiOH is 23.947.
The given grams of LiOH is 63.. To convert to moles, we will divide 63 by 23.947..
This gives us 2.6310 moles LiOH..
To convert to moles of H2O (and later grams of H2O), we will use the mole fractions from the balanced equation...
When we look at the balanced equation we can see that 2 moles of LIOH can produce 1 mol of Water, so:
2.6310 moles [tex]* \frac{1 molH_{2}O}{2 mol LiOH}[/tex] = 1.3155 moles H2O
Now we will convert from moles to grams (we must multiply by the amu)
1.3155 moles H2O = 18.65 grams H2O
According to stoichiometry of the chemical equation of decomposition of lithium hydroxide 23.6 g of water are produced from the decomposition of 63 grams of lithium hydroxide.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is useful in balancing chemical equations.
In the given example, as 47.9 g of lithium hydroxide produces 18 g water ,therefore 63 of lithium hydroxide will produce 63×18/47.9=23.6 g of water.
Thus, 23.6 g of water are produced from the decomposition of 63 grams of lithium hydroxide.
Learn more about stoichiometry,here:
https://brainly.com/question/9743981
#SPJ2
NEED ANSWER ASAP HELP!!!!
Answer:
1. 4 Km
2. 40 minutes
3. 0.1 Km/min
Explanation:
1. Determination of the total distance travelled.
From the graph given in the question above, we can see that the total distance travelled by the object is 4 Km since the path taken by the object in the graph ends at the 4 km mark.
2. Determination of the Time taken.
A careful observation of the graph given in the question shows that the entire trip took 40 minutes since the distance travelled by the object ends at the 40 minutes mark on the graph.
3. Determination of the average speed of the object.
Total distance = 4 Km
Total time = 40 mins
Average speed =..?
Average speed = Total distance / total time
Average speed = 4 / 40
Average speed = 0.1 Km/min
give reason unit of volume is a derived unit
Answer:
A derived unit is defined as the unit that is created from a product of SI base units. Volume is an example of derived unit because it is not possible to measure volume directly using any measuring device For eg., Volume of water in bucket is can not be measured using rule, or scale, or any other measuring device.
Hence, volume is a derived unit.
How many atoms are in a molecule of RSq?
How many moles are in 43.5 g of sodium hydroxide (NaOH)?
Answer:
1.09 moles of NaOH
Explanation:
First of all, to calculate moles, you need to find the molar mass of NaOH.
Let us first find the molar mass of NaOH then.
Na = 23.0 amu
O = 16.0
H = 1.0
They are 1 nitrogen atom, 1 oxygen atom, and one hydrogen atom.
So do this.
23.0(1) + 16.0(1) + 1.0(1) = 40 g/mol.
Now use dimensional analysis to show your work
43.5 g of NaOH * 1 mol of NaOH / 40 g/mol of NaOH
The grams cancel out.
43.5 / 40.0 = 1.0875
Use sig figs and round the answer to the nearest hundredths place.
1.0875 = 1.09
So the final answer is 1.09 moles of NaOH
Hope it helped!
4.0 moles of H2O would have what mass?
Group of answer choices
18 g
23 g
68 g
72 g
Answer:
How many moles H2O in 1 grams? The answer is 0.055508435061792.
We assume you are converting between moles H2O and gram.
You can view more details on each measurement unit:
molecular weight of H2O or grams
This compound is also known as Water or Dihydrogen Monoxide.
The SI base unit for amount of substance is the mole.
1 mole is equal to 1 moles H2O, or 18.01528 grams.
Explanation:
The mass of 4.0 moles of water is 72 grams.
Explanation:
Moles of the substance is equal to the ratio of the mass of substance to the molar mass of the substance:[tex]Moles=\frac{\text{mass of substance}}{\text{molar mass of substance}}[/tex]
Given:
The 4.0 moles of water
To find:
Mass of moles of water
Solution:
The moles of water = 4.0 moles
The mass of water = M
The molar mass of water = 18.01528 g/mol
[tex]4.0=\frac{m}{ 18.01528 g/mol}\\m=4.0\times 18.01528 g/mol\\=72.06112 g\approx 72 g[/tex]
The mass of 4.0 moles of water is 72 grams.
Learn more about moles of substance here:
brainly.com/question/2293005?referrer=searchResults
brainly.com/question/4160077?referrer=searchResults
In an ionic compound, the negative and positive ions are held together by __________.
Answer:
the third one
Explanation:
El salmón percibe la presencia del 2-feniletanol (C5H5-CH2-CH2-OH) en el agua, en cantidades tan bajas como 0.03 mole en cien trillones (1*10^18) de litros de agua, ¿cuál es la masa, en gramos, de esa sustancia? ¿Qué cantidad de moléculas equivale a esa sustancia?
Answer:
3.66 g de 2-feniletanol (C5H5-CH2-CH2-OH)
1.8 * 10 ^ 22 moléculas
Explanation:
Sabemos que podemos obtener la masa de una sustancia a partir del número de moles presentes de la siguiente manera;
número de moles = masa / masa molar
masa molar de 2-feniletanol (C5H5-CH2-CH2-OH) = 122,16 g / mol
masa = 0.03 moles * 122.16 g / mol = 3.66 g de 2-feniletanol (C5H5-CH2-CH2-OH)
Si 1 mol = 6.02 * 10 ^ 23 moléculas
0.03 moles = 0.03 moles * 6.02 * 10 ^ 23 moléculas = 1.8 * 10 ^ 22 moléculas
What can you determine about an element if you only know its group number on the periodic table?
A. The total number of protons and neutrons
B. The number of protons
C. The total number of electrons
D. The number of valance elctrons
Answer:
c
Explanation:
Heat is transferred in all but which way.
Select one:
a. convection
b. sublimation
c. conduction
d. radiation
Btw I know it’s science but chem was closest thing to that
What happened when you placed your bottle system
in cold water?
Answer:
The water level in the pipe went down.] ... [The hot water in the cup heated up the water particles inside the bottle. They began to move more. Greater motion (kinetic energy) pushed the particles farther apart, resulting in expansion.
Sex cells are produced by the process of mitosis.
True
False
Answer:
True is the Answer.
Explanation:
True.
The element oxygen, represented by the symbol O, is classified as
A. a compound.
В. a mixture.
C. a solution.
D. a pure substance.
Please help soon! :))
Describe four ways by which organisms reproduce asexually
Answer: thay can't make cells
Explanation:
How many moles of carbon dioxide (CO2) does 250 grams of the substance have? How many
molecules of CO2 are there? The molar mass of CO2 is 44.01 g/mol.
Explanation:
Given parameters:
Mass of carbon dioxide = 250g
Molar mass of carbon dioxide = 44.01g/mol
Unknown:
Number of moles of carbon dioxide = ?
Number of molecules of carbon dioxide = ?
Solution:
We first find the number of moles of carbon dioxide;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Number of moles = [tex]\frac{250}{44.01}[/tex] = 5.68moles
From mole concept;
1 mole of a substance contains 6.02 x 10²³ molecules
5.68 mole of carbon dioxide will contain 5.68 x 6.02 x 10²³
= 3.42 x 10²⁴molecules
Mark and Amanda conduct the same investigation as Nguyen, but they use four rocks. They test the same three rocks as Nguyen but add one more rock that has the same color and density as limestone. However, the rock doesn't produce bubbles when acid is added to it. Explain how the mineral composition of this rock compares with that of limestone?
Answer:
The Rock does not contain carbonate in it.
Explanation:
Limestone(CaCO_3) when reacts with a acid produces carbon dioxide, which comes out as bubbles in the solution. It means the 4th rock does not have carbonate in it. Carbonate minerals are unstable in contact with hydrochloric acid. When acid begins to effervesce (fizz) on a specimen. These bubbles confirms the presence of carbonate in mineral.
Answer:
no,exept y and z are similar
Explanation:
litterly what it says '-'
Which statement accurately represents the properties of these moles.. help ASAP, teacher didn’t teach me this
Answer:
1 mole of O₂ has more mass compared to 1 mole of Na
Explanation:
1 mole oxygen atom and 1 mole of Na atom has the same number of particles.
A mole of any substance has the Avogadro number of particles which is
6.02 x 10²³
Mass of a substance = number of moles x molar mass
Molar mass of O₂ = 2(16) = 32g/mol
Molar mass of Na = 23g/mol
Mass of O₂ = 1 x 32 = 32g
Mass of Na = 1 x 23 = 23g
So, 1 mole of O₂ has more mass compared to 1 mole of Na
What best describes the bonding in a carbon dioxide molecule?
a. Carbon transfers two electrons to each of the two oxygen atoms.
b. Carbon shares 2 pairs of electrons with each oxygen.
c. Carbon shares a pair of
electrons with each oxygen atom.
d. Carbon receives two electrons from each of the two oxygen atoms.
Answer:
B. Carbon shares 2 pair of electrons with each oxygen.
Explanation:
Carbon dioxide is formed from combustion reactions, which involves a reaction between carbon and oxygen gas. Carbon dioxide molecule is formed from one carbon atom and two oxygens. As an element, carbon only has 4 outer shell electrons and oxygen 6. The two atoms require to gain electrons to achieve a stable configuration; carbon require to gain four electrons and oxygen requires two electrons. Double covalent bonds form between the atoms, where two electrons from each atom are shared making 4 bonding electrons in total.Hope it helped!
a sample of methane gas at a pressure of 0.815 atm and a temperature of 265 C occupies a volume of 416 mL. If the gas is heated at constant pressure until its volume is 593 ml the temperature of the gas will be _________ C
Answer:
493.9°C
Explanation:
Given parameters:
Initial pressure =0.815atm
Initial temperature = 265C = 265 + 273 = 538k
Initial volume = 416mL = 0.416L
New volume = 593mL = 0.593L
Unknown:
New temperature =?
Solution:
Since we are dealing with constant pressure condition, we apply charles's law.
It states that the volume of a fixed mass of gas varies directly as its absolute temperature if the pressure is constant.
Mathematically ;
[tex]\frac{V1}{T1}[/tex] = [tex]\frac{V2}{T2}[/tex]
V1 is the initial volume V2 is the new volume
T1 is the initial temperature T2 is the new temperature
[tex]\frac{0.416}{538}[/tex] = [tex]\frac{0.593}{T2}[/tex]
T2 = 766.9K;
In °C = 766.9 - 273 = 493.9°C
Question 5 (5 points)
True or False. Open clusters are groups of up to a few thousand stars that are loosely held together by gravity and
tend to appear blue.
Answer:
have a p000000000000000000
A wave in which particles of matter vibrate at right angles to the direction
the wave travels is called a(n) wave.
Enter the answer
Check It
Answer:
it will transverse wave I think it will help you
