The percent composition of this compound :
Mg = 72.182%
N = 27.818%
Further explanationGiven
9.03 g Mg
3.48 g N
Required
The percent composition
Solution
Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
Total mass of the compound :
= 9.03 g + 3.48 g
= 12.51 g
The percent composition :
Mg : 9.03/ 12.51 g x 100% = 72.182%
N : 3.48 / 12.51 g x 100% = 27.818%
PLs help mweee Ill mark brainliest
Answer:
I'm pretty sure that it's plate movement...
The specific heat capacity of copper is 0.385 J/(gK). If 353 J of heat are added to 3.6 moles of copper at 283 K, what is the final temperature of the sample of copper?
Answer:
287K
Explanation:
To find the increasing in temperature for the sample of copper we must use the equation:
Q = m*C*ΔT
Q is the heat added (353J)
m is the mass of copper (3.6mol * (63.546g / mol) = 228.8g
C is specific heat (0.385J/(gK))
And ΔT is the increasing in temperature.
Solving for ΔT:
Q / m*C = ΔT
353J /228.8g*0.385J/(gK) = 4.0K
That means the final temperature of copper is:
283K + 4K =
287KILL MARK AS BRAINLESS PLS HELP
Problems 4-6 convert the measurements into moles.
4. 9.03 x1023 C atoms
5. 2.44x1023 H2O molecules
6. 6.02x1023 Li atoms
Answer:
4. 1.5moles
5. 0.405moles
6. 1 mol
Explanation:
To find the number of moles in each susbtance in this question, we divide each number of atom/molecule measurement by Avagadro's number (6.02 × 10^23 atoms)
That is; nA = n × 6.02 × 10^23 atoms
n = nA ÷ 6.02 × 10^23 atoms
Where;
nA = number of atoms
n = number of moles
4.) n of Carbon = 9.03 x 10^23 ÷ 6.02 × 10^23
n = 1.5 × 10^ (23-23)
n = 1.5 × 10^0
n = 1.5 × 1
n = 1.5moles.
5.) n of H2O = 2.44 x 10^23 ÷ 6.02 × 10^23
n = 0.405 × 10^ (23-23)
n = 0.405 × 10^0
n = 0.405moles
6.) n of lithium = 6.02 x 10^23 Li atoms ÷ 6.02 × 10^23
n = 1 × 10^ (23-23)
n = 1 × 10^0
n = 1 mol
i need help please this is due today
What is the yearly exposure from wearing a watch with a luminous dial?
If the density is 0.9g/cm3 and the volume is 1.5cm3 ? What is the Mass?
Answer:
1.35g
Explanation:
times the density and volume together to get the mass
0.9 x 1.5 = 1.35g
2. You have 200g or a solution that contains 30g of hydrochloric acid (HCI),
what percentage of your solution is made up of HCI acid?
Answer:
the percentage of your solution that made up of HCI acid is 15%
Explanation:
The computation of the percentage of your solution that made up of HCI acid is given below:
Given that
There is 200g or a solution that have 0 g of hydrochloric acid (HCI)
Based on the above information
The percentage is
= 30g ÷ 200g
= 15%
Hence, the percentage of your solution that made up of HCI acid is 15%
The pedigree diagram shows how a dominant trait is inherited in a family. The red circle and squares show family members with the trait. Based on the pedigree diagram, who must be heterozygous for the trait? A. The child with the trait B. The child without the trait C. Only one parent D. Both parents
Answer:
D
Explanation:
Correct on A P E X
Car 1 has a body made from aluminium and car 2 has a body made from steel. Which car is likely to
have the better fuel economy?
Answer:
1
Explanation:
Um well if a car is made out aluminum keep in mind the engine = heat and stuff the type of stuff that would burn would cause chemicals/ white flame to form the trioxide aluminum(lll) oxide, Al small 2 O small 3. With Steel this would burn off bits of rust/ion oxide
I could be wrong but thats the best answer i can give sorry mate
1. Electronegativities of the elements Be, Mg, Ca, and Sr follow a specific trend within their group. Based on this trend, the atoms of which element will have the least attraction for an electron?
A) Be.
B) Mg.
C) Ca.
D) Sr.
2. Which element has a larger atomic radius than sulfur?
A) Chlorine.
B) Cadmium.
C) Fluorine.
D) Oxygen.
3. Which ion was formed by providing the second ionization energy to remove an electron?
A) Ca2+.
B) N3–.
C) Fe3+.
D) S2–.
4. The most negative electron affinity is most likely associated with which type of atoms?
A) Large nonmetal atoms.
B) Small nonmetal atoms.
C) Large metal atoms.
D) Small metal atoms.
5. Selected properties of antimony (Sb) and iodine (I) are listed in the table below.
Element AtomRadius(pm) 1st IonEnergy(kJ/mol) ElectroAffinity(kJ/mol) Electronegative
Sb 145 ? –103 2.05
I 140 1008 –295 ?
Which predictions can most likely be made?
Sb has a lower ionization energy but a higher electronegativity than I.
Sb has a higher ionization energy but a lower electronegativity than I.
Sb has a lower ionization energy and a lower electronegativity than I.
Sb has a higher ionization energy and a higher electronegativity than I.
6. Which correctly summarizes the trend in electron affinity?
A) It tends to be very high for group 2.
B) It tends to be more negative across a period.
C) It tends to remain the same across periods.
D) It tends to be more negative down a group.
7. Which explains the change in ionization energy that occurs between removing the first and second electrons from an atom?
A) The ionization energy decreases because the ratio of the protons to electrons increases.
B) The ionization energy increases because the ratio of the protons to electrons increases.
C) The ionization energy decreases because the ratio of the protons to electrons decreases.
D) The ionization energy increases because the ratio of the protons to electrons decreases.
8. Which element would most likely have an electron affinity measuring closest to zero?
A) Na.
B) Al.
C) Rb.
D) Ar.
9. Electronegativities of the elements Na, Al, P, and Cl follow a specific trend across the period. Based on this trend, an electron will be most strongly attracted to
A) Na.
B) Al.
C) P.
D) Cl.
10. Which best describes ionization energy?
A) Energy needed to add an electron to a neutral atom in the gas phase.
B) Energy needed to add an electron to a neutral atom in the liquid phase.
C) Energy needed to remove an electron from an atom or ion in the gas phase.
D) Energy needed to remove an electron from an atom or ion in the liquid phase.
Answer: B D B A C B E D A B
Explanation:
2. In the space below, describe why it rains. Include the words that scientists use
when talking about how water changes from liquid to gas and back to liquid
again
9 of 16
9.
A student drops a ball from 5 feet above the ground. After bouncing once, it only reaches
a maximum height of 4 feet above the ground.
Use energy terms to explain why the ball did not reach its original height after bouncing
once.
A. Some energy was lost
B. Some energy was transferred to the floor and air
C. Some energy disappeared when it hit the floor
D. Some energy was destroyed
A compound has a percent composition of 24.74% potassium (molar mass = 39.10 g/mol), 34.76% manganese (molar mass = 54.94 g/mol), and 40.50% oxygen (molar mass = 16.00 g/mol).
Assuming that the mass of the compound is 100 g, what is the compound’s empirical formula?
Answer: KMnO4
Explanation:
Which of the following statements is true? Chemical reactions are the same as atomic reactions. The sun uses nuclear fusion reactions to generate heat. Nuclear power can't be used to do beneficial work. Nuclear fission is more dangerous than nuclear fusion.
Answer:
The sun uses nuclear fusion reactions to generate heat.
Explanation:
It is true from the given choices that the sun uses nuclear fusion reactions to generate heat.
The heat that accompanies nuclear fusion reactions is very huge. In fact this is the source of energy for the whole solar system.
During a nuclear fusion reaction, small atomic nuclei combines to form larger ones.
This combination results in a series of chain reactions that releases energy.
(7th grade science question)
In baking and science, do you think it is better to measure loose solids (like flour or sugar) by volume or mass? Why?
Answer:
id say mass
Explanation:
but i d k
Atoms of which two elements have a combined total of 23 protons?
A.Sodium, Na, and magnesium, Mg
B.Boron, B, and carbon, C
C.Copper, Cu, and zinc, Zn
D.None of these
Answer:
A
Explanation:
Sodium has 11 electrons and Magnesium has 12 electrons. Since here you need to consider atoms, they must have equal amount of protons as electrons to be considered neutral, and so an atom.
So simply 11+12 =23
BRAINLIST!!
A river flowing through a floodplain shapes the region through the processes of weathering, erosion, and deposition. Which of the following is an example of the river forming a depositional feature?
A.
As the water's speed increases, it scours deep grooves in the muddy river bottom.
B.
As the water flows along the outside edge of a curve, it removes rock and soil from the river bank.
C.
As the water's speed decreases along the inside edge of a curve, sediment is laid down to form a point bar.
D.
all of these
Answer:
B
as the flows along the outside edge of a curve it removes rock and soil from the river bank
What is the formula for flow rate?
Answer:Solve for X+ 2x=
Explanation:
1. If a cell has waste it needs to store, it will store it:
Do you think that it is necessary and/or important to take a multivitamin everyday to maintain optimal health? What might help you answer this question? What types of things might influence your decision to take a multivitamin every day?
What's ur opinion with explanation???????!!!!!!!!!!
Which of the following materials has the highest density?
A. O water vapor
B. O steam
C. O liquid water
D. O ice
Answer:
Answer is C. liquid water.
Explanation:
I hope it's helpful!
Liquid water has the highest density. Therefore, the correct option is option C among all the given options.
What is density?The density of a substance is defined just like its weight per unit volume. In other words, density is the mass-to-volume ratio or mass for every unit volume. It quantifies how much "stuff" a thing possesses in an unit volume (cubic meter or cubic centimeter).
Density is a measure of how closely stuff is packed together. The density principle was established by the Greek scholar Archimedes, which is simple to compute if one know the equation and its associated units. Lquid water has the highest density.
Therefore, the correct option is option C among all the given options.
To learn more about density, here:
https://brainly.com/question/29775886
#SPJ6
What is the percent composition of Diphosphorus pentachloride? Round your answers to the hundredths place.
Answer: P: 25.898% CI: 74.102 %
Explanation: Use the formula, Mass % = mass/total Mass x 100%, to solve.
An atom has 9 protons and 7 electrons. What is its overall charge?
Answer:
Positive
Explanation:
If an atom has more protons than electrons, its overall charge will be positive. Protons have a positive charge, electrons have a negative charge.
Can someone help me answer this ASAP !!!
Answer: Chlorine I think
Explanation:
Chlorine is added to the water to kill germs. When it is added to a swimming pool, it forms a weak acid called hypochlorous acid that kills bacteria like salmonella and E.
Answer: Chlorine!
Explanation:
When it is added to a swimming pool, it forms a weak acid called hypochlorous acid that kills bacteria like salmonella and E. coli, as well as germs that cause viruses such as diarrhea and swimmer's ear.
What is the name for this? Please help !!!!!!
Answer:
Explanation:
i think it is 2-ethyl-4-methylhexane
1. OBJECT A HAS A TEMPERATURE OF 78K AND OBJECT B HAS A
TEMPERATURE OF 125K. HOW DOES HEAT FLOW? What happens to the
temperature of each object?
Answer:
The law of heat conduction, also known as Fourier's law, states that the time rate of heat transfer through a material is proportional to the negative gradient in the temperature. As the temperature difference is bigger, the rate of temperature change will be bigger.
Explonation:
sorry if doesnt
help
what are ions and how do they work please send me answer
Answer:
hope it helps
please mark me brainliest
Explanation:
An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule. An atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.
9
A 75 gram sample of water is initially at 30 degrees Celsius. What would it's temperature be if
it absorbed 2000 J of heat?
Answer:
T2 = 36.38°C
Explanation:
Given data:
Mass of water = 75 g
Initial temperature = 30 °C
Final temperature = ?
Heat absorbed = 2000 J
Solution:
Specific heat capacity of water is 4.18 J/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = Final temperature - initial temperature
2000 J = 75 g×4.18 J/g.°C × T2- T1
2000 J = 313.5 J/°C × T2- T1
2000 J = 313.5 J/°C × T2 - 30 °C
2000 J / 313.5 J/°C = T2 - 30 °C
6.38 °C = T2 - 30 °C
T2 = 6.38 °C + 30°C
T2 = 36.38°C
Two siblings express different eye colors. The brother has brown eyes but the sister has blue eyes. Which statement explains why the siblings express different eye color? *
The brother received genes only from his father, and the sister received genes only from her mother.
The siblings each received a different combination of genetic information from their parents.
The brother received fewer genes from his other than his sister received.
Answer:
The siblings each received a different combination of genetic information from their parents.
Explanation: