Answer:
0.119 moles
Explanation:
molar mass of Fe = 55.845g
to find moles = mass/ molar mass
so moles of Fe = 20/55.845
= 0.358 moles
for the equation you are given
for every three Fe, it produces 1 Fe3O4 , meaning the ratio is 3:1
if you have 0.358 moles of Fe, that means the number of moles of Fe3O4 will equal to one third of that,
thus
moles of Fe3O4 = 1/3 x 0.358 = 0.119
PLS HELP A gas has a volume of 250 mL at 96.5 kPa. What will the pressure of the gas be if the
volume is decreased to 150 mL? Assume the gas stays at a constant temperature.
Answer:
Solve the following problems (assuming constant temperature). Assume all numbers are 3 sig figs. 1. A sample of oxygen gas occupies a volume of 250 mL at 740 torr pressure. ... the gas exert if the volume was decreased to 2.00 liters? ... A 175 mL sample of neon had its pressure changed from 75.0 kPa to 150 kPa.
Explanation:
Pleade help me! (If you guys unfortunately I am going to report you) Thank you
Answer:
answer 3
Explanation:
When people say that something "adapts" to a situation or environment, changing so that they are comfortable or better suited to survive. Why is this statement incorrect in a scientific sense? Explain your understanding of scientific adaptation and why this statement presents a misconception.
On the periodic table, what is a group? For the main groups, what characteristic
do the elements have in common?
Answer:
The s-, p-, and d-block elements of the periodic table are arranged into 18 numbered columns, or groups. The elements in each group have the same number of valence electrons. As a result, elements in the same group often display similar properties and reactivity.
Explanation:
On the periodic table, a group refers to a vertical column of elements that share similar chemical properties.
For the main groups, the characteristic do the elements have in common is valence electron configuration and chemical reactivity.
On the periodic table, a group refers to a vertical column of elements that share similar chemical properties. These elements are arranged in such a way that they have the same number of valence electrons, which are the electrons in the outermost energy level (shell) of their atoms. The number of valence electrons is a critical factor in determining the chemical behavior and reactivity of elements, as it governs their ability to form chemical bonds with other elements.
Main group elements, also known as representative elements, are located in the s-block and p-block of the periodic table. These elements are found in Groups 1, 2, and 13 to 18. Each main group is labeled with a number from 1 to 18.
Here are the main characteristics that elements in the same main group (vertical column) have in common:
1. Valence Electron Configuration: Elements in the same main group have identical valence electron configurations. For example, elements in Group 1 (alkali metals) all have one valence electron in their outermost energy level (ns¹), while elements in Group 18 (noble gases) have a full outermost energy level.
2. Chemical Reactivity: Due to their identical valence electron configuration, elements in the same group show similar chemical reactivity. They tend to form similar types of chemical bonds and react similarly with other elements to achieve a more stable electron configuration.
3. Periodic Trends: Main group elements within a group exhibit predictable trends in their physical and chemical properties as you move from the top to the bottom of the group. For example, the atomic radius tends to increase, ionization energy tends to decrease, and metallic character tends to increase as you go down a group.
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How many moles of NH3 can you make from 6.20 moles of N2?
The term mole concept is used here to determine the moles of ammonia. The number of moles of ammonia which can be make from 6.20 moles of N₂ is 12.4.
What is a mole?One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:
Number of moles = Given mass / Molar mass
You need one nitrogen atom to produce ammonia. Here we can see that there are two nitrogen atoms in N₂.
One mole of any substance contains Avogadro number of molecules. A mole is defined as the mass of the substance which consists of the equal quantity of basic units.
The number of moles of ammonia from 6.20 moles of N₂ is:
6.20 × 2 = 12.4
Thus the number of moles is 12.4.
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The reaction 2NoBr(g) ---> 2NO(g)+Br2(g) is a second order reaction with a rate constant of 0.80M^-1 s^-1 at 11 C. If the initial concentration of NOBr is 0.0440 M, the concentration of NOBr after 12 seconds is _________.
Answer:
noe sory opwqkfj
s
Explanation:
Brainliest to right answer
how much energy is used to raise the temperature of 3kg of aluminium from 18°C to 23°C? Use the table below and this equation: Q=mc T
A. 13,455 J
B. 2691 J
C. 13.455
D. 4.485 J
How much energy is required to raise the temperature of 3 kg of aluminum from 18°C to 23°C? Use the table below and this equation: Q=mcΔT
1What are 2 examples of proteins in the body?
Answer:
1. Insulin
2. Keratin
Explanation:
Proteins are one of the four biological molecules found in living systems. They are polymeric molecules made up of monomeric units called AMINO ACIDS. Proteins perform a wide variety of functions in the body ranging from enzymatic functions to structural roles.
Two examples of proteins found in the body are keratin, insulin. Keratin is a structural protein located in the skin, hair and nails while insulin is an enzymatic protein that aids in digestion.
What does Boyle's Law describe?
Answer: Image result for What does Boyle's Law describe?
This empirical relation, formulated by the physicist Robert Boyle in 1662, states that the pressure (p) of a given quantity of gas varies inversely with its volume (v) at constant temperature; i.e., in equation form, pv = k, a constant.
Explanation:
Hi! I need some help with this pleaseeee!!
When two objects of different temperatures are placed in contact with one another, eventually: (choose one option from below)
a) both their average kinetic energy and temperature will be the same
b) their average kinetic energy will be the same
c) neither their average kinetic energy and temperature will be the same
d) their temperature will be the same
What is the term for combining 2 or more atoms together?
atom
O molecule
O element
O compound
Match “the same” or “different” to each sentence.
Answer:
different , same, same, same
PLEASE ASAP! i have c,d,e and f but if anyone can do even one of them please help! (igcse y10 btw)
Answer:
C
i) 2 C(s) + O2(g) → 2 CO
ii) Carbon monoxide poisoning occurs when carbon monoxide builds up in your bloodstream. When too much carbon monoxide is in the air, your body replaces the oxygen in your red blood cells with carbon monoxide. This can lead to serious tissue damage, or even death.
D
The iron oxide gets reduced.
The carbon gets oxidised.
E
the reason is that aluminium is more reactive than carbon to be extracted in a blast furnance.an element lying lower in the metal reactivity series can be reduced by carbon (a reducing agent) but aluminum lies above carbon metal series.
F
i) electrolysis.
ii) It is soft and malleable. Aluminium is used in a huge variety of products including cans, foils, kitchen utensils, window frames, beer kegs and aeroplane parts. This is because of its particular properties.
Can you help me pretty please !!!
5.2 X 1026 molecules of CH4
I cant send this with no text
Have a nice day
The cells of all organisms must produce energy in order for the cell to survive and function. The diagrams below show
different parts of an animal cell and a plant cell.
In which organelle is energy produced in both plant and animal cells?
O Ribosomes
Nucleus
Chloroplast
O Mitochondria
Answer:
Mitochondria Is produced by both animal and plant cells
Explanation:
13. If a chemist has 12.3 moles of N H 03, what is the mass of the sample?
Answer:
209.4831 g
Explanation:
number of moles × molar mass = mass of substance in g
12.3 × ( 14.0067 + 1.00484 × 3 ) = 209.4831 g
Sodium carbonate is commonly known as washing soda and is used in detergents as a water softener. What is the molarity of 5.30 g of sodium carbonate, Na₂CO₃, dissolved in 50 L solution?
Answer:
0.1 m
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What causes the high luster of a metal?
a
excitation of electrons into empty orbitals
b mobility of electrons
C easily ionizable metal atoms
d their low melting points
Answer:
When light is shone on to the surface of a metal, its electrons absorb small amounts of energy and become excited into one of its many empty orbitals. The electrons immediately fall back down to lower energy levels and emit light. This process is responsible for the high luster of metals.
Explanation:
Your well-wisher :-)
Look at the imagine show. Above
What phase does the moon show?
A. waxing gibbous
B. waning gibbous
C. third quarter
D. first quarter
Answer: D
Explanation:
Trust me please
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what is the formula for carbon decabromide?
Answer:
CBr4
Explanation:
Answer:
CBr4
Explanation:
It is CBr4 I hope it helps
1)how is ice made?
2)what materials does it use?
3)how is it put together
Answer:
milk and sugar and vinillia it uses a machine and you stir until it forms
Explanation:
determine the volume in liters of metal sample weighting 352.2g and has a density of 7.10gmL.
Answer:
V = 0.0496 L
Explanation:
Given that,
The mass of a sample, m = 352.2 g
The density pf sample, d = 7.10 g/mL
We need to find the volume of the sample. We know that the density of an object is given by :
[tex]d=\dfrac{m}{V}\\\\V=\dfrac{m}{d}\\\\V=\dfrac{352.2}{7.1}\\\\V=49.6\ mL[/tex]
or
V = 0.0496 L
So, the volume of the sample is 0.0496 L.
How have scientists discovered the structure of atoms?
a.By looking at them under a microscope
b. By running experiments that expose their properties
c. By examining only the largest atoms.
d. Bysplitting them apart.
Answer:
Explanation:Well most scientists used microscopes but they also looked at bigger ones so the answer would be “by running experiments that expose there properties”
Brainliest to right answer
Suppose you add water to 6 g of sugar to make a solution with a concentration of 3 g/l What is the total volume of the solution?
Answer:
no
Explanation:
How many grams of Aluminum are needed to
produce 45.3 grams of Iron metal?
Waste water from nuclear power plants is generally
Answer:
waste water from nuclear power plant is
generally very harmful for our environment
and for everyone
hope it will help