Queston
Which equation shows how to calculate how many grams (g) of KOH would
be needed to fully react with 4 mol Mg(OH)2? The balanced reaction is:
MgCl2 + 2KOH → Mg(OH)2 + 2KCI
OA. mol Mg(OH),
2 mol KOH
mol Mg(0H),
56.10 g KOH
1 mol KOH
2 mol KOH
1 mol Mg Cl,
56.10 g KOH
1mol KOH
OB. mol Mgch
1
1mol Mg(OH),
2 mol KOH
1mol Ma(0H),
56.10 g KOH
1 molkOH
mol Mg (OH,
1 mol KOH
2 mol Ma(OH)
56 10 g KOH
1mol KOH
OD.
Answers
Answer:
C
Explanation:
We know that the molar mass of KOH is 56 gmol-1
Molar mass of Mg(OH)2 is 58.31 g/mol
Now; the balanced reaction equation is; MgCl2 + 2KOH → Mg(OH)2 + 2KCI
Hence;
2 moles of KOH yields 1 mole of Mg(OH)2
4 moles of KOH yields;
4 moles of KOH/1 mol * 1 mole Mg(OH)2 /2 moles KOH * 58.31 g Mg(OH)2 / 1 mole Mg(OH)2
So option c is correct
Answer:
4mol MG(OH)2/1 * 2mol KOH/1 mol MG(OH2) * 56.10g KOH/1 mol KOH
Explanation:
Took the test
Related Questions
Two inductors are connected in series to a 120 volt, 60 Hz line. The values are .75 H and 1.47 H. The total inductive reactance is
Answers
Answer:
837.02 ohms
Explanation:
Step one:
Given data
Frequency= 60Hz
L1= 0.75H
L2= 1.47H
When inductors are connected in series, the total inductance is the sum of the individual inductance
Step two:
Inductor 1
[tex]Xl1= 2\pi fL\\\\Xl1= 2*3.142*60*0.75\\\\Xl1= 282.78 ohms[/tex]
Inductor 2
[tex]Xl2= 2\pi fL\\\\Xl2= 2*3.142*60*1.47\\\\Xl2= 554.24 ohms[/tex]
The total inductance is
=282.78+554.24
=837.02 ohms
(1) Phosphorus silicon is a semi-conductor
Answers
When Silicone is altered with Phosphorus, 4 of its electrons form covalent bonding and the 5th electron becomes delocalized and thus it increases electrical conduction
Answer:
blue blah blue blah
Explanation:
How many electrons would Fluorine have to gain or lose to become stable?
Answers
Answer:
is most likely to gain one electron to form an ion with a 1- charge.
Which reaction is the opposite of a decomposition reaction?
Question 3 options:
Electrolysis of Water
Synthesis
Combustion
Explosion
Answers
Answer:
B) Synthesis reaction
Explanation:
synthesis reactions because they take apart larger molecules or compounds
Hope that helps
Which statement describes how the sun gets its light?
A. It bends light.
B. It reflects light.
C. It refracts light.
D. It makes its own light.
Answers
Answer:
D
Explanation:
it's a star it has gas and makes it own light
Which of these factors are biotic? (SELECT ALL THAT APPLY.)
animals
light
minerals
water
plants
Answers
Answer:
plants
Explanation:
because it produces ( i am a third grade student and don't know if it is right or not)
Which of the following conditions does not affect equilibrium?
A. Particle Size
B. None of these
C. Concentration
D. Pressure
Answers
Answer:
B. None of these
Explanation:
48 g of Aluminum will produce how much heat (in kJ) for this reaction?
Use the following reaction:
2 Al + 3 CuSO4 → 3 Cu + Al2(SO4)3 ∆H = -680 kJ
Round your answer to a positive whole number and do not write the unit.
Answers
The heat produced from 48 g Aluminium = -578
Further explanationGiven
Reaction
2 Al + 3 CuSO4 → 3 Cu + Al2(SO4)3 ∆H = -680 kJ
48 g of Aluminum
Required
Heat released
Solution
mol of Aluminium = mass : Ar Al
mol = 48 g : 27 g/mol
mol = 1.78
From the reaction, heat released for 2 moles Al, so for 1.78 Al, the heat released :
[tex]\tt \dfrac{1.7}{2}\times -680~kJ=-578~kJ[/tex]
How does energy from Earth’s interior affect surface changes?
Answers
Answer:
Energy produced deep inside Earth heats rock in the mantle. ... As it becomes less dense, the heated rock rises toward Earth's surface. The cooler, denser rock surrounding the heated rock sinks, as Figure 5 shows. In this way, heat inside Earth moves toward the cooler crust.
Explanation:
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Energy from Earth’s interior affect surface changes due to:
Earth heat transport occurs by conduction, mantle convection, hydrothermal convection, and volcanic advection. Thus, about 99% of Earth's internal heat loss at the surface is by conduction through the crust, and mantle convection is the dominant control on heat transport from deep within the Earth.Tectonic processes and flow in Earth's interior drive deformation of Earth's surface that can lead to destructive earthquakes, tsunamis, and volcanic eruptions.Learn more:
brainly.com/question/25543134
A certain ore is 37.3 % nickel by mass. How many kilograms of this ore would you need to dig up to have 65.0 g of nickel
Answers
Answer:
0.174kg of Ore are required
Explanation:
The ore of 37.3% in nickel by mass means that in 100g of ore there are 37.3g of nickel. As we need to obtain 65g of nickel we can convert this mass to mass of ore using the conversion factor (100g Ore / 37.3g Nickel) as follows:
65g of nickel * (100g Ore / 37.3g Nickel) = 174g of Ore are needed to have 65.0g of nickel. In kilograms:
174g Ore * (1kg / 1000g) =
0.174kg of Ore are requiredWhat ara the differences between the homolytic and heterolytic bond dissociation ? And why homolytic dissociation energy of H-H (104 KJ/mol) is lower than its heterolytic bond dissociation energy (401 KJ/mol)?
Answers
Answer:
Following are the difference in homolytic and hetrolytic bond dissociation.
Homolytic dissociation is referred as the amount of energy released during homolytic fission. Homolytic fission is known as the dissociation of chemical bond in two equal fragmentswhereas, Hetrolytic dissociation is referred as the amount of energy released during Hetrolytic fission. Hetrolytic fission is known as the dissociation of chemical bond in two unequal fragments.Homolytic fission gives one electron each to its fragments whereas Hetrolytic fissiongives two electron to one fragment and zero electron to other fragment.Energy released during Homolytic fission is lower than the Hetrolytic fission as the electron distribution to its fragments is uniform in homolytic whereas electron distribution to its fragments is uniform in hetrolytic fission.
Thus bonds form in hetrolytic fission is more stronger than the the bonds formed in homolytic fission.
Hence, more energy is required to break the bonds of hetrolytic fission as compared to homolytic fission
Thus, homolytic dissociation energy of H-H (104 KJ/mol) is lower than its heterolytic bond dissociation energy (401 KJ/mol)
9. Which atom is more likely to make a positive charge?
Oxygen or Hydrogen
Answers
What is the name of the compound whose formula is Re2O
Answers
Answer:
im not myself with nitro gone
Explanation:
When baking soda and vinegar react, the surface bubbles. What does this most likely indicate?
a chemical change, because a precipitate is being formed
a chemical change, because a gas is being formed
a non chemical change, because a precipitate is being formed
a non-chemical change, because a gas is being formed
Answers
Answer: B
a chemical change, because a gas is being formed
Explanation:
Answer:
B
Mark Brainliest please
Explanation:
(4) NH3+02- NO+H2O
balance the equation
Answers
Answer:
4NH₃ + 5O₂ —> 4NO + 6H₂O
Explanation:
NH₃ + O₂ —> NO + H₂O
The above equation can be balance as follow:
NH₃ + O₂ —> NO + H₂O
There 3 atoms of H on the left side and 2 atoms on the right side. It can be balance by 4 in front of NH₃ and 6 in front of H₂O as shown below:
4NH₃ + O₂ —> NO + 6H₂O
There are 4 atoms of N on the left side and 1 atom on the right side. It can be balance by putting 4 in front of NO as shown below:
4NH₃ + O₂ —> 4NO + 6H₂O
There are 2 atoms of O on the left side and a total of 10 atoms on the right side. It can be balance by putting 5 in front of O₂ as shown below:
4NH₃ + 5O₂ —> 4NO + 6H₂O
Thus, the equation is balanced.
Suppose that you take a sample of 500 g of ocean water and let the water evaporate. The mass of the remaining salts is 17 g. What was the salinity of the ocean water
Answers
Answer: The salinity of ocean water is 34 ppt.
Explanation:
Salinity is defined as the number of grams of salts present per kilogram of seawater. It is expressed in parts per thousand.
The formula used to calculate the salinity of ocean water or sea water is:
[tex]\text{ Parts per thousand}=\frac{\text{Mass of salts}}{\text{Mass of sea water}}\times 1000[/tex]
We are given:
Mass of salts = 17 g
Mass of sea water = 500 g
Putting values in above equation, we get:
[tex]\text{ Parts per thousand}=\frac{17g}{500g}\times 1000\\\\\text{ Parts per thousand}=34[/tex]
Hence, the salinity of ocean water is 34 ppt.
How many atoms are in 1 mole of water, H2O?
Answers
Answer:
1.807×10and at the top of ten put -24
2. If an object is buoyant, then it will
(3 Points)
fioat
sink
Answers
Answer: If an object is buoyant, then it will float
Explanation:
Buoyancy is the term which describes a type of force which is also known as the upthrust force. This is an upward force upward force exerted by a fluid that opposes the weight of an immersed object.
The objects which are lighter than water easily float on the water due to the existence of this force and the objects which are heavier than water sink in the water due to the existence of this force.
Thus if an object is buoyant, then it will float.
please help thank u appreciate it
Answers
Answer:
option B
hope it helps! please mark me brainliest
Which has a bigger surface area, powder or marble chips
Answers
Answer:
powder
Explanation:
Between the powder and marble chips, the powder will have a larger surface area.
For the same masses of a solid substance in different forms such as lump, granules or powder, the smaller particle size of each form the larger the surface area.
Surface area increases from lumps to granules and them powder
A powder has the largest surface area and hence undergoes a more faster chemical reaction.Which symbol can be used to indicate the pressure at which a chemical reaction is carried out?
25°C
OA
2 atm
Pt
Answers
Answer:
2 atm
Explanation:
The symbol 'atm' is used for pressure. Hence, the symbol used to indicate the pressure at which a chemical reaction is carried out can be, 2 atm.
Balance the following chemical equation: N2H4+O2→ NO2+H2O
Answers
Answer:
N2H4 + 3O2 → 2NO2 + 2H2O
Explanation:
PLS HELP ASAP THIS IS DUE TODAY
Answers
Answer: what grade are u in ill help
Explanation:
What happens at the anode in an electrolytic cell?
A. Turning an ion into an uncharged atom
B. Melting
C. Reduction
D. Oxidation
Answers
Answer:
D. Oxidation
Explanation:
In an electrolytic cell, oxidation (the loss of electrons) takes place at the anode. At the cathode reduction takes place.
A mnemonic technique that could be used is that the process that starts with a vowel (Oxidation) takes place at the place that also starts with a vowel (Anode).
b. Potassium is more reactive than Sodium.
Answers
Answer:
Potassium is more reactive than sodium. Potassium is a bigger atom and has lesser ionisation energy than sodium so it is more reactive.
Select the correct answer.
Which of these activities increases the amount of carbon in the atmosphere?
O A.
animals eating plants
OB. burning of fossil fuels
OC. fossilization
O D.
photosynthesis
Answers
determine the molar mass for ammonia (NH3) in g/mol.
Answers
Answer:
17.031 g/mol
Explanation:
ANYONE CAN HELP ME WITH THIS PLEASE ?
Answers
Answer:
0.2g
Explanation:
mass=mole/molar mass
molar mass of oxygen is 32
6.06/32=0.19 or 0.2 units=grams
The combustion of propane (C3H8) creates water and CO2. Looking at the
reaction below, which of the following would be the mole ratio between propane
and carbon dioxide? *
C3H8 +502->4H2O + 3C02
A)3 mole CO2 / 5 mole C3H8
B)3 mole C3H8/4 mole CO2
C)3 mole CO2 / 1 mole C3H8
D)3 mole C3H8 / 1 mole CO2
Answers
Answer:
C)3 mole CO2 / 1 mole C3H8
Explanation:
___C3H8 + ___O2 --> ___H2O + ___CO2
Answers
Answer:
C3H8 + 5O2 ‐‐‐‐‐‐‐‐> 4H2O + 3CO2