Answers
Answer:
1. 36.5g 2. 103.3g
3. 140g 4. 151g
5. 159g
Explanation:
1. HCl
atomic mass of H= 1g
atomic mass of Cl = 35.5g
solution:
HCl
= 1+ 35.5
= 36.5g
2. ZnF2
atomic mass of Zn = 65.3g
atomic mass of F = 19g
solution:
ZnF2
= 65.3 + 2(19)
=65.3 + 38
= 103.3 g
3. K2CO3
atomic mass of K= 40g
atomic mass of C = 12g
atomic mass of O = 16g
Solution:
K2CO3
= 2(40) + 12 + 3 (16)
= 80 + 12 + 48
= 140g
4. FePO4
atomic mass of Fe = 56g
atomic mass of P= 31 g
atomic mass of O = 16g
solution:
FePO4
= 56 + 31 + 4 (16)
= 56 + 31 + 64
= 151g
5. Cu2S
atomic mass of Cu = 63.5g
atomic mass of S = 32 g
solution
Cu2S
= 2(63.5 )+ 32
= 127 + 32
=159g
Related Questions
A person wishes the heat pot of freshwater from 20°C to 100°C in order to boil water for pasta they calculate that their pot holds 2 kg of water and that they would need to apply 669,440 Joules of heat energy to produce the desire temperature change are the person calculations correct?defend your answer and demonstrate all relevant calculation
Answers
Q=mcΔt
669440 = 2.10³ x 4.184 x (100-20)
669440 = 669440 √ (correct)
which is the best definition of resistance
Answers
Balance this equation:
Al(s) + O2 (g) -> Al2O3 (s)
Answers
Mole O2 = 9.10 g/32 g/mol = 0.2844 mol From the balanced equation, the mole ratio of O2 to Al2O3 is 3:2. This means that 3 moles of O2 react with Al to produce 2 moles of Al2O3.
Which is more soluble in 100grams of H2O at 70 degrees Celsius?
A) NH4Cl
B) NaNO3
C) KCL
D) KNO3
Answers
Answer:
KCL
Explanation:
is more soluble in 100grams of H2O at 70 degrees Celsius?
In which of these systems is the entropy decreasing?
a liquid cooling
air escaping from a tire
snow melting
salt dissolving in water
Answers
Answer:
a liquid cooling
Explanation:
Liquid cooling results in liquid (more disorder) turning to solid (less disorder).
Entropy describe disorder in our system. Going from more disorder to less disorder decreases entropy.
Rest of the options increase entropy b/c gas escaping from tire releases gas from confined shape to vast environment, snow melting turns solid (order) into liquid (less order), and salt dissolving turns solid into liquid form.
The beakers on the left and right both contain the same amount of HCL (liquid) and the same mass of calcium carbonate (solid). In which beaker will the reaction rate be the greatest?
A) The reaction rate will be highest in beaker 1 because there is a larger surface area of calcium carbonate.
B) The reaction rate will be highest in beaker 2 because there is a larger surface area of calcium carbonate.
C) The reaction rate will be highest in beaker 1 because there is a smaller surface area of calcium carbonate.
D) The reaction rate will be highest in beaker 2 because there is a smaller surface area of calcium carbonate
Answers
Answer:
B
Explanation:
Smaller pieces results in a larger surface area, therefore the answer is beaker B.
All of the following use subjective scoring EXCEPT:
A. Diving
B. Figure Skating
C. Archery
D. Gymnastics
Answers
Answer:
Archery
Explanation:
Archery is scored based on point values assigned to the rings on the target.
What are the three main organic things found in healthy soil? (Select three.)
Answers
Answer:
Organic matter is composed of living things (plant roots and organisms), dead things (recent plant and animal residue), and very dead things (highly decomposed material, or humus).
Explanation:
hope this helps if not let me know have a great day
__Ag+__O2->__Ag20
what's the reaction?
Answers
Explanation:
4Ag + O2 -> 2Ag2O
Combination reaction
Synthesis reaction
the reaction of 2 elements forming compounds
4Ag + O₂ ⇒ 2Ag₂O
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
Answers
Convert 3.9 kcal into calories.
Answers
[tex]3.9 ~\text{kcal} = 3.9 \times 1000 ~ \text{cal} = 3900~ \text{cal.}[/tex]
At a particular temperature the solubility or NE in water is 0.0240 M when the partial pressure is 0.220 atm. What will the solubility (in m) be when the partial pressure of NE is 1.05atm?
Answers
It is expected at 1.05 atm the solubility increases if compared to the solubility at 0.222 atm.
What is the relationship between solubility and pressure?In general, an increase in pressure leads to an increase in solubility. In the same way, a decrease in pressure will decrease solubility.
What will happen at if the pressure is 1.05 atm?Considering the pressure increased, the most likely result is for the solubility to proportinally increase.
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A farmer buys a new plot of land on which to grow crops. The land he buys is very flat. The farmer's main concern with this plot of land is wind erosion because certain seasons are very windy in this area. He has a large budget for the project, but he does not want to spend a lot of time or money maintaining any erosion control method that he installs.
Which method of erosion control is probably most suitable for the farmer to use?
A. contour plowing
B. buffer strips
C. terracing
D. windbreak
Answers
A)Contour plowing and C)terracing are best methods to avoid soil erosion on flat lands.
On flat lands erosion takes place due to wind .
So his better option is contour plowing.
A student dissolves 4.51 grams of sodium hydroxide in 100.0 mL of water at 19.5 °C in a calorimeter. As the sodium hydroxide dissolves, the temperature of the surrounding water increases to 31.7 °C. What is the heat involved in the dissolving of the sodium hydroxide (the q)? Omg help meeeeee I’m in honors chem!
Answers
The heat involved in the dissolution of sodium hydroxide in the 100 mL of water is 5104.48 J
Data obtained from the question Mass of NaOH = 4.51 gVolume of water = 100 mL Initial temperature of water (T₁) = 19.5 °CFinal temperature of water (T₂) = 31.7 °C Heat of dissolving NaOH =?How to determine the heat
Heat lost by NaOH = heat gained by the water
Thus, we shall determine the heat gained by the water in order to obtain the heat of dissolution of NaOH.
The heat gained by the water can be obtained as follow:
Mass of water (M) = 100 gInitial temperature of water (T₁) = 19.5 °CFinal temperature of water (T₂) = 31.7 °CChange in temperature (ΔT) = 31.7 – 19.5 = 12.2 °C Specific heat capacity of the water (Cᵥᵥ) = 4.184 J/gºC Heat (Q) =?Q = MCΔT
Q = 100 × 4.184 × 12.2
Q = 5104.48 J
Thus, the heat of dissolution of NaOH is 5104.48 J
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`Pb(NO3)2 (aq) + LiBr(aq) →
Answers
Answer:
PbBr2 + LiNO3
And goodluck
Describe briefly a chemical test to identify a sample of each of the following gases in the laboratory. For each test include a short description of the procedure (method) and the expected observations.
Hyrogen gas
Oxygen gas
Carbon dioxide gas
Answers
Answer:
Am I the bad guy for killing my fish, let me explain?
Explanation:
The fish said a bad word that was incredibly inappropriate, so then I told him to never say that again. He responds with, "No, I CAN SAY WHATEVER I WANT." After that I told him to not yell at me and then I killed him, remember he's a fish (GoldFISH).
Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: S(g) + 3F2(g) ->SF6(g) If 50 g S is allowed to react as completely as possible with 105.0g F2(g), how many grams ofn SF6 can we get?
Answers
The quantity of SF6 that we can get is = 228.2g
Calculation of product formationThe quantity of S that reacted = 50g
The quantity of F2(g)that reacted = 105.0g
Therefore the quantity of SF6 that will be produced = ?
But molar mass of sulphur = 32g/mol
molar mass of SF6(g)= 146.06 g/mol
If 32g of S = 146.06 g of SF6
50 g of S = x
Make X the subject of formula,
X = 50×146.06/32
X = 7303/32
X = 228.2g of S
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If 150 grams of water is heated from 20°C to 30°C, the number of joules of
heat energy absorbed is...
Answers
Answer:
29/43
Explanation:because of the numbers
According to the ideal gas law, what
will be the volume of 0.25 mol of
nitrogen at 0.82 atm pressure and
57°C temperature?
Answers
Explanation:
Ideal Gas Law
PV = n R T
V = n R T / P n = moles R = gas constant = .082057 L atm / ( K mol)
T is in Kelvin
V = .25 moles * .082057 * (273.15 + 57) K / .82 atm = 8.3 moles
( two Sig Dig)
What is the wavelength of a wave that has a frequency of 60 Hz and a speed
of 45 m/s?
O A. 0.75 m
O B. 15 m
O c. 1.3 m
D. 2700 m
Answers
The wavelength of the wave having a frequency of 60 Hz and a speed of 45 m/s is 0.75 m (Option A)
Relationship between velocity, frequency and wavelengthThe velocity, frequency and wavelength are related according to the following equation:
v = λf
where
v is the velocityλ is the wavelengthf is the frequencyHow to determine the wavelengthFrequency (f) = 60 HzVelocity (v) = 45 m/sWavelength (λ) = ?λ = v / f
λ = 45 / 60
λ = 0.75 m
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How much energy does a 445 nm wave of light have? (The speed of light in a
vacuum is 3.00 x 108 m/s, and Planck's constant is 6.626 x 10-34 J•s.)
Answers
Answer:
A
Explanation:
To calculate questions like this, you need to make use of the equation below:
E = hν
E is the energy, h is Planck's constant, and ν is the frequency.
Also, another important formula you need for this question is the following:
ν = c / λ
ν is the frequency, c is the speed of light, and λ is the wavelength.
Therefore, E = hν = hc/λ.
Also remember to convert nm wavelength to meters.
To answer the question, E = hc/λ = ((6.626*10^-34 J•s)(3*10^8 m/s))/(4.45*10-7 m) = 4.42 • 10^-19 J = A
Of the following substances, only______ has London dispersion forces as the only
intermolecular force.
HCI
O Kr
O CH3OH
NH3
O H₂S
Answers
Answer:
HCI
Explanation:
thats the sorrect one
brainly me bro pls pls
i need 4 brainly im willing to brainly me
would the water in a pond or the water in a full bathtub have more thermal energy? Explain why.
Answers
1. What is the nuclide symbol for an atom which has 43 protons, 55 neutrons and 39 electrons? (1) A. 98Tc++ B. 93Cs+ C. ABY D. 43Tct-
Answers
mass number = proton+neutron
mass number = 43+55 = 98
atomic number = proton = 43
charge = proton - electron = 43 - 39 = +4
symbol : ⁹⁸Tc⁺⁴
When all the atoms of particular type of matter are the same, the matter is a
Answers
Answer:
an element.
Explanation:
When all the atoms contain a nucleus with the same amount of protons then each atom is classified as the same element. Hence multiple atoms and a larger quantity of atoms of the same element is still just the same single element.
state the special characteristics of maxwell-boltzman statistics
Answers
Answer:
I need more info
Explanation:
how would the function of the galvanic cell be affected if the salt bridge contained a very diluted solution of NaNo3? explain
Answers
Answer:
The salt bridge serves to complete the electrical circuit in the galvanic cell. It is pertinent that the salt bridge ions are in high concentrations as this allows electron mobility and keeps each half cell electronically neutral. The diluted salt bridge wuld cause a buildup of positive charge in the anode and negative charge in the cathode and the electrode half reactions which either reduce or oxidise species would halt. Causing the cell to stop producing electronic energy, impedeing the proper functioning of the galvanic cell.
In order to maintain a sodium chloride (NaCl) concentration similar to ocean water, an aquarium must contain 4.7 g NaCl per 100 g of water. What is the percent by mass of NaCl in the solution?
Answers
Answer:
0.047
Explanation:
mass percent is part/whole mass
Substances in a fire extinguisher help prevent air from reaching a burning material. Why would this be a good way to fight a fire?
Answers
Answer:
because of the substance contained in a fire extingudher it woulfnt start a fire.
Calculate the partial
pressure of argon in a
gas mixture with a total
pressure of 2.4 atm.
The partial pressures
of the other gases are:
O2 = 128.0 mmHg
He = 167.5 mmHg and
Ne= 760.0 mmHg
Answers
The required partial pressure of argon gas present in the mixture is 1.02 atm.
What is Dalton law of gas?Dalton's law of gas states that total pressure of any mixture of gas is sum of the partial pressure of all the gases present in that mixture.
Given that,
Total pressure of mixture = 2.4 atm
Partial pressure of argon = ?
Partial pressure of oxygen = 128 mmHg = 0.168 atm
Partial pressure of helium = 167.5 mmHg = 0.220 atm
Partial pressure of neon = 760 mmHg = 1 atm
On putting all these values according to the definition we get the partial pressure of argon gas as:
Partial pressure of argon = 2.4 - (0.168 + 0.22 + 1) = 1.02 atm
Hence required partial pressure of argon gas is 1.02 atm
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