Answer:
Formula: Na2S2O3
we get solubility.
Divide the mass of the compound by the mass of the solvent and then multiply by 100 g to calculate the solubility in g/100g .
Solution given:
mass of sodium thiosulphate [m1]=25.5g
mass of water [m2]=40g
at temperature [t]=25°C
we have
solubility in g/dm^3 :[tex] \frac{solute in gram}{solvent in gram} *100[/tex]
=[tex] \frac{25.5}{40}*100 [/tex]=63.75g /litre=63.75g/dm³solubility in g/dm^3 :63.75g/dm³
now
solubility of the solute in mol/dm^3=:63.75g/dm³/178=0.4 mol/dm³
HURRY PLEASE
What volume is occupied by 3.12 moles of a gas when the pressure is 88.4 kPa at a temperature of 19℃?
Answer:
The Combined Gas Law shows that the pressure of a gas is inversely proportional to volume and directly proportional to temperature. Avogadro's Law shows that volume or pressure is directly proportional to the number of moles of gas. Putting these together leaves us with the following equation:
P1×V1T1×n1=P2×V2T2×n2(11.9.1)
As with the other gas laws, we can also say that (P×V)(T×n) is equal to a constant. The constant can be evaluated provided that the gas being described is considered to be ideal.
The Ideal Gas Law is a single equation which relates the pressure, volume, temperature, and number of moles of an ideal gas. If we substitute in the variable R for the constant, the equation becomes:
P×VT×n=R(11.9.2)
The Ideal Gas Law is conveniently rearranged to look this way, with the multiplication signs omitted:
PV=nRT(11.9.3)
The variable R in the equation is called the ideal gas constant.
Explanation:
What is caffeine atomic number?
No links
Answer:
Caffeine has no atomic number
Explanation:
Caffeine is a compound, not an element. Therefore it cannot have an atomic number.
The name for the process that causes fertile land to become dirt-like is??
Deforestation
Urbanization
Construction
Desertification
Answer:
Desertification?
Explanation:
Desertification is when fertile lands become desert like
7. When a log is thrown on a fire it seems to lose weight; what happens to its physical mass?
a. It disappears
b. It is released into the air
C.
It becomes energy
d. The log does not change weight or size
Answer:I think it would be D.
Explanation:The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant.
what does molecule mean?
a.) A pure substance, only one type of atom
b.) Two or more atoms held together by chemical bonds
c.)Composed of two or more separate elements
d.)The smallest part of matter still retaining chemical properties
A pure substance, only one type of atom
Answer:
(a) a pure substance, only one type of atom
If the half-life of a decaying isotope is 10 years, which statement is true after
20 years?
Answer:
A. There are more daughter nuclei than parent nuclei in a sample.
Explanation:
There are more daughter nuclei than parent nuclei in a sample. Hence, option A is correct.
What is half-life?The half-life of a radioactive element or isotope is the time taken for half of the substance to decay.
If the half-life of a decaying isotope is 10 years, after 8 years, less than the total mass of the original isotope will decay since 8 years is less than 10 years.
Therefore, we can conclude that, if the half-life of a decaying isotope is 10 years, after 8 years, there will be more parent nuclei than daughter nuclei in a sample.
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A 45.2 g sample of Silver at 101.0 ºC is dropped into 300.0 g of water at 30.6 ºC. What is the final temperature of the water?
Answer:
Final temperature of water = 31.2° C
Explanation:
Let the final temperature of water be T degrees
Concept: By energy conservation law
Heat lost by the silver = heat gained by water
Heat lost be silver Q1 = m1c1ΔT1
Q1 = 45.2/1000Kg×2.36J/KgK×(101-T)
Heat gained by water Q2 = m2c2ΔT2
Q2 = 300/1000Kg×4.186J/KgK(T-30.6)
Since, Q1=Q2
⇒ 45.2/1000Kg×2.36J/KgK×(101-T) = 300/1000Kg×4.186J/KgK(T-30.6)
Solving we get T = 31.2° C
Therefore, final temperature of water = 31.2° C
What is the best explanation for the fact that Styrofoam will not dissolve in water, but Styrofoam will dissolve in acetone?
1.styrofoam is polar and water is nonpolar
2.styrofoam is nonpolar and water is polar
3.Styrofoam is polar and water is polar
4.styrofoam is nonpolar and water is nonpolar
what is the chemical formula for zinc?
What is the pH of a solution that contains 0.009 grams of oxalic acid in 100
mL of water?
Answer:
pH = 3.0 ya that's it......
What is the name of this hydrocarbon?
Answer:
2,3-dimetylpentane
Explanation:
.....................
1.Peptide bond formation is accomplished as the amine nitrogen of the an-tRNA in the ____ carries out a _____ of the amino acid bound to the _____. a.A site, nucleophilic attack on the carbonyl carbon, tRNA of the P site b.P site, nucleophilic attack on the carbonyl carbon, tRNA of the A site c.A site, acidophilic attack on the carbonyl carbon, tRNA of the P site d.A site, electrophilic attack on the carbonyl carbon, tRNA of the P site e.P site, electrophilic attack on the carbonyl carbon, tRNA of the A site
Answer:
A
Explanation:
A site, nucleophilic attack on the carbonyl carbon, tRNA of the P site
What is the number of moles of Sodium Chloride (NaCl) that is present in 29.22g sample of it?
Answer:
[tex]\boxed {\boxed {\sf 0.5000 \ mol \ NaCl}}[/tex]
Explanation:
We are asked to convert grams to moles. We must use the molar mass or the grams in 1 mole of a substance. These values are found on the Periodic Table as the atomic mass, but the units are grams per mole (g/mol) instead of atomic mass units (amu).
We are given the compound sodium chloride or NaCl. Look up the molar masses of the individual elements.
Na: 22.9897693 g/mol Cl: 35.45 g/molThe formula for the compound does not contain any subscripts, so there is 1 mole of each element in 1 mole of the compound. Add the molar masses together to find sodium chloride's molar mass.
NaCl: 22.9897693 + 35.45= 58.4397693 g/molNow we can use the molar mass to create a ratio. We know there are 58.4397693 grams of NaCl in 1 mole of NaCl.
[tex]\frac {58.4397693 \ g \ NaCl}{ 1 \ mol \ NaCl}[/tex]
Multiply by the number of grams provided in the problem: 29.22
[tex]29.22 \ g\ NaCl*\frac {58.4397693 \ g \ NaCl}{ 1 \ mol \ NaCl}[/tex]
Flip the ratio so the units of grams of NaCl cancel.
[tex]29.22 \ g\ NaCl*\frac { 1 \ mol \ NaCl}{58.4397693 \ g \ NaCl}[/tex]
[tex]29.22*\frac { 1 \ mol \ NaCl}{58.4397693}[/tex]
[tex]\frac {29.22}{58.4397693} \ mol \ NaCl[/tex]
[tex]0.5000019738 \ mol \ NaCl[/tex]
The original measurement of grams has 4 significant figures, so our answer must have the same. For our answer, that is the ten-thousandth place. The 0 to the right of this place (0.5000019738) tells us to leave the 0 in the ten-thousandth place.
[tex]0.5000 \ mol \ NaCl[/tex]
There are approximately 0.5000 moles of sodium chloride in a 29.22 gram sample of sodium chloride.
the 3 factors that affect the process of Natural Selection
Answer:
Overproduction of Offspring. The first of these factors that must be present in order for Natural Selection to occur is the ability of a population to overproduce offspring.
Variation.
Selection.
Reproduction of Adaptations.
Explanation:
Which of the following can be used to measure an object's
speed?
Answer:
distance traveled divided by the time it traveled
Explanation
this is just an equation for how to find speed. you can also just use like a meterstick and a stopwatch
2.28 Global Warming’s Negative Effects Worksheet
Watch this Video and to answer the following questions.
What type of human activity increases the amount of CO2 in the atmosphere?
Explain how climate change affects our oceans
Explain how climate change affects our weather
Explain how climate change affects our food
Explain how climate change affects our health
What can we do to prevent the negative effects of climate change?
PLEASE ANSWER ASAP GIVE BRAINLIEST
Jaclyn's coffee was too hot to drink so she placed the cup in the freezer for 10 minutes. What did Jaclyn know about heat that caused her to take this action?
Answer:
Jaclyn knew that Hot temperatures are cooled when out into a colder area.
A rarefraction is generated when particles move
A:together
B.closer
C.under
D.apart
What mass of potassium would need 2350 J of energy in order to raise its temperature from 44.3°C to 57.8°C? (cpotassium = 0.753 J/g°C)
Answer:
Explanation:
q = mCΔT
m =CΔT/q
ΔT = 57.8°C - 44.3°C = 13.5°C
m = (0.753*13.5)/2350
m = 0.00433 g
The mass of potassium that will need 2350 J of energy in order to raise its temperature from 44.3°C to 57.8°C is 231.17 g
Data obtained from the question Heat (Q) = 2350 JInitial temperature (T₁) = 44.3 °CFinal temperature of water (T₂) = 57.8 °CChange in temperature (ΔT) = 57.8 – 44.3 = 13.5 °C Specific heat capacity (C) = 0.753 J/gºC Mass (M) =?Q = MCΔT
2350 = M × 0.753 × 13.5
2350 = M × 10.1655
Divide both side by 10.1655
M = 2350 / 10.1655
M = 231.17 g
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7. Which type of electromagnetic radiation can be dangerous to living things?
a. Radio waves
b. Visible light
c. Gamma rays
what is chemical bonding?
Answer:
Chemical bonding - a mutual adhesion of atoms in an molecule and the crystal lattice.
Explanation:
Hope you have a great day
A compound contains 1.2 g of carbon, 3.2 g of oxygen and 0.2g of hydrogen. Find the formula of the compound
Answer:
The empirical formula of the compound is [tex]C_{0.504}HO_{1.008}[/tex].
Explanation:
We need to determine the empirical formula in its simplest form, where hydrogen ([tex]H[/tex]) is scaled up to a mole, since it has the molar mass, and both carbon ([tex]C[/tex]) and oxygen ([tex]O[/tex]) are also scaled up in the same magnitude. The empirical formula is of the form:
[tex]C_{x}HO_{y}[/tex]
Where [tex]x[/tex], [tex]y[/tex] are the number of moles of the carbon and oxygen, respectively.
The scale factor ([tex]r[/tex]), no unit, is calculated by the following formula:
[tex]r = \frac{M_{H}}{m_{H}}[/tex] (1)
Where:
[tex]m_{H}[/tex] - Mass of hydrogen, in grams.
[tex]M_{H}[/tex] - Molar mass of hydrogen, in grams per mole.
If we know that [tex]M_{H} = 1.008\,\frac{g}{mol}[/tex] and [tex]m_{H} = 0.2\,g[/tex], then the scale factor is:
[tex]r = \frac{1.008}{0.2}[/tex]
[tex]r = 5.04[/tex]
The molar masses of carbon ([tex]M_{C}[/tex]) and oxygen ([tex]M_{O}[/tex]) are [tex]12.011\,\frac{g}{mol}[/tex] and [tex]15.999\,\frac{g}{mol}[/tex], then, the respective numbers of moles are: ([tex]r = 5.04[/tex], [tex]m_{C} = 1.2\,g[/tex], [tex]m_{O} = 3.2\,g[/tex])
Carbon
[tex]n_{C} = \frac{r\cdot m_{C}}{M_{C}}[/tex] (2)
[tex]n_{C} = \frac{(5.04)\cdot (1.2\,g)}{12.011\,\frac{g}{mol} }[/tex]
[tex]n_{C} = 0.504\,moles[/tex]
Oxygen
[tex]n_{O} = \frac{r\cdot m_{O}}{M_{O}}[/tex] (3)
[tex]n_{O} = \frac{(5.04)\cdot (3.2\,g)}{15.999\,\frac{g}{mol} }[/tex]
[tex]n_{O} = 1.008\,moles[/tex]
Hence, the empirical formula of the compound is [tex]C_{0.504}HO_{1.008}[/tex].
A cylinder of hot gas with pressure of 2.81 atm is at 371°C. It is then
cooled to 85°C. What is the gas pressure at the lower temperature?
Help
Answer: 3.38 Atm is the partial ressure of each gas
Mark drove 14 miles EAST and then 23 miles WEST. His displacement from where he started would be
Answer:
9 miles west
Explanation:
hope this helps
When a solute is added to water, the boiling point
Answer:
Boiling-point elevation describes the phenomenon that the boiling point of a liquid (a solvent) will be higher when another compound is added, meaning that a solution has a higher boiling point than a pure solvent. This happens whenever a non-volatile solute, such as a salt, is added to a pure solvent, such as water.
Which correctly lists the 3 types of
radiation from least damaging to most
damaging?
alpha < beta < gamma
alpha < gamma < beta
gamma < beta < alpha
beta < gamma < alpha
Answer:
alpha < beta < gamma.
Explanation:
Electromagnetic waves is a propagating medium used in all communications device to transmit data (messages) from the device of the sender to the device of the receiver.
An electromagnetic spectrum refers to a range of frequency and wavelength that an electromagnetic wave is distributed or extends. The electromagnetic spectrum comprises of gamma rays, visible light, ultraviolet radiation, x-rays, radio waves, and infrared radiation.
Generally, all radioactive elements are capable of emitting radiation. The three (3) types of nuclear radiation from least damaging to most damaging are; alpha, beta and gamma.
This ultimately implies that, alpha particles have the least damaging (penetrative) ability followed by beta particles and lastly, gamma rays.
21. An object appears blue when seen in sunlight. The same object is illuminated by a mixture of equally bright red and green light. It is also viewed through a blue filter. What color does the object appear to be? A. Blue B. Cyan C. Black D. Green
Answer: Green.
Explanation: Because object appears to be blue in sunlight, it absorbs counter colour of blue, also orange-red colour. So, when illuminated with
red-green colour, red light is more absorbed and object appears to be green.
Mention any two uses of oxygen gas.
Answer:
steel, plastics
Explanation:Hope it helps!
If 10.5 g of iron, at 25°C, absorbs 128 J of heat, what will be the final temperature of metal? (The specific heat of iron is 0.449 J g-1 °C-1)
Answer:
27.5°C = Final Temperature of the metal
Explanation:
The change in temperature using the specific heat of a material could be obtained using the formula:
Q = m*S*ΔT
Where Q is heat absorbed in Joules = 128J in the problem
m is the mass of the substance = 10.5g
S is Specific Heat of the substance = 0.449J/g°C for Iron
ΔT is change in temperature = Final T - Initial T
Replacing:
128J = 10.5g*0.449J/g°C*ΔT
2.5°C = ΔT
2.5°C = Final T - 25°C
27.5°C = Final Temperature of the metal
The equilibrium of 2H2O(g) 2H2(g) + O2(g) at 2,000 K has a Keq value of 5.31 x 10-10. What is the Keq expression for this system?
A) [H2}^2[O2} / [H2O]^2
B) [H2][O2] / [H2O]
C) [H2O]^2 / [H2]^2[O2]
D) [H2O]^2 / [H2][O2]
Answer:
B
Explanation:
I don't know how to explain this but you get it