Answer:
SO2 this is my answer
..wkkwks
Calculate the grams of solute in each of the following solution: 278 mL of 0.038 M Fe2(SO4)3
Answer: 4.22 grams of solute is there in 278 ml of 0.038 M [tex]Fe_2(SO_4)_3[/tex]
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n}{V_s}[/tex]
where,
n = moles of solute
[tex]V_s[/tex] = volume of solution in L
Now put all the given values in the formula of molality, we get
[tex]0.038M=\frac{n}{0.278L}[/tex]
[tex]n=0.0105mol[/tex]
mass of [tex]Fe_2(SO_4)_3[/tex] = [tex]moles\times {\text {Molar Mass}}=0.0105\times 399.88g/mol=4.22g[/tex]
Thus 4.22 grams of solute is there in 278 ml of 0.038 M [tex]Fe_2(SO_4)_3[/tex]
water from a town is suspected to contain chloride ions but not sulphate ions . describe how the presence of the chloride ions in the water can be shown
Answer:
See Explanation
Explanation:
We can establish that there are chloride ions present in water if we add dilute trioxonitrate V acid to a sample of the water in drops followed by aqueous silver trioxonitrate V.
If a white precipitate is observed and the precipitate is found to be soluble in excess aqueous ammonia solution, then we can confirm the presence of chloride ion in the water.
Determine the molecular formula for a compound with
an empirical formula of C2h8N and a molar mass of 46
grams per mole?
Answer:
C2H8N
Explanation:
Hello there!
In this case, since the molecular formula is the complete representation of the considered chemical compound and the empirical one is the smallest possible whole-numbered representation of the former, we infer that the ratio of the molar masses of these two provides the times in which the empirical formula is within the molecular one; for that reason, we first compute the molar mass of the empirical formula:
[tex]MM_{empirical}=12*2+8+14=46g/mol[/tex]
Thus, since the ratio is 46/46=1, we infer that the molecular formula is also C2H8N.
Best regards!
Is anyone good at chemistry if so can someone help me please ?
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Strong acid + strong base = neutral salt;
strong acid + weak base = acidic salt;
weak acid + strong base = basic salt;
weak acid + weak base = it depends on the relative strength of the acid and base.
1. NaOH is a strong base; CH3COOH is a weak acid. The resulting salt, CH3COONa, will be basic (b).
2. HBr is a strong acid; NH3 is a weak base. The resulting salt, NH4Br, will be acidic (c).
3. H2SO4 is a strong acid; Ca(OH)2 is a strong base. The resulting salt, CaSO4, will be neutral (a).
Biological membranes are selectively permeable, allowing certain molecules to cross the membrane, but not others. Classify the molecules or ions depending on how they cross a biological membrane. Note that some of these examples may also utilize active transport to traverse a membrane. However, this question is limited to passive transport processes only. Match the followings with each others
a. Simple Diffusion
b. Facilitated Diffusion
1. steroid hormones
2. K+
3. N2
4. Glucose
Answer:
Following are the solution to these question:
Explanation:
Simple diffusion implies which molecules can move across a cell membrane instead of using the incorporated protein structure channels. Its flow of molecules across these canals is enabled by diffusion. It has steroid hormones and N2.
Facilitated diffusion of molecules via cell membranes, or active transportation, which would be the random mass transit process of molecules or ions via unique cellular membranes from the transmembrane. It has K+ and Glucose.
5. Element X exists as diatomic molecules.
In which group of the Periodic
Table is X placed?
A. Group O
B.
Group I
C.
Group II
D.
Group VII
Element X Exists as diatomic molecules . In which group of the Periodic Table is X placed ?
Group VII
Group VII - elements are Fluorine , Chlorine , Bromine and Iodine .
They exist in diatomic molecules as F2 , Cl2 , Br2 and I2 .
Which substance has the highest ph?
A. Tomato
B. Unpolluted rainwater
C. Ammonium hydroxide
D. Orange juice
Answer:
c ammonium hydroxide nh4oh has higher ph value and its a base
plz mark me branliest
Answer:
c) ammonium hydroxide
Explanation:
ammonium hydroxide nh4oh has higher ph value, and it is an alkaline
How many moles are in 4.28 x 1023 atoms of carbon?
0.711 moles C
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableMolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 4.28 × 10²³ atoms C
[Solve] moles C
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 4.28 \cdot 10^{23} \ atoms \ C(\frac{1 \ mol \ C}{6.022 \cdot 10^{23} \ atoms \ C})[/tex][DA] Divide [Cancel out units]: [tex]\displaystyle 0.710727 \ moles \ C[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
0.710727 moles C ≈ 0.711 moles C
Question 4 point
CH2-CO-THEO
149.65 mole of methane reacts with oxygen to produce carbon dioxide and water, what mass of water is produced
174 gram
425 gram
343 gram
-154 gram
Answer:
[tex]5393.4gH_2O[/tex]
Explanation:
Hello there!
In this case, for the described chemical reaction, we can write:
[tex]CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]
Thus, by considering the 1:2 mole ratio of methane to water, and the molar mass of the latter (18.02 g/mol), the following is useful to calculate the mass of water that is produced:
[tex]149.65molCH_4*\frac{2molH_2O}{1molCH_4} *\frac{18.02gH_2O}{1molH_2O}[/tex]
Which is equal to:
[tex]5393.4gH_2O[/tex]
Which is not among the choices.
Regards!
When the temperature is 23C, a bottle of gas has a pressure of 5.5atm.Assuming that the volume of the balloon remains constant, what will the
pressure be if the temperature is decreased to 18C?
Answer:
use the formula pressure 1 ÷ temperature 1 = pressure 2 ÷ temp 2
so your equation would look like this,
p2= p1(T2)÷ T1
so p2 =5.5(18)÷23
so it would be 4.304347826
round as you must
How might the population of grasshoppers be affected if the population of owl were to suddenly decrease
Answer:
the population of grasshoppers would rise since there is less owls to eat them.
Explanation:
hope this helps
2-methyl-2-butene + hydrogen chloride
This is an electrophilic addition of a hydrogen halide to an alkene.
The pi bond is attacked by the electrophilic H⁺ from the H⁺Cl⁻, resulting in the loss of the double bond and the formation of a tertiary carbocation on C2. A less stable carbocation intermediate with the positive charge on C3 is also formed.
The nucleophilic Cl⁻ then attacks the carbocations, forming the haloalkane products. The major product will be 2-chloro-2-methybutane, where the Cl is bonded to the most substituted C (Markovnikov's rule). The minor product, if you have to worry about it, will be 2-chloro-3-methylbutane. The major product has no stereoisomers to worry about as it's achiral.
The attached image shows the scheme of this reaction. Only the major product is shown.
how can two rocks made by the same process be so different in color
Answer: Although the rocks of the produced by similar processes but their chemical composition may vary dependent upon the type of mineral present in these rocks so the color of the rock also varies depending upon the mineral composition.
Explanation:
The rocks are made by basic steps like disintegration of parent rock material, erosion, crystallization, metamorphism, and sedimentation. These basic steps are common in same kind of rocks but their color may vary because of the mineral composition in them for example, Rhyolite is of light colored because of the presence of quartz mineral present in it.
Hhheppppp fffaaast
Mixture of water and LEAD SULPHATE is an example of Homogeneous mixture Select one : True O False
Answer:
False
Explanation:
Lead sulfate is insoluble in water and sinks in water
(sorry if it's wrong)
2A (g) + Y (g) <-- --> 3C (g) + D (g)
Based on the initial conditions shown below, determine the value of the equilibrium constant if the concentration of product C at equilibrium was measured to be 0.456 M.
Initial Conditions: No reactants present, [C] = 0.651 M, [D] = 0.754 M.
Equilibrium Conditions: [A] = ?, [Y] = ?, [C] = 0.456 M, [D] = ?.
A. K = 59.5
B. K = 37.2
C. K = 0.0269
D. K = 0.0168
Answer:
A. K = 59.5
Explanation:
Hello there!
In this case, since this reaction seems to start moving leftwards due to the fact that neither A nor Y are present at equilibrium, we should rewrite the equation:
3C (g) + D (g) <-- --> 2A (g) + Y (g)
Thus, the equilibrium expression is:
[tex]K^{left}=\frac{[A]^2[Y]}{[C]^3[D]}[/tex]
Next, according to an ICE table for this reaction, we find that:
[tex][A]=2x[/tex]
[tex][Y]=x[/tex]
[tex][C]=0.651M-3x[/tex]
[tex][D]=0.754M-x[/tex]
Whereas x is calculated by knowing that the [C] at equilibrium is 0.456M; thus:
[tex]x=\frac{0.651-0.456}{3} =0.065M[/tex]
Next, we compute the rest of the concentrations:
[tex][A]=2(0.065M)=0.13M[/tex]
[tex][Y]=0.065M[/tex]
[tex][D]=0.754M-0.065M=0.689M[/tex]
Thus, the equilibrium constant for the leftwards reaction is:
[tex]K^{left}=\frac{(0.13M)^2(0.065M)}{(0.456M)^3(0.689M)}=0.0168[/tex]
Nonetheless, we need the equilibrium reaction for the rightwards reaction; thus, we take the inverse to get:
[tex]K^{right}=\frac{1}{0.0168}=59.5[/tex]
Therefore, the answer would be A. K = 59.5.
Regards!
Help for number 9 Please!
Answer:
A..............................
Please please help :/
Answer:
eliptical
Explanation:
what are the two changes of state occurs during distillation
Answer:
The changes of state occur during distillation are boiling followed by condensation. The liquid is converted into its vapor phase at its boiling point and the vapor is then condensed back to liquid on cooling.
Explanation:
Heart me pls
When a thermometer is heated, the red liquid inside the thermometer moves up. This is mainly because:
A. The red liquid is thin.
B. The molecules of the liquid move faster and get a little further apart.
C. Hot liquid is lighter.
D. The glass of the thermometer gets hot.
The thermometers with red liquid usually depicts a kerosene based column with red dye. It is more safe than mercury thermometer. The red liquid inside the thermometer moves up due to the molecules of the liquid move faster and get a little further apart. The correct option is B.
What is thermometer?The device which is used to measure the temperature is defined as the thermometer. It can measure the temperature of a solid such as food, a liquid like water and a gas like air.
The thermometers which are developed for clinical purposes are called clinical thermometers. It can also measure the temperature of human body. It is a long narrow glass tube which contain a bulb and consists of mercury at the end.
When a thermometer is heated, the molecules present in the liquid inside the thermometer get a little further apart. Because the liquid takes up more space. So the red line moves up in the tube.
Thus the correct option is B.
To know more about thermometer, visit;
https://brainly.com/question/28034450
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In a titration of nitrous acid with NaOH, the pH of the solution is 3.14 when the moles of HNO2 and the moles of NO2-- are equal. What is the Ka of nitrous acid?
Answer:
[tex]Ka=3.98x10^{-4}[/tex]
Explanation:
Hello there!
In this case, since the modelling of titration problems can be approached via the Henderson-Hasselbach equation to set up a relationship between pH, pKa and the concentration of the acid and its conjugate base, we can write:
[tex]pH=pKa+log(\frac{[NO_2^-]}{[HNO_2]} )[/tex]
Whereas the pH is given as 3.14 and the concentrations are the same, that is why the pH would be equal to the pKa as the logarithm gets 0 (log(1)=0); thus, we can calculate the Ka via:
[tex]Ka=10^{-pKa}=10^{-3.14}\\\\Ka=3.98x10^{-4}[/tex]
Best regards!
Which material is likely to slow the flow of electric charges the most? Explain.
Answer:
copper hiiiiiiiiiiiii
Calculate the pH of a solution with [H+]=1.45x10-10 . Is the solution acidic or basic
Answer:
So basicly it is basic
Explanation:
Take the -logarithm of the concentration of hydrogen ions that are in the solution: pH=−log(1×10−8M)=8. Therefore, the pH of the solution is 8
Given the balanced equation representing a reaction
occurring at 101.3kPa and 298K:
2H2 + O2 + 2H2O + 571.6kJ
What is the total amount of energy released when
0.75mol of H2O is produces?
1) 214.4 kJ
3) 285.8 kJ
2) 428.7 kJ
4) 571.6 kJ
The percentage composition of a compound expresses the
amount (by weight) of constituent elements in of the
compound
Answer:
The percentage composition of a compound expresses how much of each element is in the compound.
A cheetah has been clocked at 112 km/h over a 100-m distance. What is this speed in m/s?
balance Fe+Cl2>FeCl3
Answer:
Explanation:
Fe + Cl2 ===> Fe Cl3 Make the Cls equal to a common denominatorFe + Cl2 ===> 2 FeCl3 There are 6 Cls on the rightFe + 3Cl2 ===> 2 FeCl3 Put a 2 in front of the Fe on the left2Fe + 3Cl2 ===> 2 FeCl3 And it is balanced.11 D. Organism 4 When Charles Darwin observed finches on the Galapagos Islands, he noted differences in the shapes of birds' beaks. redeater bexl, Leal, and fruit estet Ceci este Soalanxei celer A 0 If there is a two-year drought that kills off many seed and fruit plants, which finch species have traits that could make them more successful? A. A and B B. A and C C. B and C D. C and D
What is the density at STP of the gas sulfur hexafluoride, SF6?
O 3.93 x 1024 g/L
O 0.153 g/L
O 6.52 g/L
O 3270 g/L
Answer:
Explanation:
There is a formula for this:
M = DRT/P where M = molar mass. This just derived from PV = nRT where you say n = grams/molar mass. However, just with this formula, we can get D which is density at STP (1 atm and 273K). We find that D = 6.52g/L.
The 4-4-9 system is used to estimate the number of _______ in food. Question 9 options: A) kilojoules B) calories C) joules D) nutritional Calories
Answer: B) calories
Explanation:
The 4-4-9 system is used to estimate the number of calories in food. Under this system, it is assumed that one gram of Protein, one gram of Carbohydrates and one gram of Fats each contribute 4, 4 and 9 calories respectively to the caloric total.
This means that to find out the number of calories in food, multiply the total grams of proteins by 4, the total grams of carbohydrates by 4 and the total grams of Fats by 9 and then add up the results to find out the caloric contribution of Protein, Carbohydrates and Fats.
Answer:
It's not C calories i put that and missed it
Explanation:
Two gases helium and x are released from one end of an evacuated long cylinder at the same time if it takes helium atoms 3 times faster than gas X to effuse from one end. What is gas X?
Answer:
Hypoflorous acid, HOF
Explanation:
From the question, we're told that the helium atoms effuses 3 times than the said gas X.
We can determine the rate of effusion by using the formula
r is inversely proportional to 1/√M, where M is the molecular mass of the gas.
And also,
r is inversely proportional to 1/t, where t is the time taken for effusion.
From both formulas I listed, we can conclude that t is directly proportional to √M. And thus we proceed.
The molecular mass of Helium is 4.
tHe = tX/3, where tx is the time taken for the unknown gas X
As of yet, we don't know the molecular mass of X. Next, we say that
tX/tHe =√Mx/MHe
3 = √Mx/4
If we square both the sides, to remove the square root, we have
9 = Mx/4
Mx = 36
The molecular mass of the unknown gas X is 36.