Answer:
Explanation:
So,at STP or NTP, one mole of any gas occupies 22.4 litres of volume. To find mass,firstly we have to calculate the no. Of moles present in 11.2 litres of O2 gas which can be calculated as ;
No. Of moles = Given Volume ÷ 22.4 Litre (provided that gas is at STP)
= 11.2 Litre / 22.4 Litre
= 0.5 moles
Now, mass can be calculated by;
Mass = no. Of moles × Molecular mass
= 0.5 × 32 (Molecular mass of O2 is 32u or 32 g, if you are calculating in Grams, also called Gram Molecular Mass)
= 16 g
This is the answer
If a small amount of a strong base is added to buffer made up of a weak acid, HA, and the sodium salt of its conjugate base, NaA, the pH of the buffer solution does not change appreciably because:__________
a. the K, of HA is changed.
b. No reaction occurs.
c. the strong base reacts with A to give HA, which is a weak acid.
d. the strong base reacts with HA to give AOH and H'.
e. the strong base reacts with HA to give A, which is a weak base,
Answer:
e. the strong base reacts with HA to give A, which is a weak base
Explanation:
Let's consider a buffer made up of a weak acid, HA, and the sodium salt of its conjugate base, NaA. The function is a buffer system is to muffle the change in the pH when an acid or a base is added.
Let's suppose a strong base is added. Then, OH⁻ would be more available. OH⁻ ions react with the acid component of the buffer and its effect is reduced. The corresponding reaction is:
OH⁻ + HA ⇄ A⁻ + H₂O
As we can see, the strong base reacts with HA to give A, which is a weak base.
he specific heat capacity of a pure substance can be found by dividing the heat needed to change the temperature of a sample of the substance by the mass of the sample and by the change in temperature. The heat capacity of a certain substance has been measured to be
Complete question is;
The specific heat capacity of a pure substance can be found by dividing the heat needed to change the temperature of a sample of the substance by the mass of the sample and by the change in temperature. The specific heat capacity of a certain substance has been measured to be 3.52 J/g°C. Suppose 420.0 g of the substance is heated until the temperature of the sample has changed by 43.8 °C.
Write an equation that will let you calculate the last Q that was needed for this temperature change. Your equation should contain only symbols. Be sure to define each symbol.
Answer:
Q = m•c•Δt
Q = 64753.92 J
Explanation:
We are given;
Mass (m) = 420 g
Change in temperature; (Δt) = 43.8 °C
Specific heat capacity (c) = 3.52 J/g °C
The last Q is simply the heat energy that caused that temperature change.
This is given by the formula;
Q = m•c•Δt
Plugging in the relevant values;
Q = 420 × 3.52 × 43.8
Q = 64753.92 J
Given the following information, calculate the density in g/mL of an irregular solid.
Mass of weighing vessel 1.005g
Mass of solid + weighing vessel 9.441g
Volume of liquid in graduated cylinder 3.45 mL
Volume of liquid in graduated cylinder + volume of solid 5.45 mL
Answer:
4.22 g/mL
Explanation:
First we calculate the mass of the solid via mass difference:
Mass of solid = 9.441 g - 1.005 g = 8.436 gThen we calculate the volume of the solid, once again by difference:
Volume of solid = 5.45 mL - 3.45 mL = 2.00 mLFinally we calculate the density in g/mL:
Density = 8.436 g / 2.00 mL = 4.22 g/mLThe density of an irregular solid will be "4.96 g/mL".
According to the question,
→ The Mass of solid will be:
= [tex][(Mass \ of \ solid+ Weighing \ vessel)-(Mass \ of \ weighing)][/tex]
By substituting the values, we get
= [tex]9.441-1.005[/tex]
= [tex]8.436 \ g[/tex]
→ The Volume of solid will be:
= [tex][(Volume \ of \ liquid \ in \ grad. \ cylinder+Solid)-(Volume \ of \ grad. \ cylinder)][/tex]
= [tex]5.15 - 3.45[/tex]
= [tex]1.70 \ mL[/tex]
hence,
→ The density of irregular solid will be:
= [tex]\frac{Mass}{Volume}[/tex]
= [tex]\frac{8.436}{1.70}[/tex]
= [tex]4.96 \ mL[/tex]
Thus the above is the correct answer.
Learn more:
https://brainly.com/question/1150199
Draw the structure of the major organic product isolated from the reaction of 3-hexyne with hydrogen (1 mol), Lindlar palladium.
Answer:
See explanation and image attached
Explanation:
When 1 mole of hydrogen is added to 3-hexyne, the addition occurs on the same face or side of the triple bond to yield cis-2-hexene in the presence of lindlar catalyst which prevents further hydrogenation. This is known as syn addition.
The syn addition is achieved because the hydrogen molecule is first adsorbed on the surface of the palladium metal and is subsequently attached to the same face of the triple bond in 3-hexyne as shown in the image attached to this answer.
Element X contains 4 electrons in its outer shell and 125 neutrons in its nucleus. what is element X? (beryllium/carbon/tin/lead)
Answer:
lead
Explanation:
As it is in group 4 so 4 electron In its outer shell
and you can find number of neutrons by taking
mass number - atomic number
207.2-82=124.2=125
hope it make sense:)
34. Which type of reaction is represented by the
equation?
CH. + Biz - CH.Br + HB,
A suhstitution
C. esterification
D. polymerization
Answer:
Option A. Substitution
Explanation:
To know which option is correct, let us define each option. This is illustrated below:
A substitution reaction is a reaction in which an halogen replaces hydrogen in a hydrocarbon to produce alkyl halide and the corresponding acid. For example:
RH + X₂ –> RX + HX
NOTE:
R => is an alkyl group
X => is an halogen (F₂, Cl₂, Br₂ or I₂)
Addition reaction is a reaction in which two reactants combined to form a new compound without any loss of the reactants. This reaction is peculiar to only unsaturated hydrocarbon. For example:
CₓHᵧ + A₂ —> ACₓHᵧA
NOTE:
CₓHᵧ => unsaturated hydrocarbon (alkene, alkyne)
A₂ => halogen (F₂, Cl₂, Br₂ or I₂) or HBr, HCl etc
Esterification is a reaction involving carbonxylic and alcohol to produce ester and water. For example:
RCOOH + HOR —> RCOOR + H₂O
NOTE:
R => is an alkyl group
Polymerization is a process of reacting smaller molecules called monomers to form a larger molecule called polymer.
With the information provided above, we can see that the reaction:
CH₄ + Br₂ —> CH₃Br + HBr
Is a substitution reaction since Br replaces H in CH₄ to produce CH₃Br and the corresponding acid i.e HBr
Helppppp
What is the mass of 4.09 x 10^22 molecules of oxygen gas?
1.09 grams
7.69 x 1044 grams
2.17 grams
0.0679 gram
Answer:
[tex]2.17gO_2[/tex]
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to calculate the mass of 4.09 x 10^22 molecules of oxygen gas by firstly keeping in mind that that 1 mole of it has a mass of 32.0 g and secondly that 1 mole of any substance contains 6.022x10^23 representative units, in this case, molecules of O2, and thus, the appropriate setup to perform this conversion is shown below:
[tex]4.09x10^{22}molecules \ O_2*\frac{1molO_2}{6.022x10^{23}molecules \ O_2}*\frac{32.0gO_2}{1molO_2} \\\\2.17gO_2[/tex]
Regards!
What’s the correct answer
Answer:
I think it's 2-methylhept-2-ene
Explanation:
Hope this will help and correct me if I'm wrong.
Write the reaction of maleic acid with Br2
Which of the following numbers is in scientific notation?
A~ 13.5 x 10^14
B~ 1.35 x 10^14
C~ 1.35 x 9^14
D~ 13.5 x 9^14
If a swimming pool contains 2850 kg liters of water how many gallons of water does it contain
PLS HELP ME WILL MARK YOU AS BRAINLIEST
Answer:
D
Explanation:
If a light beam strikes a shiny object at a 90-degree angle, to what are the angle of incidence and the angle of reflection equal?
Answer:
Angle of incidence = angle of reflection = 0
Explanation:
Given that,
A light beam strikes a shiny object at a 90-degree angle.
The angle made by incident ray and normal to the mirror is called the angle of incidence and the angle made by the reflected ray and the normal is called the angle of reflection.
Here, the beam strikes normally. So, the angle of incidence is 0.
A/c to the law of reflection,
Angle of incidence = angle of reflection
So, the angle of reflection is also equal to 0.
calculate to e amount of ammonium chloride needed to produce 200L of hydrogen chloride (HCL) gas at 1.22atm and 573k. NH4Cl ➡️NH3+HCl
Answer:
277.8g of NH4Cl are needed
Explanation:
Based on the reaction, 1mol of NH4Cl reacts producing 1 mole of HCl. To solve this question we must find the moles of HCl using ideal gas law. These moles = Moles NH4Cl:
Moles HCl = Moles NH4Cl
PV = nRT; PV/RT = n
Where P is pressure = 1.22atm,
V is volume = 200L,
R is gas constant = 0.082atmL/molK
And T is absolute temperature = 573K
Replacing:
1.22atm*200L/0.082atmL/molK*573K = n
n = 5.193 moles HCl = Moles NH4Cl
Mass NH4Cl -Molar mass: 53.491g/mol-
5.193 moles * (53.491g / mol) =
277.8g of NH4Cl are neededHow many liters of water would you need to add to 4.36 moles of NaCl to create a 9.4 M solution?
Answer:
0.464 L
Explanation:
Molarity (M) = number moles (n) ÷ volume (V)
According to the information given in this question:
number of moles (n) = 4.36 moles
Molarity = 9.4M
Volume = ?
Using M = n/V
9.4 = 4.36/V
9.4V = 4.36
V = 4.36/9.4
V = 0.464 L
Hence, 0.464L of water are needed the volume of water.
what happens to the volume of a gas if the pressure and temperature doubled
Hi there! Answer is below :)
Explanation:
For this question, we apply Boyle's Law and Charles' Law.
When you double the amount of pressure and temperature of a compound or mixture, the volume will decrease by a half. So, if the pressure and temperature are 2, and the volume is 1, and you double, your volume will be 0.5 and your pressure and temperature will be 4.
Best of Luck!
Which type of macromolecule carries genetic information from parents to
their children?
A. Nucleic acids
B. Carbohydrates
C. Proteins
D. Lipids
Answer: Its A nucleic acids
Explanation:
Nucleic acids, and DNA in particular, are key macromolecules for the continuity of life. DNA bears the hereditary information that's passed on from parents to children, providing instructions for how (and when) to make the many proteins needed to build and maintain functioning cells, tissues, and organisms.
Nucleic acids carry genetic information from parents to their children.
What are Nucleic acids?Nucleic acids are biopolymers, macromolecules, essential to all known forms of life.[1] They are composed of nucleotides, which are the monomers made of three components: a 5-carbon sugar, a phosphate group and a nitrogenous base. The two main classes of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). If the sugar is ribose, the polymer is RNA; if the sugar is the ribose derivative deoxyribose, the polymer is DNA.
Nucleic acids are naturally occurring chemical compounds that serve as the primary information-carrying molecules in cells and make up the genetic material. Nucleic acids are found in abundance in all living things, where they create, encode, and then store information of every living cell of every life-form on Earth. In turn, they function to transmit and express that information inside and outside the cell nucleus to the interior operations of the cell and ultimately to the next generation of each living organism. The encoded information is contained and conveyed via the nucleic acid sequence, which provides the 'ladder-step' ordering of nucleotides within the molecules of RNA and DNA. They play an especially important role in directing protein synthesis.
Learn more about Nucleic acids
https://brainly.com/question/2488520
#SPJ2
If 12.5 grams of Hydrogen and 5.14 grams of Oxygen react in a container what would be the excess leftovers? Thanks! :)
Answer:
Explanation:
The reaction is 2H2 + O2 -> 2 H2O
So the molar ratio of H2 and O2 is 2:1
No. of moles of H2 = 12.5/2 = 6.25
No. of moles of O2 = 5.14/32 =0.16
As 6.25 > 0.16*2 = 0.32
there will be H2 leftovers of 6.25-0.32 = 5.93 moles or 11.86 grams
Answer:
Explanation:
2 H2 + 1 O2 => 2 H2O
molecular wt of H2 = 2
molecular wt of O2 = 32
so wt of H2 : wt of O2 = 2x2 : 16 = 4 : 16 = 1 : 4
there are way more H2 as 12.5 > 5.14/4 = 1.285
H2 leftovers = 12.5 - 1.285 = 11.215 gram
How much of a 3.75 M KI solution would you need to prepare 252.5 mL of a 0.780 M KI solution?
HCl(aq) and KOH(aq) Express your answer as a balanced chemical equation. Identify all of the phases in your answer.
Answer:
HCl(aq) + KOH(aq)---------->KCl (aq)+ H2O(l)
2
Drag the tiles to the correct locations on the equation. Not all tiles will be used.
Two atoms interact with each other as shown by the equation. Complete the equation by filling in the missing parts.
1
2
3
4
5
5
H
le
Li
?H + He -
+
TH
H
Reset
Next
Answer:
4 on the top
He in the middle
2 on the bottom
Explanation:
Correct on plato
The missing of the part of the chemical equation when the two atoms interact is Helium with mass number 4 and atomic number 2.
What is interaction of the two atoms?The two atoms interact with each other as shown by the equation below;
[tex]^4_2He[/tex]
where;
He is Helium atom4 is the mass number of the helium atom2 is the atomic number of the helium atom.Thus, the missing of the part of the chemical equation when the two atoms interact is Helium with mass number 4 and atomic number 2.
Learn more about helium atom here: https://brainly.com/question/26226232
#SPJ5
respiration of rabbit
Answer:
A rabbits respiration should be 30-60 breaths per minute
Suppose 0.879 g of ammonia reacts with 28.5 mL of a hypobromite solution. Calculate the concentration of the hypobromite solution.
Answer:
0.877 M
Explanation:
Number of moles of ammonia = 0.879 g /17 g/mol = 0.05 moles
The reaction equation is ;
2NH3 + OBr-→ N2H4 + Br- + H2O
2 moles of NH3 reacts with 1 mole of hypobromite
0.05 moles of NH3 reacts with 0.05 moles ×1 mole/2 moles
= 0.025 moles
Number of moles = concentration × volume
Concentration = Number of moles / volume
Concentration = 0.025 moles × 1000/28.5
Concentration = 0.877 M
help pls I'll give you briliantest by tomorrow 11:59pm pls no links
Answer:
It's sunset because the sun sets in the west and rises in the east. The shadow is going west therefore the sun must be in the east. Also the shadow is super long meaning the sun has to be close to the horizon.
Explanation:
How many moles of lithium nitrate are theoretically produced if we start with 3.0 moles of Ca(NO3)2 and 3.0 moles of Li3PO4? Reaction: 3Ca(NO3)2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4)2
Answer:
6.0 mol LiNO₃
Explanation:
3Ca(NO₃)₂ + 2Li₃PO₄ → 6LiNO₃ + Ca₃(PO₄)₂First we need to determine which reactant is the limiting reactant:
We calculate with how many Ca(NO₃)₂ moles would 3.0 moles of Li₃PO₄ react, using the stoichiometric coefficients of the reaction:
3.0 mol Li₃PO₄ * [tex]\frac{3molCa(NO_3)_2}{2molLi_3PO_4}[/tex] = 4.5 mol Ca(NO₃)₂There are not as many Ca(NO₃)₂ moles, so Ca(NO₃)₂ is the limiting reactant.
Using the number of moles of the limiting reactant, we calculate how many moles of LiNO₃ would be formed:
3.0 mol Ca(NO₃)₂ * [tex]\frac{6molLiNO_3}{3molCa(NO_3)_2}[/tex] = 6.0 mol LiNO₃At about what age does basal metabolic rate begin to gradually decrease?
15
25
30
45
Answer:
at age 15 the BMR begin to gradually decrease
True or False: There are more genes on
Earth today than ever before.
Answer:
true
Explanation:
because scientist are discovering new things everyday.
Answer:đúng nhé người ae
Explanation:
Calculate the pKa of hypochlorous acid (HClO, a weak acid). A 0.015 M solution of hypochlorous acid has a pH of 4.64.
Answer:
"7.46" is the correct answer.
Explanation:
Given that:
[tex]pH=4.64[/tex]
[tex]C=0.015 \ M[/tex]
The equation:
⇒ [tex]HA \rightleftharpoons H^++A^-[/tex]
HA = C - Cα
H⁺ = Cα
A⁻ = Cα
now,
⇒ [tex]pH=-log(H^+)[/tex]
[tex]=-log(C \alpha)[/tex]
[tex]=4.64[/tex]
[tex]C \alpha = 2.3\times 10^-5 \ M[/tex]
As we know,
⇒ [tex]K_a=C \alpha^2[/tex]
[tex]=(\frac{C \alpha}{C} )^2\times C[/tex]
[tex]=\frac{(2.3\times 10^{-5})^2}{0.015}[/tex]
[tex]=3.5\times 10^{-8}[/tex]
hence,
⇒ [tex]pK_a=-log(K_a)[/tex]
[tex]=7.46[/tex]
pls help !!!!!!!!!!!!!!!!
Answer:
Definitely A.
Explanation:
very hot...................
A fungicide was used to kill the mushrooms in a
lawn. Some mushrooms were not affected by the
fungicide. The resistant mushrooms reproduced.
The resistance of some of the mushrooms to the
fungicide was
Answer: a
Explanation: