The value of 'a' is 7.9
Chemical equations - chemical equations are symbolic depictions of chemical reactions where the reactants and products are stated in terms of their respective chemical formulae.
Balancing of chemical equation is necessary because the law of conservation of mass states that during a chemical reaction, matter cannot be generated or destroyed. This is only conceivable if the total number of atoms on the reactants' and products' sides is identical. A chemical reaction should therefore always be in balance.
According to the given equation-
2a = 135 - 15a
2a + 15a = 135
17 a = 135
a = 135/ 17
a = 7.9
You can solve it by simply transferring the variables on one side and the constants on the other side. When you transfer -15 a on the left side it becomes =15a. now, 2a + 15 a is 17 a.
For taking out the value of 'a' simply divide 135 by 17.
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The OH-ion concentration of a blood sample is
2.5 x 10-7M. What is the pH of the blood?
a. 6.60
b.0.99
c.740
d.1
Answer:
She okeyy
Explanation:
Example 740 are the think free ofıce pH of the blood 740 blood sample iş takipte kal ❣️
calculate the number of atoms in 2.5 mol manganese.
Answer:
1.5 × 10²⁴ atoms Mn
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
2.5 mol Mn
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[tex]2.5 \ mol \ Mn(\frac{6.022 \cdot 10^{23} \ atoms \ Mn}{1 \ mol \ Mn} )[/tex] = 1.5055 × 10²⁴ atoms Mn
Step 4: Check
We are given 2 sig figs. Follow sig fig rules and round.
1.5055 × 10²⁴ atoms Mn ≈ 1.5 × 10²⁴ atoms Mn
Which of the following is a reactant?
Answer:
CH4 is a reactant
Explanation:
however 2o2 is also reactant but coefficient
Part A
If the theoretical yield of the reaction below corresponds to 99.2 g and the actual yield was 60.9 g, calculate the percent yield.
Given: Li2O + H202LiOH
20
Answer:
61.39%
Explanation:
The percent yield of a substance can be calculated using the formula:
Percent yield = actual yield/theoretical yield × 100%
Based on the information provided on the reaction in this question, the theoretical yield is given as 99.2g while the actual yield is given as 60.9g.
Hence, the percent yield is calculated thus:
% yield = 60.9/99.2 × 100
% yield = 0.6139 × 100
% yield = 61.39%
The percent yield is 61.39%
A student used a pipette to add 25.0 cm of KOH of unknown concentration to
a conical flask.
The student carried out a titration experiment to find the volume of 0.150 mol/dmº
H2SO4 needed to neutralise the KOH.
The student found that, on average, 17.20 cm of the H2SO4 solution was
required for neutralisation.
Calculate the concentration of the KOH solution.
The concentration of the KOH solution = 0.2064 M
Further explanationTitration is a procedure for determining the concentration of a solution (analyte) by reacting with another solution whose known concentration (usually a standard solution) is called the titrant. Determination of the endpoint/equivalence point of the reaction can use indicators according to the appropriate pH range
Acid-base titration formula
Ma Va. na = Mb. Vb. nb
Ma, Mb = acid base concentration
Va, Vb = acid base volume
na, nb = acid base valence (number of ions H+/OH-)
a=H₂SO4(valence = 2, H₂SO4⇒2H⁺+SO₄²⁻, 2 ions H⁺)
b=KOH(valence = 1, KOH⇒K⁺+OH⁻, 1 ion OH⁻)
Ma = 0.15 M
Va = 17.2 cm³
Vb=25 cm³
The concentration of the KOH(Mb) :
[tex]\tt 0.15\times 17.2\times 2=Mb\times 25\times 1\\\\Mb=0.2064[/tex]
Which of the statements are true ONLY for lonic compounds? (select all that apply)
Smallest unit is called a formula unit
Bonding determined by valence electrons and the octet rule
Compounds are electrically neutral (no charge) overall
Forms between a metal and a nonmetal
Compounds have relatively weak bonds
Creates geometrical shapes that minimize electron pair repulsion (VSPER model)
Forms between two non-metals
Formed by the transfer of electrons
Good conductor when dissolved in water
Formed when atoms share valence electrons
Smallest unit is a molecule
Forms repeating patterns in a crystal lattice structure
Have high melting and boiling points
Answer:
Smallest unit is called a formula unit
Forms between a metal and a nonmetal
Formed by the transfer of electrons
Good conductor when dissolved in water
Forms repeating patterns in a crystal lattice structure
Have high melting and boiling points
Explanation:
Why when we chew a minty pice of gum your mouth and tounge is cold when you suck in air and when you drink moderaters help!!!!!!!!!!!! ASAP!!!!!!!!!!!!!!!!!!!
if vegetable oils made of vegetables, and olive oils made of olives......whats baby oil made of?
ANSWER:
oil lol
EXPLANATION:
Answer:
Mineral oil, fragrance, aloe barbadensis leaf extract, tocopheryl acetate (vitamin E), water.
Explanation:
calculate the number of magnesium atoms in a 120.0g sample of forsterite mg2sio4. be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.
The number of magnesium atoms present in forsterite are 10.272 x 10²³
Equation :First we have to calculate the moles of magnesium
moles of forsterite = mass of forsterite / molecular mass of forsterite
moles of forsterite = 120.0 g / 140.69 g/mol
moles of forsterite = 0.8529 mole
Now we have to calculate the number of magnesium atoms
The formula of forsterite is mg2sio4
In the forsterite molecule, there 2 atoms of magnesium, 1 atoms of silicon and 4 atoms of oxygen.
As, 1 mole of forsterite contains 2 x 6.022 x 10²³ number of magnesium
So, 0.8529 mol of forsterite contains
= 0.8529 x 2 x 6.022 x 10²³
= 10.272 x 10²³ number of magnesium atoms
Therefore, the number of magnesium atoms present in forsterite are 10.272 x 10²³.
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why does a 30-kg barbell have more inertia than a 10-kg barbell
A 5 kilogram ball and a 10 kilogram ball are sitting on the edge of a wall. Which has more potential energy?
The 10 kilogram ball.
The 5 kilogram ball.
The have the same energy.
Answer:
The 10 kilogram ball
Explanation:
The name for the ionic compound CoHPO4
Answer:
Dicalcium phosphate. (I'm sure meant for the "o" to be an "a" for Calcium).
Explanation:
I hope this helps! :D Have a nice night!
gher ord inking skills type questions: If a compound gives hydrogen ion and chloride ion in the solution state,
Write name and molecular formula of the compound.
At normal temperature and pressure, hydrogen chloride (HCl), a gas composed of the element's hydrogen and chlorine, is a gas.
An aqueous solution of hydrogen chloride is what is known as hydrochloric acid, commonly referred to as muriatic acid. It has an unmistakably strong odor and is colorless. It is categorized as a powerful acid. In the digestive tracts of the majority of animal species, including humans, it is a part of the stomach acid. In the food, textile, metal, and rubber sectors, hydrogen chloride (HCl) is frequently employed as a bleaching agent to neutralize alkaline substances. When discharged into the soil, it is neutralized, and when it comes into contact with water, it hydrolyzes quickly.
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i need help with the je that asks which parent actually determines the sex the child
Answer:
Actually it is father who actually determine the sex of child
Explanation:
Because father has X & Y chromosome but mother has only XX chromosome. So it depends on which chromosome of father. If father's gamete has only x chromosome then the child will be female. And if the father's gamete has Y chromosome then the child will be male.
please mark me brainliest and 5 star
Please help ..
What is the molarity of a 0.30-liter solution containing 0.50 moles of H2SO4?
A 1.7M
B 0.6M
C 0.8M
D 0.15M
Answer:
1.7M
Explanation:
Given parameters:
Volume of solution = 0.3L
Number of moles = 0.5moles
Unknown:
Molarity = ?
Solution:
The molarity of a substance is the number of moles of solute that can be found in the volume of a solution.
Molarity = [tex]\frac{number of moles }{volume}[/tex]
Insert the parameters and solve;
Molarity = [tex]\frac{0.5}{0.3}[/tex] = 1.7M
use the term reclamation in a sentence
Answer:
Explanation:
The increase of the arable land has been affected partly by the reclamation of the marshes, but mostly by the transformation of large tracts of the puszta
An example of a reclamation is how landfill employees sift through garbage to find usable items. An example of a reclamation is trees growing on land that was heavily logged.
70% of rubbing alcohol is made up of water & alcohol that is used as antiseptic and disinfectant. Which of the following is the solute?
a. 30 parts alcohol
b. 70 parts water
c. 30 parts water
d. 70 parts alcohol
Answer:
choose a. 30 parts alcohol
2. A gas that has a volume of 28 liters, a ternperature of 45 °C, and an unknown
pressure has its volume increased to 34 iters and its temperature decreased to
35 °C. If I measure the pressure after the change to be 2.0 atm, what was the
original pressure of the gas?
The original pressure of the gas : 2.507 atm
Further explanationBoyle's law and Gay Lussac's law
[tex]\tt \dfrac{P_1.V_1}{T_1}=\dfrac{P_2.V_2}{T_2}[/tex]
P1 = initial gas pressure (N/m² or Pa)
V1 = initial gas volume (m³)
P2 = final gas pressure
V2 = final gas volume
T1 = initial gas temperature (K)
T2 = final gas temperature
V₁=28 L
T₁=45+273=318 K
P₂=2 atm
V₂=34 L
T₂=35+273=308 K
then initial pressure :
[tex]\tt P_1=\dfrac{P_2.V_2.T_1}{V_1.T_2}\\\\P_1=\dfrac{2\times 34\times 318}{28\times 308}\\\\P_1=2.507~atm[/tex]
What type of soil is best for growing plants?
In 2018, Micah Williams, of Benson High School, set the Oregon High School State Track meet record in the 100 meter dash by posting a time of 10.42 seconds. What was his average speed?
Answer:
Average speed = 9.59 m/s
Explanation:
Given data:
Distance = 100 m
Time taken = 10.42 s
Average speed = ?
Solution:
Formula:
Average speed = distance covered / time taken
by putting values,
Average speed = 100 m / 10.42 s
Average speed = 9.59 m/s
ASAP please and Thankyou
in a particular gravimetric analysis, the precipitate of barium sulfate was weighed before it was completely dried. the likely impact of this error on the calculated result is...
The result is a higher result than the correct value.
Gravimetric analysis describes a set of methods used in analytical chemistry for the quantitative determination of an analyte based on its mass. The principle of this type of analysis is that once an ion's mass has been determined as a unique compound, that known measurement can then be used to determine the same analyte's mass in a mixture, as long as the relative quantities of the other constituents are known.
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How do the number of protons, rumber of neutrons, and the mass number relate to each other
Answer:
Protons are the atomic number and for each element they never change.
Electrons are equal to the atomic number unless it is an Ion (Positive charge means it has less negative means it has more)
Mass number is Protons+Nuetrons
Explanation:
Josh prepares a solution by mixing sodium nitrate and water. To calculate the molarity of the solution, Josh should calculate the moles of which substance, and why?
sodium nitrate, because it is the solvent
sodium nitrate, because it is the solute
water, because it is the solvent
water, because it is the solute
Answer:
sodium nitrate, because it is the solute
Explanation:
To find the molarity of the solution, Josh should determine the number of moles of the sodium nitrate.
Molarity is defined as the number of moles of solutes in a given volume of solution.
Molarity = [tex]\frac{n}{v}[/tex]
n is the number of moles of solute
v is the volume of solution
Answer:
C: sodium nitrate, because it is the solute
Explanation:
The membrane of the egg I like the cell membranes because
1-calculate the mass of 4 moles of Na
2-what is the mass of 0.3 moles of water H2o H:1 O:16
3-compute the number of moles found in 10g of ethanol C2H5OH C:12 O:16
please help me as fast you can
1. 92 g
2. 5.4 g
3. 0.217 moles
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
[tex]\tt n=\dfrac{m}{MW}[/tex]
1. the mass of 4 moles of Na(MW= 23 g/mol)
[tex]\tt mass=mol\times MW\\\\mass=4\times 23\\\\mass=92~g[/tex]
2. the mass of 0.3 moles of water(MW=18 g/mol)
[tex]\tt mass=mol\times MW\\\\mass=0.3\times 18\\\\mass=5.4~g[/tex]
3. the number of moles found in 10g of ethanol C2H5OH(MW=46 g/mol) :
[tex]\tt mol=\dfrac{10}{46}\\\\mol=0.217[/tex]
Rashid belays net worth
(b) largest radius: S, CI, P
Answer:
P
Explanation:
radius decreases as you go from left to right
Write the name of Co4(SiO4)3
Answer:
Copper siliconquadoxide
Explanation:
how many molecules are in 2.5 mol of NaCl?
(a) 1.51×10^24
(b) 146
(c) 1.51×10^23
(d) 4.15
Answer:
1.51 x 10²⁴molecules
Explanation:
Given parameters:
Number of moles of NaCl = 2.5moles
Unknown:
Number of molecules = ?
Solution:
The number of molecules that can be found in a given mole is given as the Avogadro's constant;
1 mole of substance = 6.02 x 10²³ molecules
2.5 mole of NaCl = 2.5 x 6.02 x 10²³ molecules
= 1.51 x 10²⁴molecules