Answer:
Explanation:Reaction NaHCO3 + HCl ⇒ NaCl + H2O + CO2
Molar mass M = (22.99+1.008+ 12.01+3·16 ) g/mol. Calculate
Amount of substance n =m/M, n(NaCl) is equal.
M(NaCl) = 58.44 g/mol and mass m= n·M
A sample contains 0.1895 g of salt per 50 g of seawater. What is its salinity?
How many moles are in 6.5e23 atoms of Ne?
1.1 mol Ne
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
MolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 6.5 × 10²³ atoms Ne
[Solve] moles Ne
Step 2: Identify Conversion
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 6.5 \cdot 10^{23} \ atoms \ Ne(\frac{1 \ mol \ Ne}{6.022 \cdot 10^{23} \ atoms \ Ne})[/tex][DA] Divide [Cancel out units]: [tex]\displaystyle 1.07938 \ mol \ Ne[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
1.07938 mol Ne ≈ 1.1 mol Ne
A 15 g sample of steam at 100°C is emitted from a volcano. It condenses, cools, and falls as snow at 0°C. How many kilojoules of heat were released? [Specific heat of liquid water = 1.00 cal/g°C or 4.184 J/g°C); solid water 0.485 cal/g°C or 2.03 J/g°C]
Answer:
q= -40.236 or 40.236 KJ of heat released
Explanation:
I attached a picture + a cooling curve.
How many Protons, Electrons and Neutrons does Calcium-36 have?
Answer:
Calcium is the 20th element, with 20 protons. Since a stable atom has a net charge of 0, we must have 20 electrons. The number of neutrons will be the same as the number of protons, or else we will have an isotope, in this case, it is also 20.
Explanation:
What would happen if cell differentiation did not happen during the
development of the embryo?
Answer:
Without the process of cell differentiation, multicellular organisms would not be possible.
Which of the following can limit the growth of a population of organisms?
O Both diseases and the availability of resources can limit the growth of a population of organisms.
Diseases can limit the growth of a population of organisms, but the availability of resources cannot.
O The availability of resources can limit the growth of a population of organisms, but diseases cannot.
O Neither diseases nor the availability of resources can limit the growth of a population of organisms.
Answer: The answer is both diseases and availability of resources can limit the growth of a population of organisms which is A
Explanation:
which part of the red blood cells can you find hemoglobin
Answer:
The cytoplasm of erythrocytes is rich in hemoglobin, an iron-containing biomolecule that can bind oxygen and is responsible for the red color of the cells and the blood. Each human red blood cell contains approximately 270 million of these hemoglobin molecules.
The total oxide ion charge in a formula unit of Mn2O3 is 6-. What is the charge on each manganese ion ?
Answer:
Mn= +3 charge
Explanation:
if you take what we know, and that would be the charge of oxygen, we know that oxygen has a 2- charge and there are 3 sets of O^2- so multiply the number of oxygen times the charge and you get 6-.
Next set up an equation as listed in the picture which will be 2(x)=6
and that is the charge of the Mn ion.
What is the mass of 2.18 mol of Cu?
139 g Cu
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 TableMolesStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 2.18 mol Cu
[Solve] grams Cu
Step 2: Identify Conversion
[PT] Molar Mass of Cu - 63.55 g/mol
Step 3: Convert
[DA] Set up: [tex]\displaystyle 2.18 \ mol \ Cu(\frac{63.55 \ g \ Cu}{1 \ mol \ Cu})[/tex][DA] Multiply [Cancel out units]: [tex]\displaystyle 138.539 \ mol \ Cu[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
138.539 g Cu ≈ 139 g Cu
What type of energy is a light switch
1.thermal
2.sound
3.light
4.electrical
5.mechanical
Answer:
electrical
Explanation:
With electrical energy, it's helpful to think of an on/off switch. When the switch is off, the electrical energy is stored as potential energy. When the switch is on, electrical energy is being used as kinetic energy.
How many microliters are in 41.0 mL
Answer:
41000 is the answer
The amount of microliters in 41.0 mL is 41,000 microliters
How to find the volume in microlitersTo convert milliliters (mL) to microliters (µL), you need to multiply the value in milliliters by 1000 because there are 1000 microliters in 1 milliliter.
So, to convert 41.0 mL to microliters:
41.0 mL * 1000 = 41,000 µL
Therefore, there are 41,000 microliters in 41.0 mL.
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What are some differences between earth and mars
Oki,
1. Earth is third planet away from the Sun whiles Mars is the fourth planet away from the Sun.
2.. Earth takes 365 days to revolve around the Sun whiles Mars takes 687 days to do so.
3. Earth is the fifth largest planet in the Solar System whiles Mars is the second smallest planet.
4. Mars is reddish in colour but Earth is not
5. About 70% of the earth is covered with water but Mars is just covered with bare dust and rocks.
Hope this is enough
Calculate the value of the equilibrium constant, c, for the reaction
Q(g)+X(g)=2M(g)+N(g)
given that
M(g)=Z(g) c1=3.97
6R(g)=2N(g)+4Z(g) c2=0.523
3X(g)+3Q(g)=9R(g) c3=11.8
Question is asking for c
What is the mole fraction of oxygen in a gaseous mixture containing 25 grams of oxygen, 15 grams of nitrogen, and 10 grams of helium?
The statement, that describes the mole fraction of oxygen is "0.20."
What is mole fraction?The mole fraction, often known as the molar fraction, is defined in chemistry as the amount of a constituent, nᵢ, divided by the total amount of all constituents in a mixture, nₜₒₜ. It denotes the number of moles of a certain component in the solution divided by the total number of moles in the solution.
In order to calculate the mole fraction, initially the moles of the substance to be calculated from the given mass.
Gram to mole conversion,
[tex]=Grams\;*\;\frac{1\;mol}{grams} \\Moles of O2,25\;g\;*\;\frac{1\;mol}{32\;g}\;=\;0.78\;mol\;O2\\Moles of N215\;g\;*\;\frac{1\;mol}{28.02\;g}\;=\;0.54\;mol\;O2\\Moles of He10\;g\;*\;\frac{1\;mol}{4.0\;g}\;=\;2.5\;mol\;He[/tex]
Now, adding all the moles of gases0.78 + 0.54 + 2.5 = 3.82 moles.
Mole fraction of oxygen comes out to be,
[tex]Mole\; fraction\;=\frac{Amount \;of\;the\;substance}\\{Total\;moles} \\Mole\;fraction\;=\frac{0.78\;mol\;O2}{3.82 \;mol} =0.204.[/tex]
Hence the correct answer is 0.20.
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A student claims that signals transmitted by wireless computer networks are more beneficial than signals transmitted by other devices. Which statement supports the student’s claim?
im giving brainliest and 11 points
Answer: The wireless signals can carry large amounts of data at high radio frequencies.
Explanation: the others don’t specify the kind of signal
gas laws escape room
Answer:
what are you asking
Explanation:
The gas laws are Boyle's law, Charles law, ideal gas law, and Gay-Lussac law.
What are the different gas laws?The first law is Boyle's law that states that at constant temperature, the pressure varies with volume of the gas.
The second law is Charles's law that states that at constant pressure, the volume of the gas is directly proportional to the temperature of the gas.
Above, both laws form the ideal gas law. PV = nRT.
Thus, the gas laws are Boyle's law, Charles law, ideal gas law, and Gay-Lussac law.
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What are the 5 common uses of fossil fuels?
Answer:
Electricity. Coal alone provides half the electricity in the United States. ...
Heating. Oil and natural gas are commonly used for heating homes as well as providing heat for industrial applications.
Transportation. Oil supplies 99 percent of the energy for cars in the form of gasoline and diesel. ...
Limits. ...
Considerations.
Explanation:
Somebody help me asap please giving brainliest (answer to the both of them)
Answer:
1. Causes air to vibrate 2. A hydroelectric dam generating electricity on a river
type of environmental factors such as temperature or amount of light that might affect an organism's phenotype is___________
What volume in L of a 0.724 M Nal solution contains 0.405 mol of Nal?
Answer:
0.559 L
Explanation:
Step 1: Given data
Moles of sodium iodide (n): 0.405 molMolar concentration of sodium iodide (M): 0.724 M (0.724 mol/L)Step 2: Calculate the volume of solution (V)
The molarity is equal to the moles of solute divided by the liters of solution.
M = n/V
V = n/M
V = 0.405 mol/(0.724 mol/L) = 0.559 L
The volume in Litres of a 0.724 M Nal solution that contains 0.405 mol of Nal is 0.56L.
HOW TO CALCULATE VOLUME:
The volume of a solution can be calculated by dividing the number of moles by the molarity as follows:Volume = no. of moles ÷ molarityAccording to this question, 0.724 M sodium iodide (NaI) solution contains 0.405 mol of Nal, the volume can be calculated as follows:Volume = 0.405mol ÷ 0.724MVolume = 0.56 LitresTherefore, the volume in Litres of a 0.724 M Nal solution that contains 0.405 mol of Nal is 0.56L.Learn more at: https://brainly.com/question/15626439?referrer=searchResults
A paleontologist finds a fish fossil in a desert. What might the paleontologist learn from this?
Answer:
sometime back there might be a water body there
Answer:
Paleontologists can identify organisms that may be ancient relatives of those living today. By looking at fossils from the same layer of rocks, they can also suggest how these organisms lived together in their ancient habitat.
Also, he/she can find out that there was water there millions of year ago.
type of environmental factors such as the presence of a hormone that might affect an organism's phenotype is __________
about the door is locked and I think I have a few questions about the door is locked and I think I have
Explanation:
can you tell me what the door is locked and I think I have a few questions about the door is locked and I think I have a few questions
2NaN3 produces 2Na+3N2 How many moles of each product are produced when 6 moles of NaN3 react?
Answer:
[tex]6molNa\\\\9molN_2[/tex]
Explanation:
Hello there!
In this case, given the chemical reaction:
[tex]2NaN_3\rightarrow 2Na+3N2[/tex]
It is possible to evidence the 2:2 mole ratio of the reactant to Na and the 2:3 mole ratio of the reactant to the N2; therefore, the following setups allows us to compute the moles of products:
[tex]6molNaN_3*\frac{2molNa}{2molNaN_3}=6molNa\\\\6molNaN_3*\frac{3molN_2}{2molNaN_3}=9molN_2[/tex]
Best regards!
4. How many moles of gold (Au) are in a pure gold nugget having a mass of 25.0 grams.
0.127 mol Au
General Formulas and Concepts:Math
Order of Operations: BPEMDAS
BracketsParenthesisExponentsMultiplicationDivisionAdditionSubtractionLeft to RightChemistry
Atomic Structure
Reading a Periodic TableMolesStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 25.0 g Au
[Solve] moles Au
Step 2: Identify Conversions
[PT] Molar Mass of Au - 196.97 g/mol
Step 3: Convert
[DA] Set up: [tex]\displaystyle 25.0 \ g \ Au(\frac{1 \ mol \ Au}{196.97 \ g \ Au})[/tex][DA] Multiply/Divide [Cancel out units: [tex]\displaystyle 0.126923 \ mol \ Au[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
0.126923 mol Au ≈ 0.127 mol Au
Answer:
[tex]\boxed {\boxed {\sf 0.127 \ mol \ Au}}[/tex]
Explanation:
To convert from mass to moles, the molar mass must be used. This can be found on the Periodic Table.
Gold (Au): 196.96657 g/molUse this number as a ratio.
[tex]\frac {196.96657 \ g\ Au }{1 \ mol \ Au}[/tex]
Multiply by the given number of grams.
[tex]25.0 \ g \ Au*\frac {196.96657 \ g\ Au }{1 \ mol \ Au}[/tex]
Flip the fraction so the grams of gold will cancel.
[tex]25.0 \ g \ Au*\frac {1 \ mol \ Au}{196.96657 \ g\ Au }[/tex]
[tex]25.0*\frac {1 \ mol \ Au}{196.96657 }[/tex]
[tex]\frac {25.0 \ mol \ Au}{196.96657 }[/tex]
[tex]0.1269250919 \ mol \ Au[/tex]
The original measurement has 3 significant figures, so the answer must have the same. For the number we calculated that is the thousandth place. The 9 in the ten thousandth place tells us to round the 6 to a 7.
[tex]0.127 \ mol \ Au[/tex]
25.0 grams of gold is about 0.127 moles of gold.
A certain electromagnetic wave a wavelength of 415 nm. What is the frequency of the wave in hz?
Answer:
The frequency of the electromagnetic wave is 7.22891566 × 10¹⁴ Hz
Explanation:
The wavelength of the electromagnetic wave, λ = 415 nm
The speed of an electromagnetic wave, c ≈ 3.0 × 10⁸ m/s
Given that an electromagnetic wave is a periodic wave, we have;
The speed of the electromagnetic wave, c = f×λ
Where;
f = The frequency of the electromagnetic wave
Therefore, we have;
f = c/λ
From which we have;
f = (3.0 × 10⁸ m/s)/(415 nm) = 7.22891566 × 10¹⁴ /s = 7.22891566 × 10¹⁴ Hz
The frequency of the electromagnetic wave, f = 7.22891566 × 10¹⁴ Hz
help help plz what is the difference between normal and transition elements
Answer:
hope it helps you
mark me as brainliest!!
A wave is a disturbance that carries...
What type of energy relates to the movement of objects or its position in gravity ?
•electrical
•thermal
•light
•nuclear
•sound
•chemical
•mechanical
Answer:
Thermal creo que esa es[tex]ayudaaaaa [/tex]in which of the following aqueous solutions would you expect AgCl to have the HIGHEST solubility?a) Pure Waterb) 0.015 M NaClc) 0.020 M AgNO3d) 0.020 M KCle) 0.020 M BaCl2
Answer:
Pure Water
Explanation:
The common ion effect describes the effect on equilibrium that occurs when a common ion (an ion that is already contained in the solution) is added to a solution. The common ion effect generally decreases solubility of a solute(Khan Academy).
NaCl, AgNO3, KCl, BaCl2 solutions all have a common ion with AgCl. As a result of this, AgCl will be much less soluble in these solvents than it is in pure water.
Therefore, AgCl will have the highest solubility in pure water compared to all the solutions listed above.
Pleaaase argent !!! Explain ur answers
Consider the following reaction:
Fe3+(aq) + SCN-(aq) ↔︎ [Fe(SCN)]2-(aq)
1)Explain what is meant by the term dynamic equilibrium.
2)Write the equilibrium expression for the reaction.
3) The numerical value of Kc at 298K is about 1000 for the reaction. What does this tell you about the position of the equilibrium at 298K?
Answer:
1. Dynamic equilibrium is a equilibrium in which the rate of forward direction is equal to the rate of backward direction. It is represented by a right left arrow.
2) Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as [tex]K_c[/tex]
For the given chemical reaction:
[tex]Fe^{3+}(aq)+SCN^-(aq)\rightleftharpoons [Fe(SCN)]^{2-}(aq)[/tex]
The expression for [tex]K_c[/tex] is written as:
[tex]K_c=\frac{[[Fe(SCN)]^{2-}]}{[Fe^{3+}][SCN^-]}[/tex]
3) The value of [tex]K_c[/tex] is 1000 , which means the products are more favoured as compared to reactants and that the equilibrium lies more towards product side.