Answer:
That the isotope H-1 is the most abundant in nature.
Explanation:
Hello!
In this case, since the average atomic mass of an element is computed considering the mass of each isotope and the percent abundance each, for hydrogen we would set up something like this:
[tex]m_H=m_{H_1}*\%abund_{H_1}+m_{H_2}*\%abund_{H_2}[/tex]
Moreover, since the isotope notation H-1 and H-2 means that the atomic mass of H-1 is 1 amu, that of H-2 is 2 amu and the average one is 1.0079 amu, we can infer that the most of the hydrogen in nature is H-1 as the most of it composes the average hydrogen atom.
Best regards!
Please help me with this
Answer:
D
Explanation:
compound 1 probably ether and compound 3 1-bromo ethane have 2 carbon atoms
Air will expand about the same amount as propane with the same change in temperature over ordinary temperature ranges.
Answer:
Yes this is true
Explanation:
Answer:
i have the same question for chemistry, do you have the answer?
Explanation:
What is mineral deficiency linked to
Answer:
Mineral deficiencies can lead to a variety of health problems, such as weak bones, fatigue, or a decreased immune system.
Explanation:
There are five main categories of mineral deficiency: calcium, iron, magnesium, potassium, and zinc.
One major cause of mineral deficiency is simply not getting enough essential minerals from food or supplements.
Answer:
it can lead to a variety of health problems, such as weak bones, or a decreased immune system.
Explanation:
Cells are the basic unit of life true or false
Calculate the number of molecules in 0.5 mol of sulfur dioxide, SO2.
Describe what is meant by a mole of sodium atoms. I need answers ASAP
We know, 1 mole of any element/compound contains 6.022 × 10²³ atoms/molecules .
Now, we have to calculate the number of molecules in 0.5 mole of sulfur dioxide, SO₂.
So, number of molecules of SO₂ in 0.5 mole is :
[tex]n = 0.5\times 6.022\times 10^{23}\\\\n = 3.011\times 10^{23}[/tex]
Therefore, number of molecules in 0.5 mole of SO₂ is 3.011 × 10²³.
pleaseeeeeee helpppppppppp
Answer:It is number 4
Explanation:
When (R)-6-bromo-2,6-dimethylnonane is dissolved in CH3OH, nucleophilic substitution yields an optically inactive solution. When the isomeric halide (R)-2-bromo-2,5- dimethylnonane is dissolved in CH3OH under the same conditions, nucleophilic substitution forms an optically active solution. Draw the products formed in each reaction, and explain why the difference in optical activity is observed.
Answer:
See explanation
Explanation:
The nucleophile here is CH3OH. We know that CH3OH is a good nucleophile that promotes SN2 reanction. However, (R)-6-bromo-2,6-dimethylnonane is a tertiary alkyl halide so the reaction proceeds by SN1 mechanism. This means that a racemic mixture is obtained at the end of the reaction because the attack occurs at the stereogenic carbon atom (6R) hence the product is optically inactive.
On the other hand, when (5R)-2-bromo-2,5-dimethylnonane is reacted with CH3OH, an optically active product is obtained because; though a tertiary alkyl halide and reaction occurs by SN1 mechanism, the attack does not occur at the stereogenic carbon atom (5R). Therefore, an optically active product is obtained in this case.
If a solution has equal numbers of hydronium
and hydroxide ions, what is its pH?
ANSWER NOWW PLS I NEED HELP
Answer:
neutral!
pH = 7
Explanation:
⁄(⁄ ⁄•⁄ω⁄•⁄ ⁄)⁄
Please help immediately it’s due today
Consider the procedures in a simple experiment used to demonstrate the behavior of gases
1 Remove the end cap from the tip of a 35-ml plastic syringe.
2. Remove plunger from the syringe and insert a balloon into the syringe,
3. Place plunger back in syringe so the volume reading is approximately at the 15-mi mark
4. Using a finger, seal the the syringe,
5. Pull the plunger out
Select ALL of the statements that help to explain what occurs once the plunger is pulled out.
A)
The pressure inside the balloon increases
B)
The pressure inside the syringe chamber decreases
C)
The lower pressure on the balloon causes its volume to increase
D)
When the syringe plunger is pulled out, the amount of gas increases,
E)
When the syringe plunger is pulled out, the volume of the chamber
increases
Answer:
B, C, E
Explanation:
did usatestprep
When the plunger is pulled out, pressure inside syringe decreases, lower pressure on balloon causes volume to increase,volume of the chamber also increases.
What is pressure?Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.
There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .
It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.
Learn more about pressure,here:
https://brainly.com/question/18107358
#SPJ5
Name of this compound:
S3P2
Answer:
sodium phosphide
Explanation:
How many molecules are contained in 103.4g of sulfuric acid?
1.827 × 10²⁴ molecules H₂S
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Compounds
Writing CompoundsAcids/BasesAtomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
103.4 g H₂S (Sulfuric Acid)
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of H - 1.01 g/mol
Molar Mass of S - 32.07 g/mol
Molar Mass of H₂S - 2(1.01) + 32.07 = 34.09 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 103.4 \ g \ H_2S(\frac{1 \ mol \ H_2S}{34.09 \ g \ H_2S})(\frac{6.022 \cdot 10^{23} \ molecules \ H_2S}{1 \ mol \ H_2S})[/tex]Multiply: [tex]\displaystyle 1.82656 \cdot 10^{24} \ molecules \ H_2S[/tex]Step 4: Check
Follow sig fig rules and round. We are given 4 sig figs.
1.82656 × 10²⁴ molecules H₂S ≈ 1.827 × 10²⁴ molecules H₂S
Choose the correct statement for this question: If two objects have different temperatures, in which direction will heat move? For how long?
1. Heat moves from hot to cold objects/areas, and it never stops.
2. Heat moves from cold to hot object/areas.
3.Heat moves from hot objects/areas to cold areas and stops moving once it reaches a thermal equilibrium.
Uranium-238 undergoes radioactive decay according to the incomplete below. 238
92
U= 4
2 He + X.
What is the decay product represented by X?
The decay product represented by X : Thorium (Th) : ²³⁴₉₀Th
Further explanationGiven
Decay reaction
²³⁸₉₂U ⇒ ⁴₂He + X
Required
The decay product
Solution
Radioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles,
alpha α particles ₂He⁴ beta β ₋₁e⁰ particles gamma particles ₀γ⁰ positron particles ₁e⁰ neutron ₀n¹In a decay reaction, the sum of the mass number and atomic number of the elements in the reactants and products must be the same
So the mass number of the element X = 238 - 4 = 234
Atomic number of the element X = 92 - 2 = 90
If we look at the periodic system, then the element with atomic number 90 is Thorium (Th)
Please help if you know please and thanks ;)
Answer:
it takes two hydrogen atoms for every oxygen atom to produce this reaction, so the mole ratio between hydrogen and oxygen is 2:1
Investigate: Note the empty jars on the shelf that can be filled by using the slider. Set the amount to 2.000 moles of carbon (mol C), then press Start. Each jar holds exactly one mole of carbon. Your goal is to determine the mass in grams of two moles of carbon. Before you can find the mass, what do you need to know
Answer:
The molar mass of carbon
Explanation:
Before the mass (in grams) of two moles of carbon can be determined, the molar mass of the element would be needed.
This is because the number of mole of an element is the ratio of its mass and the molar mass. That is,
number of mole = mass/molar mass
Hence, the mass of elements can be obtained by making it the subject of the formular;
mass = number of mole x molar mass
Therefore, the molar mass of carbon would be needed before the mass of 2 moles of the element can be determined.
how does heat transfer into conduction
Explanation:
Heat is transferred by conduction when adjacent atoms vibrate against one another or electrons move from one atom to another . Conduction is the most significant meanings of heat transfer within a solid or between solid objects informal contact.
How do we determine the central atom in a chemical bond? How information is need to determine the shape that results in the bonded atoms of the molecule?
Answer:
- the central atom is usually the atom with the lowest subscript in the molecular formula and the atom that can form the most bonds. If all of the atoms usually form the same number of bonds, the least electronegative atom is usually the central atom.
- molecular shape (the shape that a single molecule has) is important in determining how the molecule interacts and reacts with other molecules. Molecular shape also influences the boiling point and melting point of molecules. If all molecules were linear then life as we know it would not exist.
Construct your RNA chain from the following sequence of DNA: GGCTTACGGTAA.
The Answer to this question is CCGAAUGCCAUU
Answer:
GGCTTACGGTAA. = CCGAATGCCATT
Explanation:
.
Calculate the final pH of a solution made by the addition of 10 mL of a 0.5 M NaOH solution to 500 mL of a 0.4 M HA originally at pH
This question is not complete, the complete question is;
Calculate the final pH of a solution made by the addition of 10 mL of a 0.5 M NaOH solution to 500 mL of a 0.4 M HA originally at pH = 5.0 ( pKa = 5.0)
Neglect the volume change.
Options:
a) 6.10
b) 5.09
c) 7.00
d) 5.02
Answer:
the final pH of a solution is 5.02
Option d) 5.02 is the Correct Answer
Explanation:
Given the data in the question,
Initially pKa = pH; so ratio is 1:1
thus, 0.4 M acid and base
Now, moles of NaOH = molarity × volume = 0.5 × 10 = 5 mmol = 5 × 10⁻³ mol.
Going into 500 mL ( 0.5 L ) of solution
new molarity will be;
⇒ moles / volume = 5 × 10⁻³ / 0.5 = 0.01 M
ACID reacting with BASE
original concentration of acid = 0.4 - 0.01 = 0.39 M
original concentration of base = 0.4 + 0.01 = 0.41 M
so
pH = 5 + log( base/acid)
= 5 + log ( 0.41/0.39)
= 5 + log ( 1.0512)
= 5 + 0.021
pH = 5.02
Therefore the final pH of a solution is 5.02
Option d) 5.02 is the Correct Answer
If silicon has a charge of +4 and oxygen has a charge of -2, what is the total charge on this structure?
Answer:
Zero with the subscripts, +2 without them.
Explanation:
Hello!
In this case, since we consider that two silicon are bonded with four oxygen atoms to form silicon oxide according to the following chemical equation:
[tex]Si^{4+}+O^{2-}\rightarrow Si_2O_4[/tex]
It is also possible to realize it can be simplified to obtain:
[tex]SiO_2[/tex]
Which means that the total charge with the subscripts is zero, and without the subscripts +2 (+4-2).
Best regards!
What would be the mass of 9.03 x 1021 molecules of hydrobromic acid?
Answer:
[tex]1.214\ g[/tex]
Explanation:
[tex]We\ know\ that,\\No.\ of\ molecules\ of\ Hydrobromic\ acid=9.03*10^{21} HBr\ molecules\\Now,\\We\ know\ that\ Hydrobromic\ acid\ is\ constituted\ by\ 1\ Hydrogen\ molecule\\ and\ 1\ Bromine\ molecule.\\Gram\ Atomic\ Mass\ of\ Bromine \approx 80\ g\\Gram\ Atomic\ Mass\ of\ Hydrogen =1\ g\\Hence,\\The\ Gram\ Molecular\ Mass\ Of\ Hydrobromic\ Acid=1*1+1*80=81\ g\\Avagadro's\ Constant=6.022*10^{23}\ particles[/tex]
[tex]Now,\\We\ know\ that,\\Mass=\frac{No.\ of\ particles}{Avagadro's\ Constant}*GMM\\Here,\\Mass\ of\ 9.03*10^{21} molecules\ of\ HBr= \frac{9.03*10^{21}}{6.022*10^{23}}*81 \approx 1.214\ g[/tex]
What is the formula for this
ionic crystal?
The ionic formula for the ionic crystal is Fe₃O₂
Ionic crystals are solid, crystalline ionic substances that are made up of ions linked together in a regular lattice structure by electrostatic attraction.
From the given structure; the key element shows that:
Fe is denoted by the red electrons, andO is denoted by the blue electronsTherefore, from the diagram, the correct formula of the ionic crystal by considering the lone pairs and valence electrons is Fe₃O₂
Learn more about ionic crystals here:
https://brainly.com/question/11638999
What is the mass of two moles of the diatomic gas, Nz?
Answer:
56.04 g
Explanation:
Step 1: Given data
Moles of nitrogen (n): 2 mol
Step 2: Calculate the molar mass of nitrogen (M)
The molar mass of the molecule is the sum of the masses of the molecules that form it.
mN₂ = 2 × mN = 2 × 14.01 g/mol = 28.02 g/mol
Step 3: Calculate the mass corresponding to 2 moles of nitrogen
We will use the following expression.
m = n × M
m = 2 mol × 28.02 g/mol = 56.04 g
A piston is filled with 80.4 liters of chlorine gas, Cl (8), at standard temperature and pressure (STP.) What is the mass of chlorine in the
piston?
The molar mass of Cl2(g) is 70.9 g/mol.
Type your answer
Answer:
Mass = 19.85 g
Explanation:
Given data:
Volume of chlorine gas = 80.4 L
Temperature = standard = 273.15 K
Pressure = standard = 1 atm
Mass of chlorine = ?
Molar mass of chlorine gas = 70.9 g/mol
Solution:
PV = nRT
R = general gas constant = 0.0821 atm.L/mol.K
By putting values,
1 atm × 80.4 L = n× 0.0821 atm.L/mol.K × 273.15 K
80.4 atm.L = n× 22.43 atm.L/mol
n = 22.43 atm.L/mol / 80.4 atm.L
n = 0.28 mol
Mass of Cl₂:
Mass = number of moles × molar mass
Mass = 0.28 mol × 70.9 g/mol
Mass = 19.85 g
The table here provides the temperature at mount rainer in Washington state at different elevations of September 3 2014 a temperature was recorded on the same mountain at the same time the temperature was 8c at what elevation was the temperature most likely taken
Answer:
2000 m
Explanation:
From the question given above, the following data were:
Elevation (m) >>>>>> Temperature (°C)
4000 >>>>>>>>>>>>> –8
3500 >>>>>>>>>>>>> –4
3000 >>>>>>>>>>>>> 0
2500 >>>>>>>>>>>>> 4
Temperature = 8 °C
Elevation =?
A careful observation of the table shows that:
Elevation is reducing with 500 m, while the temperature is increasing with 4 °C.
Next, we shall determine number of increase in the temperature. This can be obtained as follow:
Last Temperature from the table = 4 °C
New temperature = 8 °C
Difference = 8 °C – 4 °C
Number of Increase = difference / 4 °C
Number of Increase = 4 °C / 4 °C
Number of Increase = 1
Thus, the temperature increased just ones from 4 °C to 8 °C
Since the temperature increased just ones from 4 °C to 8 °C, it means the elevation will decrease just ones i.e
Last elevation from the table = 2500 m
Decrease factor = 500 m
New elevation = 2500 – 500
New elevation = 2000 m
Thus, the temperature (i.e 8 °C) was recorded at an elevation of 2000 m
1: draw the structural formula for N2 + 3H2 → 2NH3
2: draw the structural formula for 2CO2 + 3H2O → C2H5OH+ 3O2
]down below is a picture with more accurate depiction of the questions plz answer both
Answer:
Hey..! I know only 1st one answer
what is the atomic number of an atom woth six valence electrons?
(A) 8
(B)10
(C) 12
Answer:
8
Explanation:
The atomic mass of an atom refers to the number of protons in the nucleus of an atom. Hence, an element with 6 valence electron mean that it has 6 electrons in its outermost shell.
The atomic Number of elements with 6 valence electrons cannot necessarily be the same, however, elements with 6 valence electrons belong to group six on the periodic table.
From the options given above, :
Atomic number of 8 :
Configuration : 2, 6
Atomic number of 10 :
Configuration : 2, 8
Atomic number of 12 :
Configuration : 2, 8, 2
Hence, only the element with atomic number of 8 has 6 valence electrons in its outer most shell, hence, the answer.
To carry out the synthesis of hydrogen fluoride from hydrogen and difluorine, 1.0 mol of H,
and 2.0 mol of F2, are mixed in a flask having a 3.0 L capacity. The equilibrium constant for
this synthesis reaction and at a certain temperature is equal to 115.
Calculate the concentration at equilibrium of each of the components of the reaction system.
Answer:
this not easy
Explanation:
come on
Consider a 75.0-g sample of H2O(g) at 1258C. What phase or phases are present when 215 kJ of energy is removed from this sample
Answer:
Explanation:
The first process is to draw out the heating curve to have a look at the transition possible which we've shown in the file below.
Now;
To find the energy removed to convert 75g steam → ice then comparing it with 215 kJ.
So conversion of steam at 125 °C → 100 °C
[tex]\Delta H = (75 \ g) (2.0 \ J/g^0C ) (125 - 100)^0 \ C[/tex]
[tex]\Delta H = 3750 \ J[/tex]
[tex]\Delta H = 3.75 \ kJ[/tex]
Since this is lesser than the energy given (215 kJ), we then have to find the energy removed in the next phase.
For condensation of steam
Find the energy removed to change the steam from 100° C to liquid at 100° C
[tex]\Delta H_2 = ( \dfrac{75 \ g}{18.02 \ g/mol}) (40.7 \ kJ/mol)[/tex]
[tex]\Delta H_2 =1.690* 10^ 2 \ J[/tex]
[tex]\Delta H_2 =169 \ kJ[/tex]
The total energy that is now removed from the system is:
[tex]\Delta H_1+ \Delta H_2 = (169 + 3.75) \ kJ[/tex]
[tex]\Delta H_1+ \Delta H_2 \simeq 173 \ kJ[/tex] which is still lesser than 215 kJ
To the third step; which is the conversion of water at 100° C → water at 0° C
[tex]\Delta H_3 = ( 75 \ g) (4.2 \ J/g^0 C)(100-0)^0C[/tex]
[tex]\Delta H_3 = 31500 \ J[/tex]
[tex]\Delta H_3 = 31.5 \ kJ[/tex]
Thus;
[tex]\Delta H_1+\Delta H_2+\Delta H_3 = (169 + 3.75 +31.5) \ kJ[/tex]
[tex]\Delta H_1+\Delta H_2+\Delta H_3 =204 \ kJ[/tex]
To the fourth step;
For freezing of water; we need to find the energy removed to change the water at 0° C → ice at 0° C
[tex]\Delta H_4 = (\dfrac{75 \ g}{18.02 \ g/mol})(6.02 \ kJ/mol)[/tex]
[tex]\Delta H_4 = 25.1 \ kJ[/tex]
∴
To change to the solid phase at 0° C; the total energy that is being removed from the steam is
[tex]\Delta H_1+\Delta H_2+\Delta H_3 +\Delta H_4 =(169 + 3.75 + 31.5 +25.1) \ kJ[/tex]
[tex]\Delta H_1+\Delta H_2+\Delta H_3 +\Delta H_4 =229 \ kJ[/tex]
Here, the calculated total energy is more than the given energy 215 kJ.
This implies that the water is not fully converted to ice when 215 kJ of energy removal occurs, Hence the two phases that exist are liquid and solid.