Answer:
[tex]\boxed {\boxed {\sf About \ 2.8 \ grams \ of \ nitrogen}}[/tex]
Explanation:
To convert from moles to grams, we must use the molar mass.
1. Molar Mass
The molar mass of an element can be found on the Periodic Table. We are looking for nitrogen or N.
Nitrogen (N): 14.007 g/mol2. Convert from moles to grams
Use the molar mass as a ratio or fraction.
[tex]\frac{14.007 \ g \ N}{1 \ mol \ N}[/tex]
Multiply the given number of moles (0.20) by the fraction we just made.
[tex]0.20 \ mol \ N *\frac{14.007 \ g \ N}{1 \ mol \ N}[/tex]
When multiplied, the moles of nitrogen will cancel each other out.
[tex]0.20*\frac{14.007 \ g \ N}{1}[/tex]
The denominator of 1 can be ignored to create a simple multiplication problem.
[tex]0.20 *14.007 \ g \ N[/tex]
[tex]2.8014 \ g \ N[/tex]
3. Round
The original measurement of moles (0.20) gives 2 significant figures, the last 2 and 0.
Therefore, we must round our answer to 2 sig figs. This is the tenths place for this number of grams we found.
[tex]2.8014 \ g \ N[/tex]
The 0 in the hundredth place tells us to leave the 8 in the tenth place.
[tex]\approx 2.8 \ g\ N[/tex]
There are about 2.8 grams of nitrogen in 0.20 moles of nitrogen.
3. In an experiment it was found that 40.0cm of 0.2M sodium hydroxide solution just neutralized 0.2g
of a dibasic acid A. Calculate the relative molecular mass of acid A.
(2 marks)
The relative molecular mass of acid A : 50 g/mol
Further explanationGiven
40.0 cm³(40 ml) of 0.2M sodium hydroxide
0.2g of a dibasic acid
Required
the relative molecular mass of acid A
Solution
Titration formula
M₁V₁n₁=M₂V₂n₂
n=acid/base valence(number of H⁺/OH⁻)
NaOH ⇒ n = 1
Dibasic acid = diprotic acid (such as H₂SO₄)⇒ n = 2
mol = M x V
Input the value in the formula :(1 = NaOH, 2=dibasic acid)
0.2 x 40 x 1 = M₂ x V₂ x 2
M₂ x V₂ = 4 mlmol = 4.10⁻³ mol ⇒ mol of Acid A
The relative molecular mass of acid A (M) :
[tex]\tt M_A=\dfrac{mass }{mol}=\dfrac{0.2~g}{4.10^{-3}}=50~g/mol[/tex]
Is there a systemic racial bias that is associated with Climate Change?
Answer:
Climate change activists from Extinction Rebellion standing in solidarity with worldwide Black Lives Matter protests following the death of George Floyd, Sunday June 7, 2020 in St Ives, United Kingdom.(Gav Goulder/In Pictures via Getty Images)
“Racial justice is climate justice. That means police reform is climate policy.” Emily Atkin, a widely read climate journalist, wrote those words last week in the aftermath of the murder of George Floyd.
Atkin is not alone in making a direct connection between climate change and racism. Numerous environmental leaders and prominent climate activists have issued statements condemning police violence and expressing solidarity with racial justice organizations.
And for some notable climate movement figures, the relationship between anti-racism and climate activism extends much further than pro forma solidarity.
Writing in The New Yorker, global climate leader Bill McKibben entitled his latest article, “Racism, Police Violence, and the Climate Are Not Separate Issues.” And a recent piece by Eric Holthaus, a highly regarded meteorologist who writes about climate change, proclaimed, “The climate crisis is racist. The answer is anti-racism.”
Which two changes would make this reaction favor the formation of products? 2502 +02= 2503 + energy A. Raising the temperature B. Decreasing the pressure O C. Decreasing the temperature D. Raising the pressure
C. Decreasing the temperature
D. Raising the pressure
Further explanationGiven
Reaction
2SO₂+O₂⇔2SO₃+energy
Required
Changes to the formation of products
Solution
The formation of SO₃ is an exothermic reaction (releases heat)
If the system temperature is raised, then the equilibrium reaction will reduce the temperature by shifting the reaction in the direction that requires heat (endotherms). Conversely, if the temperature is lowered, then the equilibrium shifts to a reaction that releases heat (exothermic)
While on the change in pressure, then the addition of pressure, the reaction will shift towards a smaller reaction coefficient
in the above reaction: the number of coefficients on the left is 3 (2 + 1) while the right is 2
As the temperature decreases, the equilibrium will shift towards the exothermic reaction, so the reaction shifts to the right towards SO₃( products-favored)
And increasing the pressure, then the reaction shifts to the right SO₃( products-favored)⇒the number of coefficients is greater
Answer:
C. Decreasing the temperature
D. Raising the pressure
Explanation:
A.P.E.X
2. What do we use a meter stick to measure?
a) mass
c) length / distance
b) volume
d) weight
Answer:
c) lenght/distance
Explanation:
Metric units are mostly used in Europe (centimeters and meters instead of inches and feet)
Answer:
c. length / distance
Help pls true or false
1. Oxygen from the lungs moves into the blood by active transport.
2. Osmosis requires no ATP energy
3. Active transport over time results in equilibrium
4. Oxygen, glucose, and carbon dioxide are not permeable to the cell membrane
5. In a salty environment, cells will decrease in volume and shrivel
Answer:
1 oxygen from the lungs
Explanation:
maybe too help you breath better
If an experiment involves a large volume of liquid a _______ would most likely be used to hold it.
a.
test tube
b.
graduated cylinder
c.
hot plate
d.
beaker
Please select the best answer from the choices provided
A
B
C
D
Answer:
D. beaker on edge
Explanation:
The atomic symbol represents the _____ of the element.
Protons
Explanation: the atomic number is the same as the number of protons
whats the molar mass of CO
Answer:
28.01
Explanation:
this is the molar mass
HELP! WILL MARK BRAINLIEST! ASAP!!
According to Hund's rule, what is the expected magnetic behavior of manganese (Mn)?
Question 10 options:
Paramagnetic
Diamagnetic
Nonmagnetic
Ferromagnetic
Answer:
Mn is a Paramagnetic
Explanation:
Solve this problem using the appropriate law.
What is the volume of 0.382 moles of hydrogen gas at 1.50 atmospheres pressure and a temperature of 295 K? (R=0.0821 L - atm/mol
-K)
⚪︎ 6.17 L
⚪︎ 3.08 L
⚪︎ 4.01 L
⚪︎ 1.2 L
⚪︎ 0.23 L
Answer:
6.17 L
Explanation:
find the currents i1,i2,and i3 in the above closed circuit
Answer:
1 1A (1+2=3)
2 2A (3-1=2)
3 0.5A (2-1.5=0.5)
1) List the number of each subatomic particle in the following atoms (1 point):
a) A nitrogen atom with a mass of 17 amu.
b) An atom of potassium with a mass of 45 amu.
c) An atom of iodine with a mass of 137 amu.
a. 7 protons, 7 electrons, 10 neutrons
b. 19 protons, 19 electrons, 26 neutrons
c. 53 protons, 53 electrons, 84 neutrons
Further explanationGiven
Atom and mass number
Required
The number of each subatomic particle
Solution
a. Nitrogen atom(atomic number = 7)
mass number = 17 amu
atomic number=number of protons=number of electrons(in neutral atom)
so number of protons=number of electrons = 7
mass number = protons+neutron
17 = 7 + neutrons
number of neutrons = 17-7=10
b. Potassium atom (atomic number = 19)
mass number = 45 amu
atomic number=number of protons=number of electrons(in neutral atom)
so number of protons=number of electrons = 19
mass number = protons+neutron
45 = 19 + neutrons
number of neutrons = 45-19=26
c. Iodine atom ((atomic number = 53)
mass number = 137 amu
atomic number=number of protons=number of electrons(in neutral atom)
so number of protons=number of electrons = 53
mass number = protons+neutron
137 = 53 + neutrons
number of neutrons = 137-53=84
You have two containers at 25°C and 1 atm. One has 22.4 L of hydrogen gas, and the other has 22.4 L of oxygen gas.
Which statement is true?
The hydrogen gas container has more molecules than the oxygen gas container.
The oxygen gas container has more molecules than the hydrogen gas container.
Both containers have the same number of molecules.
Both containers contain 6.022×1023 molecules of gas.
Both containers have the same number of molecules= 5.62 x 10²³
Further explanationGiven
22.4 L of hydrogen gas
22.4 L of oxygen gas
25°C and 1 atm.
Required
true statement
Solution
Conditions at T 25 ° C and P 1 atm are stated by RTP (Room Temperature and Pressure). Vm in this condition = 24 liters / mol
and from Avogadro's Law :
At the same temperature and pressure, the ratio of gas volume will be equal to the ratio of gas moles
So two gas have the same molecules
1 mol = 6.02 x 10²³ molecules
24 L = 1 mol, so for 22.4 L :
[tex]\tt \dfrac{22.4~L}{24~L}\times 6.02\times 10^{23}~molecules=5.62\times 10^{23}~molecules[/tex]
Which property of the isotopes must be different?
the atomic number
the electric charge
the element name
the mass number
Answer:
the mass number, trust me
Answer:
D
Explanation:
4. What is the substance called that dissolves the other substance in a solution?
a. Soluto
b. Mixture
c. Solvent
d. Concentrator
Answer:
Solvent
Explanation:
When one substance dissolves into another, a solution is formed. A solution is a homogeneous mixture consisting of a solute dissolved into a solvent
QUICK IM BEING TIMED
What measurement would answer your question better, “final height of plants” or “rate of growth”?
Choose one answer.
a. Final Height of Plants
b. Rate of Growth
Answer:
B) rate of growth I'd say
Explanation:
it sounds better I don't think anyone would use height of plants if they want to sound professional
Is CuO a acidic or basic oxide
and why
Answer:
CuO is a basic oxide and when it reacts with water it gives Cu(OH)2 which is a base as it gives Cu2+ and OH− ions when dissolved in water.
PLS ANSWERERRRRRR
F. SECTION A
G. SECTION D
H. SECTION C
J. SECTION B
Answer: F
Explanation: I did that test yesterday lol
Which answer below could represent velocity?
A. 45 mph
B. 45 mph N
C. 45 mph(2)
In the chemical equation Fes - 2HCl → FeCl2 - H2S. there are two FeCl2 molecules
Please select the best answer from the choices provided
What is the answer?
Answer:Displacement reaction , as HCl displaces S of FeS to give H2S
Explanation:
how does mechanical energy depend on other forms of energy??
Answer:
Other forms of energy can convert to mechanical energy
Explanation:
For example the electric or magnetic energy in a motor can convert to mechanical energy, or another example is when you put two magnets together they will clip together due to the magnetic energy that they have.
5. What is the magnitude of the force that is exerted on a 15 kg mass to give it an acceleration of
5.0 m/s2?
a. 3N
b. 10 N
C.20 N
d. 75 N
Answer:
b
Explanation:
Answer:
D
Explanation:
you would use F=ma
therefore the answer is 75N
PLEAAAAAASE CAN SOMEONE JUST ANSWER THIS
—————————————->
The half life of Rn-222 is 3.8 days. If a basement holds 60 grams of Rn, how much will remain after 22.8 days?
Answer:0.9375, the second question is 1, the third question is 400, and the last is 3
Explanation: I just did the worksheet in my Chem class, and it was quite easy I didn't feel like going to all your questions and answering them so there ya go!
Which feature improves the safety of small modular reactors (SMRs)?
They use control rods to slow the reaction.
They can be installed underground.
They require less onsite preparation.
They produce less waste.
Answer:
They can be installed underground.
Explanation:
Keeps the reactor coolant water under high pressure to prevent it from boiling.
HELP!!!!!!!!!!! WILL GIVE EXTRA POINTS Using the five major types of chemical reactions listed below:
Combination or synthesis
Decomposition
Single replacement
Double replacement
Combustion
And using various resources from the internet, investigate how these reactions occur within the human body. Include the following information:
In what human body system does this reaction occur?
What is the purpose of this reaction in the human body?
What happens to the human body if this reaction does not occur or does not occur as it should?
Write the balanced equation for your reaction.
Include references for your research.
Which of the following would have the greatest mass?
O 2 mol He
O 6 mol b
0 4 mol Ne
O
1 mol Pb
3. How many grams are in 9.015 x 1035 atoms of Cobalt?
Answer:
8.822 × 10¹³ g Co
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
9.015 × 10³⁵ atoms Co
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Co - 58.93 g/mol
Step 3: Convert
[tex]9.015 \cdot 10^{35} \ atoms \ Co(\frac{1 \ mol \ Co}{6.022 \cdot 10^{23} \ atoms \ Co} )(\frac{58.93 \ g \ Co}{1 \ mol \ Co} )[/tex] = 8.82189 × 10¹³ g Co
Step 4: Check
We are given 4 sig figs. Follow sig fig rules and round.
8.82189 × 10¹³ g Co ≈ 8.822 × 10¹³ g Co
What are the half-reactions for a galvanic cell with Ni and Mg electrodes?
A. Ni(s) → Ni2+(aq) + 2e and Mg2+(aq) + 2e → Mg(s)
B. Ni2+(aq) + 2e → Ni(s) and Mg(s) – Mg2+(aq) + 2e
C. Ni(s) Ni2+(aq) + 2e and Mg(s) → Mg2+(aq) + 2e
D. Ni2+(aq) + 2e → Ni(s) and Mg2+ (aq) + 2e → Mg(s)
half-reactions
cathode(reduction) : Ni2+(aq) + 2e → Ni(s)
anode(oxidation) : Mg (s) → Mg²⁺ (aq) + 2e−
Further explanationGiven
Ni and Mg reaction
Required
the half-reactions
Solution
we determine which is the more reduced / oxidized of the two elements by looking at the voltaic series or the standard potential value
In voltaic series
Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au
The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent
The more to the right, the metal is less reactive (harder to release electrons) and the stronger oxidizing agent
If we look at the Mg metal located to the left of the Ni metal, so the Mg metal is more easily oxidized and can reduce the Ni metal which is on the right
Mg oxidation
Mg(s) – Mg2+(aq) + 2e
Ni reduction
Ni2+(aq) + 2e → Ni(s)
Describe how you mathematically convert the number of molecules of a
substance to moles? Create an example. PLEASE HELP.
Answer:
e.g converting 6.55×10^24 molecules of Sodium to moles.
We use Avogadro's number NA= 6.02×10^23 molecules.
Explanation:
[tex]6.02 \times {10 }^{23} molecules \: are \: in \: 1 \: mole \: of \: sodium \\ 6.55 \times {10}^{24} molecules \: will \: be \: in \: ( \frac{6.55 \times {10}^{24} \times 1}{6.02 \times {10}^{23} } ) \\ = 10.88 \: moles \: of \: sodium[/tex]
On a cold winter morning when the temperature is -13 C, the air pressure in an automobile is 1.5 atm. Using Gay Lussac's Law, what is the pressure after the tire has warmed to 15 degrees C?
Answer:
The correct answer is 1.66 atm ≅ 1.7 atm
Explanation:
Given:
T₁ = -13°C + 273 = 260 K (initial temperature)
T₂ = 15°C + 273 = 288 K (final temperature)
P₁ = 1.5 atm
P₂= ?
We use the mathematical expression of Gay Lussac's Law to calculate P₂, as follows:
P₁/T₁ = P₂/T₂
P₂= P₁/T₁ x T₂ = (1.5 atm)/(260 K) x 288 K = 1.66 atm ≅ 1.7 atm
Since the law says that the temperature of a gas is directly proportional to the pressure, when the temperature is increased, the pressure increases.