How many moles of helium gas are present in 120 liters at STP
a. 10.5 moles
b. 5.00 moles
c. 6.5 moles
d. 5.4 moles
Answer:
d) n = 5.4 mol
Explanation:
Given data:
Number of moles of He = ?
Volume of He gas = 120 L
Temperature and pressure = standard
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
1 atm × 120 L = n × 0.0821 atm.L/ mol.K × 273.15 K
120 atm.L = n × 22.43 atm.L/ mol
n = 120 atm.L / 22.43 atm.L/ mol
n = 5.4 mol
Which type of lava is most likely to cause the most widespread damage
(Tap pic to see)pls help me.
Answer:
Lave from composite volcanoes
Explanation:
How does soil affect groundwater?
3. If all the waves were measured for a period of 5 seconds, which wave had the highest frequency?
Answer:
Correct answer is A.
Explanation:
Frequency is the number of oscillations that a wave have per unit time. Since time is measured in seconds, the wave with the highest frequency must register the highest number of oscillation per second. Hence, correct answer is A.
How many liters of O2 at STP will react with 8.7 grams of C2H4 to form CO2 and H2O?
C2H4 + 3 O2 -------> 2 CO2 + 2 H2O
Pls help
answers can be
21
22
2.3
The volume of O₂ : 21 L
Further explanationGiven
8.7 grams of C₂H₄
Required
Volume O₂
Solution
Reaction
C₂H₄ + 3 O₂ ⇒ 2 CO₂ + 2 H₂O
mol C₂H₄(MW= 28 g/mol) :
= mass : MW
= 8.7 g : 28 g/mol
= 0.311
From the equation, mol O₂ :
= 3/1 x mol C₂H₄
= 3/1 x 0.311
= 0.933
At STP, 1 mol gas=22.4 L, so for 0.933 mol :
= 0.933 x 22.4 L
= 20.899 L ≈ 21 L
An atom with one electron in its valence
shell will tend to:
An atom with one electron in its valence shell will tend to lose that electron to achieve the noble gas configuration and becomes a cation.
What is a cation?Cations are positively charged ions and are formed when an atom loses its electrons. They lose one or more electrons from their valence shell but do not lose any protons. Therefore, they get a net positive charge. Some examples of cations are Potassium (K⁺), Calcium (Ca²⁺), and hydrogen (H⁺).
Anions and cations are both ions and have opposite electrical charges. They feel attraction for each other. A cation repels another cation whereas an anion repels another anion.
An atom that has one electron in its valence shell will always tend to lose that electron to get completely filled electronic configuration. So the atom will convert into a cation to attain the more stable noble gas configuration.
For example, sodium has an electronic configuration 1s²2s²2p⁶3s¹. It has one electron in its valence shell, so it converts into Na⁺ by losing one electron and attains a configuration similar to Neon noble gas.
Learn more about cations, here:
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It is hard to identify a _____ strictly by color because many of them look so much alike.
Answer:
Mineral
Explanation:
Many minerals share the same colors so it would be one of the least important parts of mineral identification
What is the chemical formula and net ionic equations for all three solutions.
Answer:
See answer below
Explanation:
As you are asking for chemical formula and ionic equation, then, I will assume that after the station #5 below, are the solutions you are requiring.
You are also not specifing if you want for example, result of solution 1 + solution 3. If you need that, please post that on another question.
Now for the chemical formula, you need to identify the elements in all 3 solutions, and also the type of compound.
1. Solution 1 Barium Chloride:
In this case we have Barium on one side, and Chlorine on the other side, the symbol for those are Ba and Cl. As Barium have the +2 oxidation state, cause is the only one that it can have, when it's next to an halide like chlorine or bromine, it will form a binary salt. The halides, usually work with the lowest oxydation state. In the case of Chlorine it will be -1, so, the formula will be:
BaCl₂
And the net ionic equation will be the chemical equation that shows how the charges and atoms are balanced. In this case it would be:
Ba²⁺ + 2Cl⁻ ------> BaCl₂
2. Solution 2 and 3, Copper (II) nitrate and Copper(II) sulfate:
In this case I will work with both, because both of the solution have copper and the only difference is the anion, which is nitrate in one, and sulfate on the other. In this cases, we have a tertiary salt, The copper's symbol is Cu, and is working with it oxydation state +2. Nitrate is an anion and have the formula NO₃ working with the oxydation state -1. Sulfate is SO₄ and works with oxydation state -2 instead.
The chemical formula and ionic equation for both will be:
Copper(II) nitrate: Cu(NO₃)₂
Copper(II) sulfate: CuSO₄
And the net equations:
Copper nitrate: Cu²⁺ + 2NO₃⁻ ------> Cu(NO₃)₂
Copper sulfate: Cu²⁺ + SO₄²⁻ -------> CuSO₄
Hope this helps
Can you pls help me out
Answer:
A
Explanation:
yellow perch doesn't have a arrow to it from the snail
They apply a cumulative force of 1080 N to push the car 21,800 cm to the nearest fuel station. Determine the work done on the car.
Answer:
2.35 × 10⁵ J
Explanation:
Renatta Gass is out with her friends. Misfortune occurs and Renatta and her friends find themselves getting a workout. They apply a cumulative force of 1080 N to push the car 21,800 cm to the nearest fuel station. Determine the work done on the car.
Step 1: Given data
Force applied on the car (F): 1080 NDistance traveled by the car (d): 21,800 cmStep 2: Convert "d" to meters
We will use the conversion factor 1 m = 100 cm.
21,800 cm × 1 m/100 cm = 218 m
Step 3: Calculate the work done (W)
We will use the following expression.
W = F × d
W = 1080 N × 218 m = 2.35 × 10⁵ J
help me plz ty:}
What is the number of atoms in the reactants?
What is the number of atoms in the product?
Answer:The law of conservation of matter says that matter cannot be created or destroyed. In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. if those are answers? i cant be sure but sorry
Explanation:
Answer:
4 reactants and 4 product
Explanation:
2 mg atoms and 2 o atoms = 2 mgo
CH4 + 202 → CO2 + 2H2O
How many moles of O2 needed to react with 32 grams of CH4?
4.0 mol O₂
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 TableStoichiometry
Using Dimensional Analysis Explanation:Step 1: Define
[RxN - Balanced] CH₄ + 2O₂ → CO₂ + 2H₂O
[Given] 32 g CH₄
Step 2: Identify Conversions
[RxN] 1 mol CH₄ → 2 mol O₂
Molar Mass of C - 12.01 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of CH₄ - 12.01 + 4(1.01) = 16.05 g/mol
Step 3: Stoichiometry
Set up conversion: [tex]\displaystyle 32 \ g \ CH_4(\frac{1 \ mol \ CH_4}{16.05 \ g \ CH_4})(\frac{2 \ mol \ O_2}{1 \ mol \ CH_4})[/tex]Divide/Multiply: [tex]\displaystyle 3.98754 \ mol \ O_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
3.98754 mol O₂ ≈ 4.0 mol O₂
How is the periodic table organized?
Answer: there are sections where one side is gases and the other is non-gases. Also, the left side is more reactive and the right side is less reactive
Answer:
The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson.
Explanation:
If atoms contain charged particles, why do they not have a charge?
A.They contain the same number of protons as electrons
B.The charge is locked away in the nucleus
C.They contain equal numbers of protons and neutrons
Answer:
A
Explanation:
They have the same number of positive protons & negative electrons, hope this helps
Jessica needs 658 cups of flour for her recipe. The box she has only has 78 cup of flour left in it. How many more cups of flour does she need?
Answer:
580
Explanation:
pmz make me brainliest
6. A group of students is performing a simple scientific investigation with baking soda and vinegar. The students place vinegar in a beaker and put baking soda inside of a balloon. Then, the balloon with the baking soda is attached to the mouth of the beaker. The reaction of the baking soda being poured from the balloon into the beaker is shown Baking soda falls Vinegar and baking soda mixture into vinegar What evidence shows that a chemical change occurred with the baking soda and vinegar?
A The vinegar and baking soda released a gas.
B. The vinegar and baking soda gave off an odor.
C. The vinegar and baking soda produced a flame
. D. The vinegar and baking soda changed in temperature.
Answer:
A. The vinegar and baking soda released a gas. Hope it helps. :)
Answer:
A
Explanation: I tried this experiment a few days ago w/ my sister.
It reacted like a volcano explosion.
Tameca is planning a hiking trip. The trail she would like to follow is 7.5 miles long. She plans to start her hike at 10:00 am. She hopes to reach the end of the trail at 3:00 pm. Determine the number of miles per hour that Tameca plans to hike.Help me fill in the blank and I will vote branliest
___________________ miles per hour
Answer:
1.5 miles per hour
Explanation:
7.5 miles in 5 hours
7.5/5=1.5 miles per hour
HELP I WILL mark brainliest
Answer:
1 Hour...
Explanation:
If It’s 960 Km/h, then it will take 1 hour to fly there.
What is the change in velocity if the final velocity is 80 mph and the initial velocity is 20 mph? Is the object speeding up or slowing down?
Answer:
60mph
Explanation:
Not completely sure??
Which of the following is one way creativity can help scientists?
By ensuring they follow the scientific method.
By increasing the amount of time it takes to complete scientific experiments.
By making sure they only try things that have already been proven.
By leading them to ask more questions about the natural world.
Answer:
bye ensuring they follow the scientific method.
Explanation:
I looked it up it's been answer 29 times same answer
Seth used this model to show how water vapor becomes a liquid in the water cycle. Which part of the water cycle is he modeling?
Answer: He is modeling the condensation process in the water cycle.
What is world elevation
Explanation:
Online access to standardized measurement sets, multi-source street view, or digital surface modeling is offered by World Elevation networks. The platforms include a specific example of elevation data and derivative items for mobile apps to use
Pleaase answer ive been stuck on it for a long time
Answer:
sorry pic is not working if you can get it working i will answer
Explanation:
if you cant explain it to me
How many moles of sulfuric acid (H2SO4) are needed to react completely with 6.8 moles of lithium hydroxide (LiOH)? (4 points) 2LiOH + H2SO4 → Li2SO4 + 2H2O
Answer:
3.4 mol H2SO4
Explanation:
Took the test
How many grams is 1.2 moles of Neon?
Mass of Neon : = 24.21564 g
Further explanationGiven
1.2 moles of Neon
Required
mass of Neon
Solution
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
Mol = mass : Molar mass
so mass of Neon(MM=20,1797 g/mol) :
= mol x MM
= 1.2 x 20,1797
= 24.21564 g
What is this and explain why please:)
Answer:
C Atomic number
Explanation:
The question is typo it should be 19 is the____ of pottasium. The atomic number is the number on top
witch of the following is not a method of heat transfer?
radiation Insulation Conduction Convection
Answer:
insulation is not a method of transfer of jeat
Answer:
insulation
Explanation:
convection, conduction and radiation are all methods of heat transfer.
PLEASE HELP
The statement that "Newton knew what gravity did but he could not explain why gravity did it" is
the basic difference between
O A. A scientific law and a scientific theory
O B. A scientific theory and a societal law
O C. A scientific law and a societal law
O D. A hypothesis and a scientific law
Answer:
a
Explanation:
hopes this helps ______Г×××××××××××××××/Answer:
b
Explanation:
its not d bc no hypothesis was made
I NEED HELP BIG TIME PLZ HELP ME (ILL GIVE 40 POINTS) What is true of electrons? (3 points) a They are positively charged and located inside the nucleus. b They are positively charged and located outside the nucleus. c They are negatively charged and located inside the nucleus. d They are negatively charged and located outside the nucleus.
Answer:
d.
Explanation:
. Summarize: Complete the following statements:
A. 1 mole of any element contains 6.02 x 10^23
_______
B. 1 mole of any compound contains 6.02 x 10^23
_______
Answer:
A. 1 mole of any element contains 6.02 x 10^23 atoms.
B. 1 mole of any compound contains 6.02 x 10^23 molecules.
Explanation:
:)
Taking into account the definition of Avogadro's Number, the correct answers are:
1 mole of any element contains 6.023×10²³ atoms1 mole of any compound contains 6.023×10²³ moleculesYou have to know that Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole.
Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without an explicit dimension or unit of expression.
Avogadro's number applies to any substance, because the number of elementary units in a mole of substance is, by definition, a constant that does not depend on the material or the type of particle considered.
So, in this case, the correct answers are:
1 mole of any element contains 6.023×10²³ atoms1 mole of any compound contains 6.023×10²³ moleculesLearn more about Avogadro's Number:
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