Answer:
4 moles of HCl are produced.
Explanation:
Given data:
Mass of hydrogen = 4 g
Number of moles of HCl = ?
Solution:
H₂ + Cl₂ → 2HCl
Number of moles of hydrogen:
Number of moles = mass/molar mass
Number of moles = 4 g/2 g/mol
Number of moles = 2 mol
now we will compare the moles of hydrogen and HCl.
H₂ : HCl
1 : 2
2 : 2/1×2 = 4 mol
Thus, 4 moles of HCl are produced.
17.5 kJ of energy is used to raise the temperature of 250 g of ethanol new temperature?
Boiling tube containing calcium hydroxide
Answer:
making and testing ammonia/experiment /
2020.is crazy
2021 is_____??!?!?
Answer:
zany
Explanation:
Answer:
a fresh start
Explanation:
calculate the mass of atoms of carbon and 3 molecules of hydrogen
The mass of atoms of carbon and 3 molecules of hydrogen : 18 g/mol
Further explanationAn atomic mass unit ( amu or "u") is a relative atomic mass of 1/12 the mass of an atom of carbon-12.
The molar mass(molecular mass-formula mass-molecular weight(MW)) of a compound is the sum of the relative atomic mass (Ar) of the constituent elements of the compound
Can be formulated :
M AxBy = (x.Ar A + y. Ar B)
The mass of atom of Carbon(C)⇒Ar = 12 g/mol
The mass of 1 molecule of Hydrogen - H₂(MW) : 2 g/mol
The mass of 3 molecules of Hydrogen : 3 x 2 = 6 g/mol
So the mass of atoms of carbon and 3 molecules of hydrogen :
[tex]\tt 12+6=18~g/mol[/tex]
The technetium-99 isotope has a half-life of 6.0 hours. If 100.0 mg were injected into a
patient how much remains after 18 hours?
Answer:
12.5mg of technetium-99 remain
Explanation:
When a radioactive isotope decays in the time, its concentration follows the equation:
ln[A] = -kt + ln[A]₀
Where [A] could be taken as the mass of radioactive isotope after time t (18h),
k is rate constant = ln 2 / Half-Life = ln 2 / 6hours = 0.1155hours⁻¹
[A]₀ is initial amount of the isotope = 100.0mg
Replacing:
ln[A] = -0.1155hours⁻¹ *18hours+ ln[100.0mg]
ln[A] = 2.5257
[A] =
12.5mg of technetium-99 remain
7. What is the molar concentration of glucose in a solution containing 4.82 g of
glucose in 29.5 mL of solution? Hint: This is a multi-step problem
Which tool could be used to measure the mass of a rock?
A. Measuring cup
B. Digital thermometer
C. Triple-beam balance
D. Graduated cylinder
how many molecules are in 4Li2SO4?
Answer:
4
The molecule here is LiSO4, because the definition of a molecule is 2 or more molecules chemically bound together. A coefficient of 4 is another way of saying "4 molecules of LiSO4"
3.Write the chemical equation for the reaction when methane burns in (2)
(a) Sufficient supply of oxygen
(b) Insufficient supply of oxygen
Answer:
a. CH4 + 2O2 = CO2 + 2H2O
b. 2CH4 + 3O2 = 2CO + 4H2O
please someone describe the graph of the cooling curve of water !!!!!!!!!!!!!!!! Please answer !!!!!!!!!! HELP
It decreases it's temperature and it take about 10 hours for it to decrease
Yes buba booey
Correct answer gets brainliest
Answer:
e,b and d
Explanation:
Answer:
a,b,d,e
Explanation:
getting 20 characters longgggggggggbs o i can do thisssss
The atmospheric pressure is highest at...
Answer: Sea Level
Explanation: facts
2) How does matter change? That was a question students were
investigating in class. Each group had an experiment to carry out and
then determine if the changes observed indicated a physical or
chemical change. Here is one groups experimental procedure and
results.
Before
Mix
Aler
ALS
1000 m
vinegar
84
Rowe
1000 ml
solution
34
Rece
84
RP
23c
Changing
Tempe
Temper
Temperature
What type of change occurred? Cite any appropriate evidence.
A)
Chemical; the Alka-Seltzer tablet dissolved and
disappeared.
B)
Chemical; nothing new was formed.
C)
Chemical; a gas was produced and the temperature
changed.
D)
Physical; the Alka-Seltzer tablet dissolved and
disappeared.
which type of circuit has a string of lights and one light goes out but the others stay lit
Answer:parrallel
Explanation:
To protect against a fire, copper used for wiring in a house would best be covered with
Plastic or rubber as non metal are bad conductor of electricity.
when an atom gains a valence electron, it become a (n)_____ion.
An atom that gains electrons and becomes negatively charged is known as an anion.
Hope it helps!
Name 8 ways why landfill is bad for earth
Answer:
1.Creates environmental hazards
2.Can contribute to global warming processe
3.Can pollute harmful and toxic things in the air
4.has harmful gases that can hurt the environment including the water and soil
5.A waste of space that is taking up the earth
6.full of rubbish and toxins that can effect the environment
7.can hurt humans and animals because of the toxic chemicals produced in the air
8.Make the land soil weaker because of the bad toxins and chemicals
13. When compared with the blood in the arteries,
the blood in the veins...
1 does not move at all
2 is under lower pressure
3 contains more gases
4 contains more water
Answer:
is under lower pressure
Explanation:
I think because arteries is for oxygenated blood so it flows very fast and the pressure is big but for veins , it is for deoxygenated blood that flows slower than oxygenated blood, so of course the pressure is lower.
What is happening to the energy storage molecules in the plants and humans in the space station?
Answer:
Answer is in photo
Explanation:
calculate the enthalpy for the reaction D + F = G + H using
G + C = A + B deltaH = 277
C + F = A delta H = 303
D = B + H delta H = -158
The enthalpy for the reaction : ΔH = -132
Further explanationGiven
Reaction and the enthalpy
Required
the enthalpy
Solution
Hess Law
Reaction 1 reverse :
A + B = G + C ΔH = -277
Reactions 2 and 3 remain the same (unchanged)
C + F = A ΔH = 303
D = B + H ΔH = -158
Add up all the reactions and remove the same compound from two different sides
D + F = G + H ΔH = -132
Factors that affects properties of a solution
C- row 2, colun
II. Write "T" if the statement is true, and “F” if it is false,
Change the underlined word(s) to make the statement
true.
1. In the periodic table as suggested by Mendeleev, elements were
arranged in the order of increasing atomic number.
2. Sodium (Z=11) is a member of a group called alkaline earth
metals.
3. Elements to the extreme right of the periodic table are metals.
4. Metalloids have properties of metals and non-metals.
Answer:
1). In the periodic table as suggested by Mendeleev, elements were
the periodic table as suggested by Mendeleev, elements werearranged in the order of increasing atomic number.
--> T
2). Sodium (Z=11) is a member of a group called alkaline earth
Sodium (Z=11) is a member of a group called alkaline earthmetals.
--> T
3). Elements to the extreme right of the periodic table are metals.
--> F
They are non-metals .
4). Metalloids have properties of metals and non-metals.
--> T
Which of these elements has an atom with the most stable outer electron configuration?
1.Br 2.Ne 3.Zn 4.Ag
Answer:
Ne
Explanation:
Neon is the element with the most stable outer electron configuration because it has eight valence electrons that fill the outer shell. Eight electrons in the outer shell is the most stable arrangement of electrons. Neon is also a noble gas which means that due to it already having a complete outer shell, it doesn't lose, gain, or share electrons. Therefore, it is stable.
Hope that helps.
Incomplete Lewis structures for the nitrous acid molecule, HNO2, and the nitrite ion, NO2-, are shown here. (a) Complete each Lewis structure by adding electron pairs as needed. (b) Is the formal charge on N the same or different in these two species? (c) Would either HNO2 or NO2- be expected to exhibit resonance?
The Lewis structure shows electron pairs in bonds between the atoms and the solitary electron pairs that remain for each atom. (a) in attached files, (b) the formal charge on N is the same +3, (c) NO₂⁻ exhibits resonance
-------------------------------
Nitrous acid molecule, HNO₂
Lewis structureN has 5 electrons
H has 1 electron
O has 6 electrons
There are two single bonds between H, O, and N
There is one double bond between N and the other O
Each bond represents two electrons
Excepting H, the other elements need to have eight electrons in total.
5 eletrons from N + 1 eletron from H + 12 electrons from the two O = 18 e⁻
18 e⁻ = 9 pairs or electrons
The two simple bonds + the double bond represent 4 electron pairs. So, there are still 5 electron pairs to place.
One of the O forms two single bonds, so it already has 2 pairs of electrons. It needs two more pairs to get the 8e⁻. So 4 electrons are placed arround this O.
The other O forms a double bond with N. The double bond represents 4 electrons. So this O needs another 4 electrons to get to the octet. Two pairs are placed arround this atom.
N forms a single bond with one O and a double bond with another O, so it already has 6 electrons. It only needs 2 more electrons to get to the octet. One pair is placed over the atom.
Finally H does not need to get any other electron
Nitrite ion, NO₂⁻
Lewis structureN has 5 electrons
O has 6 electrons
And there is a free negative charge, e⁻
There is one single bond between one of the O, and N
There is one double bond between N and the other O
The double bond is composed of a single bond and a resonant bond
Each bond represents two electrons
5 eletrons from N + 12 electrons from the two O + 1e⁻ = 18 e⁻
18 e⁻ = 9 pairs or electrons
The single bonds + the double bond represent 3 electron pairs. So, there are still 6 electron pairs to place.
One of the O forms one single bond, so it already has 2 electrons. It needs three more pairs to get the 8e⁻. So 6 electrons are placed arround this O.
The other O forms a double bond with N. The double bond represents 4 electrons. So this O needs another 4 electrons to get to the octet. Two pairs are placed arround this atom.
N forms a single bond with one O and a double bond with another O, so it already has 6 electrons. It only needs 2 more electrons to get to the octet. One pair is placed over the atom.
b) The formal charge on N (= +3) is the same for both species
The formal charges refer to the partial charges of each atom that are shared with another atom. It is the difference between the total valence electrons (8), the electrons that are not in the bond (2), and half the shared electrons (3).
formal charge on N = 8 - 2 - 3 = +3
c) Since nitrite ion, NO2- is the only one that exhibits a symetrical structure, it is the only one expected to show resonance.
------------------------------
You can learn more about the Lewis structure at
https://brainly.com/question/4144781
https://brainly.com/question/1968297
Which formula compares a sample of a gas under two different conditions of pressure and volume, if the temperature is constant?
⚪︎ x/y = k
⚪︎ xy = k
⚪︎ PV = k
⚪︎ V/T = k
⚪︎ P1V1 = P2V2
Answer:
Explanation:
V/t
Based on the information in the table, which two elements are most likely in the same group, and why?
How many moles do you have in 17.23 grams of Cu(SO4)2
Answer:
0.06739 mol Cu(SO₄)₂
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
17.23 g Cu(SO₄)₂
Step 2: Identify Conversions
Molar Mass of Cu - 63.55 g/mol
Molar Mass of S - 32.07 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of Cu(SO₄)₂ - 63.55 + 2(32.07) + 8(16.00) = 255.69 g/mol
Step 3: Convert
[tex]17.23 \ g \ Cu(SO_4)_2(\frac{1 \ mol \ Cu(SO_4)_2}{255.69 \ g \ Cu(SO_4)_2} )[/tex] = 0.067386 mol Cu(SO₄)₂
Step 4: Check
We are given 4 sig figs. Follow sig fig rules and round.
0.067386 mol Cu(SO₄)₂ ≈ 0.06739 mol Cu(SO₄)₂
What is the temperature of 0.750 mol of a gas stored in a 6,850 mL cylinder at 2.21 atm? Use P V equals n R T. and R equals 0.0821 StartFraction L times atmospheres over moles time K EndFraction.. 2.95 K 5.24 K 138 K 246 K
Answer:
D on Edge2021
Explanation:
trust me bro
The temperature of 0.750 mol of a gas stored in a 6,850 mL cylinder at 2.21 atm will be 245.9K. Hence, Option (D) i.e, 246 K is correct. It can be solved with the help of Ideal gas equation.
What is Ideal gas equation ?
The ideal gas equation is formulated as: PV = nRT.
In the above equation, P refers to the pressure of the ideal gas, V is the volume of the ideal gas, n is the total amount of ideal gas that is measured in terms of moles, R is the universal gas constant, and T is the temperature.
Given ,
p = 2.21 atmV = 6850 ml (=6.85 L)n = 0.750 molR = 0.0821 atmL/mol KFrom,
PV=nRT
T = (2.21×6.85) ÷ (0.750×0.0821)
T = 245.9K i.e, 246 K approx
Therefore, The temperature of 0.750 mol of a gas stored in a 6,850 mL cylinder at 2.21 atm will be 245.9K. Hence, Option (D) i.e, 246 K is correct.
Learn more about Ideal gas here ,
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Question 17 of 25
What gets oxidized in an electrolytic cell made with nickel and copper
electrodes?
A. Ni2+
B. Ni(s)
C. Cu(s)
O D. Cu2+
Answer: it is Cu(s)
Explanation:
PLZ HELP ASAP What is the common name of this organism?
Answer:
Sea Anemone
Explanation: