How many molecules of excess reactant remain after the reaction is complete?
2 H2 + O2 --> 2 H2O
O 4
O 2
O 6
O 8
A man does 150 J of work by pulling a vacuum cleaner horizontally with a force of 50.0 N. How far did the man pull the vacuum cleaner?
Answer:
The answer is 3 mExplanation:
The distance covered by the vacuum cleaner can be found by using the formula
[tex]d = \frac{w}{f} \\ [/tex]
w is the workdone
f is the force
From the question we have
[tex]d = \frac{150}{50} = \frac{15}{5} \\ [/tex]
We have the final answer as
3 mHope this helps you
Find the percent composition of a compound that contains 2.63 g of carbon, 0.370 g of hydrogen and 0.580 g of oxygen in a 3. 58 g sample of the compound.
Answer:
Carbon- 73.5%
Hydrogen - 10.3%
Oxygen - 16.2%
Explanation:
To find the percentage composition of each atom;
Carbon:
2.63/3.58 × 100 = 73.5%
Hydrogen:
0.370/3.58 × 100 = 10.3%
For oxygen:
0.580/3.58 × 100 = 16.2%
Taking into account the definition od percentage composition, the percent composition of each compound in this sample is
Carbon: 73.46 %Hydrogen: 10.34 %Oxygen: 16.20 %
The Percentage Composition is a measure of the amount of mass that an element occupies in a compound and indicates the percentage by mass of each element that is part of a compound.
To calculate the percentage of composition, it is necessary to know the mass of the element in a known mass of the compound.
In this case, you know that a compound that contains 2.63 g of carbon, 0.370 g of hydrogen and 0.580 g of oxygen in a 3. 58 g sample of the compound.
Dividing the mass amount of each element present in the compound by the mass of the sample and multiplying it by 100 to obtain a percentage value, the percentage composition of each element is obtained:
Carbon: [tex]\frac{2.63 g}{3.58 g}x100=[/tex] 73.46 %Hydrogen: [tex]\frac{0.37g}{3.58 g}x100=[/tex] 10.34 %Oxygen: [tex]\frac{0.58 g}{3.58 g}x100=[/tex] 16.20 %Finally, the percent composition of each compound in this sample is
Carbon: 73.46 %Hydrogen: 10.34 %Oxygen: 16.20 %Learn more about percent composition:
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What relationship between the speed of each car and its motion after the collision do you observe? How do Newton's laws help explain your observations?
Answer:
I think that the previous answer will help you with this one, Newton´s laws explain it because of the action-reaction law, the resulting forces will be balanced or overloaded in one object, depending of the mass acceleration/speed or force applied to one object.
Explanation:
How many moles are present in 60 grams of hydrochloric acid, HClHClH?
a. 1.65 moles
b. 36.45 moles
c. 60 moles
Selected:d. 1.40 moles
Answer:
C 60
Explanation:
waves move fastest in?
low temperature gasses
low temperature solids
high temperature gasses
high temperature solids
Answer:
High temperature solids
Explanation:
Just got the quiz done
Which determines the reactivity of an alkali metal?
Answer:
Its ability to lose electrons
Explanation:
The attraction from the positive nucleus to the negative electron is less. This makes it easier to remove the electron and makes the atom more reactive.
Answer:
When it's able to lose electrons when it bonds with another substance.
A wavelength is the___
of one ____ ____
Answer: A wavelenghth is the distance between successive crests of one wave.
10 POINTS The equations are not balanced. Which equation would have the same coefficients in the same order as 2CO2 + 3H20 C2H6O + 3O2?
FeCl3 + NH4OH Fe(OH)3 + NH4Cl
CH4 + O2 CO2 + H2O
Fe + H2SO4 Fe2(SO4)3 + H2
PCl5 + H2O HCl + H3PO4
Answer:
the answer is D
Explanation:
I just took the test
To see the number of atoms of an element we need to multiply the stoichiometry to the the number that is written on the foot of that element. Equation 3 would have the same coefficients in the same order as [tex]\rm 2CO_2 + 3H_20\rightarrow C_2H_6O + 3O_2[/tex].
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side.
[tex]\rm FeCl_3+ NH_4OH \rightarrow Fe(OH)_3+ NH_4Cl[/tex]
Balance Cl by adding coefficient to NH[tex]_4[/tex]Cl
[tex]\rm FeCl_3+ NH_4OH \rightarrow Fe(OH)_3+ 3NH_4Cl[/tex]
Balance O by adding coefficient to NH[tex]_4[/tex]OH
[tex]\rm FeCl_3+ 3NH_4OH \rightarrow Fe(OH)_3+ 3NH_4Cl[/tex]
[tex]\rm CH_4 + O_2\rightarrow CO_2 + H_2O[/tex]
Balance H by adding coefficient to H[tex]_2[/tex]O
[tex]\rm CH_4 + O_2\rightarrow CO_2 + 2H_2O[/tex]
Balance O by adding coefficient to O[tex]_2[/tex]
[tex]\rm CH_4 + 2O_2\rightarrow CO_2 + 2H_2O[/tex]
[tex]\rm Fe + H_2SO_4 \rightarrow Fe_2(SO4)_3 + H_2[/tex]
Balance sulfur by adding coefficient to H₂SO₄
[tex]\rm Fe + 3H_2SO_4 \rightarrow Fe_2(SO4)_3 + H_2[/tex]
Balance hydrogen by adding coefficient to H₂
[tex]\rm Fe + 3H_2SO_4 \rightarrow Fe_2(SO4)_3 + 3H_2[/tex]
Now Balance Fe by adding coefficient to Fe
[tex]\rm 2Fe + 3H_2SO_4 \rightarrow Fe_2(SO4)_3 + 3H_2[/tex]
[tex]\rm PCl _5 (s) + H _2 O (l) \rightarrow H _3 PO _4(aq) + HCl (aq)[/tex]
can be balanced as
[tex]\rm PCl _5 (s) + 4 H _2 O (l) \rightarrow H _3 PO _4(aq) + 5 HCl (aq)[/tex]
Therefore, equation 3 would have the same in the same order as [tex]\rm 2CO_2 + 3H_20\rightarrow C_2H_6O + 3O_2[/tex].
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A car is traveling with velocity of 40 m/s and has a mass of 1120 kg. The car has __________ energy.
A. Kinetic
B. Potential
Answer:
A.
Explanation:
The car has kinetic energy.
if we weigh 30 kgf on the earth,how much will you weigh on the moon
Answer:
5
Explanation: 1/6 of 30 is 5
i need help with chem ????????
Answer:
69
Explanation:
please help
How many joules of heat are needed to raise the temperature of 250 g of liquid weer by 500°C
Answer:
What is the total number of joules of heat energy needed to 16) How many joules of heat ... raise the temperature of 10 grams of water from 20°Сto ... 2) · The temperature of 100 grams of water changes from 16°C/7How many kilojoules of ... temperature of 500. grams of water from 10.0°C to 30.0°C? ... m250 -Q=209051. | c= ...
Explanation:
I hope I help :))
Convert 6.7 x 1024 molecules of nitrogen dioxide into grams.
Answer:
510 g NO₂
General Formulas and Concepts:
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Reading the Periodic TableWriting CompoundsUsing Dimensional AnalysisExplanation:
Step 1: Define
6.7 × 10²⁴ molecules NO₂ (Nitrogen dioxide)
Step 2: Define conversions
Avogadro's Number
Molar Mass of N - 14.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of NO₂ - 14.01 + 2(16.00) = 46.01 g/mol
Step 3: Use Dimensional Analysis
[tex]6.7 \cdot 10^{24} \ molecules \ NO_2(\frac{1 \ mol \ NO_2}{6.022 \cdot 10^{23} \ molecules \ NO_2} )(\frac{46.01 \ g \ NO_2}{1 \ mol \ NO_2} )[/tex] = 511.901 g NO₂
Step 4: Check
We are given 2 sig figs. Follow sig fig rules.
511.901 g NO₂ ≈ 510 g NO₂
What is one way to reduce the use of nonrenewable energy resources?
Answer:
By increasing the use of renewable energy sources!
Explanation:
To satisfy the need for power in (whatever country you live in) you need to have a certain quota of power. This is typically achieved by the use of oil and natural gasses. You can also achieve it though by using thermal energy as well as solar energy (Solar Panels), and wind, kinetic, and water. (Windmills and Watermills). These are quite difficult to make and cost a lot of money to produce and kept running smoothly. So to cut back on cost we just use oil/natural gasses. But to answer your question, we need more renewable energy to make nonrenewable energy less used!
The logarithimic formula is not as complicated as it seems. For example, what is the pH of a solution with a H+ concentration of 1.00 x 10^-4 M?
Answer:
pH of given solution is 4
Explanation:
Given data:
pH of solution = ?
Concentration of H⁺ = 1.00 ×10⁻⁴M
Solution:
Formula:
pH = -log[H⁺]
pH = -log[ 1.00 ×10⁻⁴]
pH = 4
Thus, the pH of given solution is 4.
how many moles of carbon are in 3.0 moles of c6h12o6
Answer:
i.e. mass of 1 mole of glucose, C6H12O6 = (6 × 12.01 + 12 × 1.01 + 6 × 16.00) g = 180.18 g (using atomic weight data to 2 decimals) 1 mole of carbon atoms weighs 12.01 g and there are 6 moles of C atoms in 1 mole of glucose, so the mass of carbon in 1 mole of glucose = 6 × 12.01 g = 72.06 g.
One mole of gas occupies a volume of 1 litres at 27 ° C.what will be pressure of gas?
Answer:
P = 24.63 atm
Explanation:
Given data:
Number of moles of gas = 1 mol
Volume of gas = 1 L
Temperature of gas = 27°C
Pressure of gas = ?
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
Now we will convert the temperature.
27+273 = 300 K
P ×1 L = 1 mol × 0.0821 atm.L/ mol.K × 300 K
P = 24.63 atm.L /1 L
P = 24.63 atm
How many Joules of energy are needed to raise 87.3 grams of aluminum from 22,5 C to 47.3. C. The specific heat of aluminum is 0.903 V&C.
Joules
Energy needed : 1955.03 J
Further explanationHeat can be formulated:
Q=m.c.Δt
Q=heat,J
m=mass,g
c=specific heat,J/g °C
Δt=temperature, °C
m=87.3 g
Δt= 47.3-22.5=24.8 °C
c=0.903 J/g °C
[tex]\tt Q=87.3\times 0.903\times 24.8=1955.03~J[/tex]
Physics is ______ about
how things move and why things move
Answer: Physics is about
how things move and why things move
Explanation:
Which of the following is an oxidation-reduction reaction? ZnS(s) + 2O2(g) ZnSO4(s) CaO(s) + H2O(l) Ca(OH)2(s) 6Li2O(s) + P4O10(g) 4Li3PO4(s) SO2(g) + H2O(l) H2SO3(aq)
ZnS(s) + 2O₂(g) ⇒ZnSO₄(s)
Further explanationThe oxidation-reduction reaction or abbreviated as Redox is a chemical reaction in which there is a change in oxidation number
Oxidation is an increase in oxidation number, while reduction is a decrease in oxidation number.
Reaction
ZnS(s) + 2O₂(g) ⇒ZnSO₄(s)
S²⁻ (-2 in ZnS) to S⁺⁶(+6 in ZnSO₄) ⇒ oxidation
O₂(0 in O₂) to O⁻²(-2 in ZnSO₄)⇒ reduction
Answer:
A. ZnS(s) + 2O2(g) Right arrow. ZnSO4(s)
Explanation:
Depicted below you will see the molecules COH2 and SO3 . Why is COH2 polar while SO3 isn’t?
Answer:
See explanation
Explanation:
When we look at SO3 we will notice that the compound is trigonal planar and it is symmetric. This means that it has equal charge distribution hence its dipoles cancel out resulting in a zero net dipole moment.
However, COH2 is also trigonal planar but is non-symmetric. Hence, its dipole moments do not cancel out, hence the molecule has a resultant dipole moment and is a polar molecule
Atoms are not changed in a reaction. They are just _____
A.conservation
B.equal
C.Equation
D.product
E.reactant
J.rearranged
Help please I need the answer ASAP
Atoms are not created or destroyed in a chemical reaction, they are just rearranged from the reactants to form the products. This is the reason why symbol equations must be balanced.
How do volcanos such as ojos del salado form?
Answer:
Deep inside Earth, between the molten iron core and the thin crust at the surface, there is a solid body of rock called the mantle. When rock from the mantle melts, moves to the surface through the crust, and releases pent-up gases, volcanoes erupt.
Explanation: hot molten rock, ash, and gases escape from the volcano
7. At what structures in the lungs do the exchange of oxygen and carbon dioxide take place?
A. Bronchi B. Alveoli C. Bronchioles D. Trachea
LA
Answer:
Answer is Alveoli
Hope it helps.... plz mark as brainliest
A neutral atom of Cobalt (Co) has an atomic number of 27 and an atomic mass of 59. Therefore, Co has _________________________
Answer:
A neutral atom of Cobalt (Co) has an atomic number of 27 and an atomic mass of 59. Therefore, Co has 27 electrons, 27 protons and 32 neutrons.
Explanation:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.
The atomic number Co is 27 it means it has 27 protons and 27 electrons.
The mass number is sum of protons and neutrons, thus number of neutrons are
59 - 27 = 32 neutrons
Hydrofluoric acid (HF) can be prepared according to the following equation:
CaF2 + H2SO4 2 HF + CaSO4.
How many grams of HF can be prepared from 75.0 g of H2SO4 and 63.0 g of CaF2?
In the above problem, which reactant is limiting and which is in excess?
Given the balanced equation:
( Reaction type : double replacement)
CaF2 + H2SO4 → CaSO4 + 2HFI
We can determine the number of grams prepared from the quantity of 75.0 H2SO4, and 63.0g of CaF2 by converting these grams to moles per substance.
This can be done by evaluating the atomic mass of each element of the substance, and totaling it to find the molecular mass.
For H2SO4 or hydrogen sulfate it's molecular mass is the sum of the quantity of atomic mass per element. H×2 + S×1 + O×4 = ≈1.01×2 + ≈32.06×1 + ≈16×4 = 2.02 + 32.06 + 64 = 98.08 u (Dalton's or Da) or g / mol.
For CaF2 or calcium fluoride, it's molecular mass adds 1 atomic mass of calcium and 2 atomic masses of fluoride due to the number of atoms.
Ca×1 + F×2 = ≈40.07×1 + ≈19×2 = 40.08 + 38 = 78.07 u (Da or Dalton's) or g / mol.
The limiting reactant in the given balanced reaction is sulphuric acid. The mass of HF produced from 75 g of H₂SO₄ is 30 g.
What is limiting reactant?The limiting reactant in a species is the reactant which is fewer in amount and thus determine the yield of the product.
In the given reaction, one mole of calcium fluoride reacts with one mole of sulphuric acid to give two moles of HF. The molar mass of calcium fluoride CaF₂ is 78 g/mol the weight taken here is 63 g. Thus number of moles is 63/78 = 0.87 moles.
The molar mass of sulphuric acid H₂SO₄ is 100g/mol. The weight taken here is 75 g and thus, number of moles is 75/100 = 0.75 moles. One mole of calcium fluoride need one mole of H₂SO₄ . Thus 0.87 neede 0.87 moles of H₂SO₄ . But here we have only 0.75. Thus it is the limiting reactant.
As per the reaction, one mole or 100 g of H₂SO₄ produce 2 moles or 40 g of HF (molar mass = 20 g/mol). Thus mass of HF produced from 75 g is calculated as follows:
mass of HF = (75 × 40)/100
= 30 g.
Hence, mass of HF produced in this reaction is 30 g.
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if a baloon filled with dry hydrogen weighs 35 gram,but weighs 440 grams when filled with the vapour of an organic compound. calculate the vapour density and RMM of the organic compound.
Answer:
1) The vapor density of the organic compound is approximately 12.57
2) The relative molar mass (RMM) of the organic compound is approximately 25.14 grams
Explanation:
1) The mass of the balloon filled with dry hydrogen = 35 grams
The mass of the balloon filled with vapor of an organic compound = 440 grams
The vapor density = (Weight of a given volume of gas)/(Weight of equal volume of hydrogen)
The vapor density of the organic compound = (440)/(35) ≈ 12.57
The vapor density of the organic compound ≈ 12.57
2) The relative molar mass (RMM) = 2 × vapor density
The relative molar mass (RMM) of the organic compound = 2 × vapor density of the organic compound
The relative molar mass (RMM) of the organic compound ≈ 2 × 12.57 ≈ 25.14 grams
The relative molar mass (RMM) of the organic compound ≈ 25.14 grams
what's the functional group if ch3c2ch3oh
How many atoms is 3.49x1032 moles of KOH?
2.1 x 10⁵⁶ atoms
Further explanationThe mole is the number of particles(molecules,atoms,ions) contained in a substance
1 mol = 6.02.10²³
number of atoms :
[tex]\tt 3.49\times 10^{32}\times 6.02\times 10^{23}=2.1\times 10^{56}[/tex]
