If you have half a mole of octane (c8h18), how much water is produced? 2c8h18 + 25o2 --> 16co2 + 18h2o
Answer:
4.5 moles H₂O
or
81.072 g H₂O
Explanation:
I am not exactly sure whether you want moles H₂O or grams H₂O. So, I'll calculate both. To find the moles H₂O, you'll need to covert moles C₈H₁₈ to moles H₂O via the mole-to-mole ratio from the reaction coefficients. To find the grams H₂O, you need to convert moles H₂O to grams H₂O via the molar mass.
2 C₈H₁₈ + 25 O₂ ---> 16 CO₂ + 18 H₂O
0.5 mole C₈H₁₈ 18 moles H₂O
----------------------- x ------------------------- = 4.5 moles H₂O
2 moles C₈H₁₈
Molar Mass (H₂O): 2(1.008 g/mol) + 16.00 g/mol
Molar Mass (H₂O): 18.016 g/mol
4.5 moles H₂O 18.016 g
---------------------- x ---------------- = 81.072 g H₂O
1 mole
Considering the activity series given below for metals and nonmetals, which reaction will occur? Al > Mn > Zn > Cr > Fe > Cd > Co > Ni > Sn > Pb > H > Sb > Bi > Cu > Ag > Pd >Hg > Pt F > Cl > Br > I
(a) 2NaBr + I2 --> 2NaI + Br2
(b) 2Fe + Al2O3 --> 2Al + Fe2O3
(c) 2AgNO3 + Ni --> Ni(NO3)2 + 2Ag
(d) Pb + Zn(C2H3O2)2 --> Zn + Pb(C2H3O2)2
(c) 2AgNO3 + Ni --> Ni(NO3)2 + 2Ag
How many moles of oxygen are in 4.4 moles of Al(NO3)3 ?
Answer: 40. mol (to 2 sf)
Explanation:
Since there are 9 oxygen atoms in every molecule of aluminum nitrate, this means that there are 9 moles of oxygen atoms in each mole of aluminum nitrate.
So, in 4.4 moles, there are 9(4.4) = 40. mol (to 2 sf)
can see all wavelengths/photons of light emitted from excited electrons.
No, all wavelengths/photons of light are emitted from excited electrons.
What is wavelength?Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire.
When an atom's electrons move to a lower energy state, the atom releases energy in the form of a photon. Depending on the energy involved in the emission process, this photon may or may not occur in the visible range of the electromagnetic spectrum.
Hence, no, all wavelengths/photons of light are emitted from excited electrons.
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would you expect the substance to float or sink in water if mass is 25g and volume is 7 cm
Answer:
Sink
Explanation:
For a substance to float in water, it must be less dense than water. The density of water is 1 g/cm^3. To find the density of the substance, we can do mass/volume, which in this case is 25g/7cm^3. We see that [tex]25/7 > 1[/tex], so the substance would sink.
Why does carbonic acid gives an acid salt but hydrochloric acid does not?
Answer:
Solution. Carbonic acid is a dibasic acid with two replaceable hydrogen ions; therefore it forms one acid salt or one normal salt. Hydrochloric acid is a monobasic acid with one replaceable hydrogen ion and so forms only one normal salt.
Explanation:
what are the benefits of organic farming
Which shows an isomer of the molecule below?
Answer: C
Explanation:
A) There is 1 fewer hydrogen atom.
B) There are 2 fewer carbon atoms.
D) There is 1 extra hydrogen atom.
Use the periodic table to answer the following questions.
What is the predicted order of first ionization energies from highest to lowest for beryllium, calcium, magnesium, and strontium?
Be > Ca > Mg > Sr
Be > Mg > Ca > Sr
Ca > Sr > Be > Mg
Sr > Ca > Mg > Be
From the highest to lowest Ionization Energies for beryllium, calcium, magnesium, and strontium, the order is: Be > Mg > Ca > Sr
How to use the periodic table?Ionization energy is defined as a measure of the difficulty in removing an electron from an atom or ion or the tendency of an atom or ion to give off an electron.
Now, ionization energy usually decreases as it descends in a group. Thus, from the highest to lowest for beryllium, calcium, magnesium, and strontium, the order is determined as:
Be > Mg > Ca > Sr
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Answer: B (BE > MG > CA > SR)
Explanation: ON EDGE
Answer this please!!!
Answer:
c
Explanation:
The answer is both i and iii.
How many grams of oxygen gas (02) are needed to completely react with 9.30 moles
of aluminum?
4A1+302 → 2Al2O3
9.30 mol Al
3 mol O₂
4 mol Al
32.0 g 0₂
1 mol O₂
[?] g 0₂
Answer:
223 g O₂
Explanation:
To find the mass of oxygen gas needed, you need to (1) convert moles Al to moles O₂ (via the mole-to-mole ratio from reaction coefficients) and then (2) convert moles O₂ to grams O₂ (via the molar mass). When writing your ratios/conversions, the desired unit should be in the numerator in order to allow for the cancellation of the previous unit. The final answer should have 3 sig figs because the given value (9.30 moles) has 3 sig figs.
4 Al + 3 O₂ ----> 2 Al₂O₃
^ ^
Molar Mass (O₂): 32.0 g/mol
9.3 moles Al 3 moles O₂ 32.0 g
------------------- x --------------------- x -------------------- = 223 g O₂
4 moles Al 1 mole
If 0.889J of heat causes a 0.124 degree C temperature change, what mass of water is present?
0.889 ÷ 4187 ÷ 0.124 = 0.00171
4. How many moles of atoms are present in 7 moles of sulfuric acid, H₂SO4?
Avogadro's Number: 6.022 X 1023
a) 7 x 6 x 1023
b) 49
c) 21
d) 7
Answer:
49 moles of atoms
Explanation:
There are 7 individual atoms in each molecule of H2SO4: (2 hydrogens + 1 sulfur + 4 oxygens).
Therefore, if 7 moles are decomposed, there would be 7 times that amount of individual atoms:
7 x 7 = 49 moles of atoms
What is the si unit that refers to the number of particles contained in a substance.
Answer:
one mole contains exactly 6.022 14076 into 10 23 elementary this number is the fix numerical value of the evandi and the constant and a b where expects in the unit mol - 1 is called the abacation number that amount of substance of a system is measured of the number specific
How many grams of nitrogen,
N2, would be required to react with
6.25 moles hydrogen, H2?
N₂ + 3H₂ → 2NH3
[?] g N₂
Answer: 29.2
Explanation:
From the coefficients of the equation, we know that for every 3 moles of hydrogen consumed, 1 mole of nitrogen is consumed.
This means we would need 6.25/3 = 2.0833333333333 mol of nitrogen.
Nitrogen has an atomic mass of 14.007 g/mol, so 2.0833333333333 moles of nitrogen have a mass of (14.007)(2.0833333333333) = 29.2 g (to 3 sf)
Heat _____.
can only betransferredif molecules are touching
is always created by friction
is a type of potential energy
is the same as temperature
What is the correct formula that would result from the combination of the two ionic species?
Cs¹+ and Cl¹-
Answer:
CsCl
Explanation:
The ionic species are:
Cs⁺ and Cl⁻
A reduction reaction involves either the addition of hydrogen or removal of:
Reduction involves the either the addition of hydrogen and removal of oxygen.
What is reduction?Reduction involves the removal of oxygen.
This implies there is a loss of oxygen in reduction.
This can be represented in the extraction of iron from it ores.
Fe₂O₃ + 3CO → 2Fe + 3CO₂
Reduction is also the addition of hydrogen. This implies it is the gain of hydrogen.
For example
CH₃CHO → CH₃CH₂OH
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An unidentified element has one electron in the outer most shell. Explain what
characteristics you would expect this element to have? Your response should include
three or four sentences
Answer:
They are unstable as single atoms, but can become stable by losing or sharing their one valence electron.
Explanation:
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What type of molecule is pentanal?
o a. aldehyde
o b. ester
o c. ketone
o d. alcohol
Answer:
aldehyde
Explanation:
it ends with "al" of "al"dehyde, always check the end
what are the most abundant metal in the earths crust from 1 to 10
Answer:
1. Oxygen - 46.1%
2. Silicon - 28.2%
3. Aluminium - 8.23%
4. Iron - 5.63%
5. Calcium - 4.15%
6. Sodium - 2.36%
7. Magnesium - 2.33%
8. Potassium - 2.09%
9. Titanium - 0.565%
10.Hydrogen -0.140%
Explanation:
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Find the magnetic force experienced by a proton moving with the speed of 3 × 105 m/s in the magnetic field B of magnitude 6 × 10-5 T.
The magnetic force experienced by a proton moving with a speed of 3 ×[tex]10^{5}[/tex] m/s in the magnetic field B of magnitude 6 ×[tex]10^{-5}[/tex] T will be 2.88×[tex]10^{-18}[/tex] N.
Magnetic force can be defined as the attraction or repulsion force that arises between electrically charged particles due to the motion of the charged particles.
Given,
Speed = 3×[tex]10^{5}[/tex] m/s
Magnetic Field, B= 6 ×[tex]10^{-5}[/tex] T
Magnetic force is the product of velocity, the charge of a proton, and the magnetic field present there.
The magnetic force can be represented as:
F=qvB
F=1.6×[tex]10^{-19}[/tex]×3×[tex]10^{5}[/tex] ×6 ×[tex]10^{-5}[/tex]
F=2.88×[tex]10^{-18}[/tex] N
Hence, the magnetic force experienced by the proton will be 2.88×[tex]10^{-18}[/tex] N.
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determine the enthalpy change when 7.08g of Ag is obtained. use the abbreviated form of the unit in your answer.
2AgBr(s) -> 2Ag(s) + Br2(l) deltaH = -220kJ
2AgBr(s) ⇒ 2Ag(s) + Br₂(l) ΔH = -220kJ ⇒ for 2 mol Ag
mol Ag = 7.08 : 108 g/mol = 0.065
the enthalpy change = 0.065/2 x -220 kJ = -7.15 kJ
An elemen belongs to group 17 of the periodic table. This element is most likely a.
Answer:
halogen
Explanation:
group 17 contains halogens
Answer:
The group 17 falls int he halogen category the element most likely Fluorine Chlorine Bromine Tennessine
Explanation:
Why did mendeleev leave blank spaces in his version of the periodic table?.
Explanation:
Answer:
Mendeleev left blank spaces in his version of the periodic table because he left the gaps to place elements not known at the time
: 2NaOH + H,S0A - Na,SO A + 2H,0 How many moles of sodium sulfate (Na,SO,) reproduced when 5.0 moles of sodium hydroxide (Na0H) are reacted with excess sulfuric acid? A 2.5 moles B 1.0 moles C 5.0 moles D 2.0 moles
From the reaction, we can see that the number of moles produced is 2.5 moles of Na2SO4
What is a reaction?Chemical reaction involves the combination between two or more species. In this case, the reaction equation is; 2NaOH + H2S04 ----> Na2SO4 + 2H20.
Now we are told that sulfuric acid is in excess hence NaOH is the limiting reactant.
If 2 moles of NaOH produces 1 mole of Na2SO4
5 moles of NaOH produces 5 moles * 1 mole/ 2 moles
= 2.5 moles of Na2SO4
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The theoretical yield of silver was
determined at 241 g Ag through
calculation. Instead, the reaction
generated only 192 g Ag. What is the percent yield of the reaction?
2AgNO3 + Zn → 2Ag + Zn(NO3)2
[?] %
Answer:
79.7%
Explanation:
Percentage yield = (actual yield/theoretical yield)*100%
Therefore percentage yield for this experiment is: [tex]\frac{192}{241} *100%[/tex]%
[tex]= 0.79668*100[/tex]%
Percentage yield = 79.668%
Rounded to 3 significant figures is 79.7%
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You examine an ice core sample from 10,000 years ago when global temperatures were unusually high. Based upon past studies and insights from current GHG levels, we expect that atmospheric levels of carbon dioxide Group of answer choices were high but methane levels were low. and methane were unusually low. and methane were unusually high. were low but methane levels were high.
Methane was unusually high is the correct option. Hence, option B is correct.
What is methane?Methane is the simplest member of the paraffin series of hydrocarbons and is among the most potent greenhouse gases. Its chemical formula is [tex]CH_4[/tex].
As the ice compacts over some time, tiny bubbles of the atmosphere or surroundings including greenhouse gases like carbon dioxide and methane—press inside the ice. These air pocket “fossils” give samples of what the atmosphere was kind when that layer of ice formed.
Based upon past studies and insights from current GHG levels, we assume that atmospheric levels of carbon dioxide and methane were unusually low.
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If air was not allowed to stream
through the kiln, how would the
production of lime be affected?
Explain your answer.
Answer:
The air flow carries away the carbon dioxide formed during the decomposition. Once accumulated in the furnace or if the air was not allowed to stream through, it begins to react again with the newly formed calcium oxide, equilibrating rather than completing the reaction.
Considering the combustion reaction of propane again, what mass of propane (C3Hg) is necessary to react with 4.53 g of oxygen? C3H8 +5023CO₂ + 4H₂O 0.0256 g C3H8 1.13 g C3H8 1.25 g C3H8 2.50 g C3H8
Answer:
1.25 g C3H8
Explanation:
edge lol
