How many moles of ammonium hydroxide are present in 140.0 g of the substance?
I believe the answer is 18.
Palmitic acid, derived from palm oil, is one of the most common fatty acids found in butter, cheese, milk, and meat.
a. True
b. False
Answer:
a. True
Explanation:
Palmitic acid is the acid found in animals and plants. It is the saturated acid that contains fats. It is extracted from palm oil and from fat sources like butter, cheese, milk and meat. It is added in milk with low fat content to add Vitamin A in it. The fat content of palmitic acid is very high. excessive consumption of palmitic acid leads to heart diseases and life risks.
Hydrogen gas is collected over water in an inverted buret. If the atmospheric pressure is 745 mm Hg, the vapor pressure of water is 18 mm Hg, and a 15.0 cm-high column of water remains in the buret, the pressure of the hydrogen gas is Hydrogen gas is collected over water in an inverted buret. If the atmospheric pressure is 745 mm Hg, the vapor pressure of water is 18 mm Hg, and a 15.0 cm-high column of water remains in the buret, the pressure of the hydrogen gas is:________
a. 745 mm Hg.
b. less than 727 mm Hg.
c. 763 mm.
d. 727 mm Hg.
Answer:
[tex]P_{H_2}=727mmHg[/tex]
Explanation:
Hello there!
In this case, according to the given data, it is possible to infer that the gas mixture lies on the 15.0 cm-high column of water, so that the total pressure or atmospheric pressure is given by:
[tex]P_{atm}=P_{water}+P_{H_2}[/tex]
Thus, since the atmospheric pressure is 745 mmHg and the vapor pressure of water is 18 mmHg, the pressure of hydrogen turns out to be:
[tex]P_{H_2}=P_{atm}-P_{water}\\\\P_{H_2}=745mmHg-18mmHg\\\\P_{H_2}=727mmHg[/tex]
Best regards!
At a pressure of 1 atm, the temperature 115.9 K is called the fill in the blank 1 of Kr . The normal boiling point for Kr is at K The triple point pressure for Kr is atm The critical pressure for Kr is 54.3 atm. At temperatures above 209.4 K and pressures above 54.3 atm, Kr is a _________ . Kr is a _________ at 50.3 atm and 105 K. Kr is a _________ at 0.720 atm and 131 K. Kr is a _________ at 1.00 atm and 118 K.
Answer:
melting point, 119.8 K, 0.72 atm, supercritical fluid, solid, gas, liquid.
Explanation:
Let's refer to the phase diagram (not to scale) for krypton.
At a pressure of 1 atm, the temperature 115.9 K is called the melting point of Kr, and it is the temperature at which it passes from solid to liquid.
The normal boiling point for Kr is at 119.8 K, which is, at 1 atm, the limit between the liquid and the gas state.
The triple point pressure for Kr is 0.72 atm, as can be seen in point C.
The critical pressure for Kr is 54.3 atm.
At temperatures above 209.4 K and pressures above 54.3 atm, Kr is a supercritical fluid, according to the region it is in the phase diagram.
Kr is a solid at 50.3 atm and 105 K, according to the region it is in the phase diagram.
Kr is a gas at 0.720 atm and 131 K, according to the region it is in the phase diagram.
Kr is a liquid at 1.00 atm and 118 K, according to the region it is in the phase diagram.
A 1.00 x 10^-10 M solution of chloric acid Please help me solve this to find pH and pOH
Answer: The pH of solution is 10.
The pOH of the solution is 4.
Explanation:
pH is the negative logarithm of concentration of hydrogen ion.
As given concentration of acidic solution is [tex]1.00 \times 10^{-10} M[/tex]. Therefore, pH of the solution is calculated as follows.
[tex]pH = -log [H^{+}]\\= -log (1.00 \times 10^{-10})\\= 10[/tex]
The relation between pH and pOH is as follows.
pH + pOH = 14
pOH = 14 - pH
= 14 - 10
= 4
Thus, we an conclude that pH of solution is 10 and pOH of the solution is 4.
Which planet is considered to be the most earth like despite the fact it has the hottest surface temperature?
Answer:
Venus
Explanation:
Similar in structure and size to Earth, Venus spins slowly in the opposite direction from most planets. Its thick atmosphere traps heat in a runaway greenhouse effect, making it the hottest planet in our solar system with surface temperatures hot enough to melt lead.
Answer:
Venus
Explanation:
Hope helps
The number of protons in an atom is known as its atomic
is scandium a transition metal?
Answer:no
Explanation:
Answer:
Scandium is a transition metal
Explanation:
7. Calculate moles of H2 needed to form 2.25 moles HCl in the reaction H2 + Cl2==>2HCl
Answer:
1.125 moles
Explanation:
2mole of HCl produced 1mole of H2
2.25moles of HCl will produce x moles
cross multiply
2x=™1×2.25
x= 2.25÷2
x=1.125mole
Which organisms in soil helps relieve element so they can be recycled
Answer:
Bacteria are also involved in many processes that are indispensable for our life on Earth. Many of these processes have to do with the recycling (reuse) of chemical elements that have been here since the formation of the planet
Explanation:
I hope it will help you
A 27.5g piece of aluminum sits in a room and cools. It loses 6120.0 J of heat. If the initial
temperature of aluminum is 157.3°C, what is the final temperature? The specific heat
capacity of aluminum is 0.900 J/gºC.
Answer:
[tex]T_2= -90.0°C[/tex]
Explanation:
Hello!
In this case, according to the given description of how the temperature changes for aluminum in agreement to the loss of heat of 6120.0 J, we can use the following equation:
[tex]Q=mC\Delta T=mC(T_2-T_1)\\\\[/tex]
Thus, by knowing Q, m, C and the initial temperature, we are able to obtain:
[tex]T_2=T_1+\frac{Q}{mC}\\\\T_2=157.3\°C+\frac{-6120.0J}{27.5g*0.900 J/g\ºC}\\\\T_2= -90.0°C[/tex]
Regards!
One way to measure ionization energies is ultraviolet photoelectron spectroscopy (UPS, or just PES), a technique based on the photoelectric effect. In PES, monochromatic light is directed onto a sample, causing electrons to be emitted. The kinetic energy of the emitted electrons is measured. The difference between the energy of the photons and the kinetic energy of the electrons corresponds to the energy needed to remove the electrons (that is, the ionization energy). Suppose that a PES experiment is performed in which mercury vapor is irradiated with ultraviolet light of wavelength 58.4 nm.
(a) What is the energy of a photon of this light in eV?
(b) Write an equation that shows the process corresponding to the first ionization energy of Hg.
(c) The kinetic energy of the emitted electrons is measured to be 10.75 eV. What is the first ionization energy of Hg in kJ/mol?
Answer:
Explanation:
From the given information:
The energy of photons can be determined by using the formula:
[tex]E = \dfrac{hc}{\lambda}[/tex]
where;
planck's constant (h) = [tex]6.63 \times 10^ {-34}[/tex]
speed oflight (c) = [tex]3.0 \times 10^8 \ m/s[/tex]
wavelength λ = 58.4 nm
[tex]E = \dfrac{6.63 \times 10^{-34} \ J.s \times 3.0 \times 10^8 \ m/s}{58.4 \times 10^{-9 } \ m}[/tex]
[tex]E =0.34 \times 10^{-17} \ J[/tex]
[tex]E = 3.40 \times 10^{-18 } \ J[/tex]
To convert the energy of photon to (eV), we have:
[tex]1 eV = 1.602 \times 10^{-19} \ J[/tex]
Hence
[tex]3.40 \times 10^{-18 } \ J = \dfrac{1 eV}{1.602 \times 10^{-19 } \ J }\times 3.40 \times 10^{-18 } \ J[/tex]
[tex]E = 2.12 \times 10 \ eV[/tex]
E = 21.2 eV
b)
The equation that illustrates the process relating to the first ionization is:
[tex]Hg_{(g)} \to Hg^+ _{(g)} + e^-[/tex]
c)
The 1st ionization energy (I.E) of Hg can be calculated as follows:
Recall that:
I.E = Initial energy - Kinetic Energy
I₁ (eV) = 21.2 eV - 10.75 eV
I₁ (eV) = 10.45 eV
Since ;
[tex]1 eV = 1.602 \times 10^{-19} \ J[/tex]
∴
[tex]10.45 \ eV = \dfrac{1.602 \times 10^{-19 } \ J }{ 1 \ eV}\times 10.45 \ eV[/tex]
Hence; the 1st ionization energy of Hg atom = [tex]1.67 \times 10^{-18} \ J[/tex]
[tex]1.67 \times 10^{-21} \ kJ[/tex]
Finally;
[tex]I_1 \ of \ the \ Hg (kJ/mol) = \dfrac{1.67 \times 10^{-21 \ kJ} \times 6.02 \times 10^{23} \ Hg \ atom }{1 \ Kg \ atom }[/tex]
[tex]\mathbf{= 1.005 \times 10^3 \ kJ/mol}[/tex]
How many liters of SO2 will be produced from 26.9L O2?
Answer:
26.9 L SO₂
Explanation:
Step 1: Write the balanced equation
S(s) + O₂(g) = SO₂(g)
Step 2: Establish the appropriate volume ratio
For gases at the same conditions, the volume ratio is equal to the molar ratio. The volume ratio of O₂(g) to SO₂(g) is 1:1.
Step 3: Calculate the liters of SO₂ produced from 26.9 L of O₂
We will use the previously established volume ratio.
26.9 L O₂ × 1 L SO₂/1 L O₂ = 26.9 L SO₂
The Swedish chemist Karl Wilhellm was the first to produce chlorine in the lab
2NaCl + 2H2SO4 + MnO2 -----> Na2SO4 + MnSO4 + H2O + Cl2
If Dr. Wilhellm started with 50.0 g of each reactant, which reactant is the limiting reactant?
Answer:
Explanation:
Remark
Interesting que8stion. You have to figure out how many mols are present in each reactant. Since all periodic tables are different, I'm going to use rounded numbers. If it is too close, I will go further.
NaCl
Na = 23
Cl = 35.5
1 mol = 58.5 grams
given = 50.0 grams
Mols for the reaction = 50/58.5 = 0.855
H2SO4
H2 = 2*1 2
S = 1 * 32 32
O4 = 4*16 64
1 mol = 98 grams
mols present = 50/98 = 0.510
MnO2
Mn = 1 * 55 = 55
O2 = 2*16 = 32
1 mol = 87 grams
mols available = 50/87 = 0.5747
Discussion
Na Cl and H2SO4 both require 2 moles for every mol of Cl2 produces.
H2SO4 has 0.51 mols available for a reaction
NaCl has 0.855 moles available for a reaction
MnO2 has 0.575 moles available for a reaction.
Given those numbers 0.510 mols of H2SO4 will only produce 0.255 mols of chlorine and the rest will be reduced in a similar manner. H2SO4 is the limiting reagent (reactant).
In other words only 0.510 moles of NaCl will be used and 0.855 - 0.510 moles will be left over on the reactants side.
only 0.575 moles of MnO2 will be used and 0.065 moles will be left over.
The oddity in the result shows up because the balance numbers in the equation give a ratio of 2 to 1 for H2SO4 and NaCl The 2 belongs to the reactants and the 1 for the chlorine.
Mechanical digestion begins in the_____ and involves physical processes, such as chewing.
Answer:
begins in the mouth
A___
is a
small, rocky object
that orbits the sun
and has broken
off from a comet
or asteroid.
(Fill in the blank)
Answer:
I think it is a rock...
Explanation:
maybe idrk tho
How many liters of SO2 will be produced from 26.9L O2?
Answer:
26.9L of SO2
Explanation:
The reaction between Sulphur and oxygen is as follows:
[tex]S_2 + 2O_2 \to 2SO_2[/tex]
This implies that:
2 moles of oxygen reacts with 1 mole of sulphur to produce 2 moles of SO₂
2 moles of oxygen also yields 2 moles of SO₂
The number of moles of oxygen given is determined as:
[tex]= 26.9 \ L \ of \ O _2 \times (\dfrac{1 \ mol \ of O_2 }{22.4 \ L}) \\\\ = 1.20 \ mol \ of \ O_2[/tex]
The number of moles of SO₂ by using the ratio is:
[tex]= 1.20 \ mol \ of \ O_2 \times (\dfrac{1 \ mol \ of \ SO_2 }{1 \ mol \ O_2}) \\ \\ = 1.20 \ mol \ of SO_2[/tex]
Finally, the volume by applying the new moles is computed as:
[tex]= 1.20 \ moles \ of \ O_2 \times ( \dfrac{1 \ mo \ of \ SO_2}{1 \ mol \ of O_2}) \times ( \dfrac{22.4 }{1 \ mol }) \\ \\ = 26.9 \ L \ of \ SO_2[/tex]
Which type of metal ions tends to absorb light in the visible range?
Transition metal ions tends to absorb light in the visible range.
What are Transition Metals?Transition metal is defined as an element having a d subshell that is partially filled with electrons, or an element that has the ability to form stable cations with an incompletely filled d orbital.
The transition metals are located towards the middle of the periodic table between the highly reactive metals and the noble gases.
They are the only elements that may use electrons in the next to highest—as well as the highest—energy level as valence electrons.
Transition metals are unusual in having very similar properties even with different numbers of valence electrons.
Therefore, Transition metal ions tends to absorb light in the visible range.
Learn more about Transition metals, here:
https://brainly.com/question/29828769
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Thorium-236 has a half life of 10.0 minutes.If I have 250 grams of Thorium-236 , how many half lives will have taken place after 50.0 minutes?
Answer:
5 half lives
Explanation:
Given that
Thorium - 236 contains the half-life of 10.0 minutes
And there is 250 grams
We need to find out the number of half lives that took place after 50.0 minutes
As in the question
1 half life is 10 minutes
So for 50 minutes, it would be
= 50 minutes × 1 half life ÷ 10 minutes
= 5 half lives
Rubbing alcohol and vegetable oil soluble on insoluble?
How many hydrogen molecules are in h2
Answer:
two
Explanation:
The symbol “H” means the hydrogen atom; “2H” means two hydrogen atoms that do not make a molecule: they are just two separate (individual) atoms; “H2” means the hydrogen molecule (two hydrogen atoms that came together, sharing their electrons); “2H2” means two separate hydrogen molecules.
WILL GIVE BRAINLIEST!!!
Answer:
The answer is B
Explanation:
The answer is B because representative particles can only be atoms.
What is the IUPAC name of the following compound?
Answer:
2,6–dimethylcyclohexanol
Explanation:
To name the compound given in the question above, we must first obtain the following:
1. Determine the functional group of the compound.
2. Locate the longest continuous carbon chain.
3. Identify the substituent group attached to the compound.
4. Locate the position of the substituent group.
5. Combine the above to obtain the name of the compound.
Now, we shall determine the name IUPAC name of the compound. This can be obtained as follow:
1. The compound contains the –OH group. Thus, the compound is an alcohol.
2. The compound is a cyclic compound with six carbon forming the ring. Thus, the parent name of the compound is cyclohexane. Thus, the presence of the –OH group changes the parent name of the compound to cyclohexanol.
3. The substituent group attached to the compound is methyl (–CH₃)
NOTE: There are two –CH₃ groups attached to the compound.
4. The position of the 1st –CH₃ group is at carbon 2, while the 2nd is at carbon 6.
NOTE: Counting is done from the carbon bearing the functional group.
5. Therefore, the name of the compound is:
2,6–dimethylcyclohexanol
A body of mass 0.5kg is thrown vertically upwards
from the ground with an Initial velocity of 80.m/s
Calculate
" the potential energy at B 80.0cm above the ground
Here's the solution,
we know,
potential energy = mgh
where,
m = mass = 0.5 kgg = acc due to gravity = 9.8 m/s²h = height = 0.8 m (80 cm)So,
=》
[tex]p.e = 0.5 \times 9.8 \times 0.8[/tex]
=》
[tex]p.e = 3.92 \: \: joules[/tex]
Determine the number of electrons in an Cl ion with a charge of -3
Answer:
There are 20 electrons.
Explanation:
Chlorine has 17 electrons in its atom to begin with (you can tell from the proton number in the periodic table).
A charge of -3 means that the chlorine atom gained 3 electrons, and now needs to lose 3 electrons to return to its atom configuration.
What is the total number of protons, neutrons, and electrons in a cadmium, Cd, atom that has a mass number of 112?
Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.
Answer:
Number of Protons 48
Number of Neutrons 64
Number of Electrons 48
Explanation:
The mass number of an atom is the sum of the number of protons and neutrons in the nucleus of that atom
lonic bonding can only occur between which two types of elements
a
Metal and metal
b
non metal and non metal
c
metal and non metal
d
none of the above
Answer:
C.
Explanation:
An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed between a cation, which is usually a metal, and an anion, which is usually a nonmetal. A covalent bond involves a pair of electrons being shared between atoms.
Determine the number of moles of CH3Br in 47.5 grams of CH3Br?
Show Work please - NO LINKS
Answer:
0.500 moles
Explanation:
In order to convert grams of any given substance into moles, we need the substance's molar mass:
Molar Mass of CH₃Br = Molar Mass of C + (Molar Mass of H)*3 + Molar Mass of BrWe can find the molar masses of each element in the periodic table:
Molar Mass of CH₃Br = 94.94 g/molNow we can divide the given mass by the molar mass in order to calculate the number of moles:
47.5 g ÷ 94.94 g/mol = 0.500 molesThink about the decomposition reaction of ozone.
2 O3 ----> 3 O2
If 71.7 mol ozone are in this reaction, what is the theoretical yield of O2 (in gram)?
Answer:
3441.6 grams.
Explanation:
2 O₃ → 3 O₂
First we convert 71.7 moles of ozone (O₃) into moles of oxygen gas (O₂), using the stoichiometric coefficients of the reation:
71.7 mol O₃ * [tex]\frac{3molO_2}{2molO_3}[/tex] = 107.55 mol O₂
Then we convert 107.55 moles of O₂ into grams, using the molar mass of O₂:
107.55 mol * 32 g/mol = 3441.6 g
1. Density is the measure of how much
volume ?????? is contained in a given volume
Explanation:
Density is the mass of an object divided by its volume. Density often has units of grams per cubic centimeter (g/cm3). Remember, grams is a mass and cubic centimeters is a volume (the same volume as 1 milliliter).
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