Answer:
Selenium trisulfide
The partial pressures of CH4, N2, and O2 in a sample of gas were found to be 248 mm Hg, 707 mm Hg, and 518 mm Hg, respectively. What is the mole fraction of Nitrogen gas?
total pressure=248+707+518=1473mmHg
partial pressure=total pressure×mole fraction
mole fraction of N2
=partial pressure of N2/total pressure
=707mmHg/1473mmHg
=0.4800
A person who controls access to the decision maker is called a(n)
Answer:
Wdym?
Explanation:
I don't understand this question
Answer:
gatekeeper
Explanation:
PLEASE HELP!
1) What type of reaction is this?
Zn + 2HCl -----> ZnCl + H
2) Balance the equation (Hint, you need to balance the left side with the right side)
1) single replacement
2) Zn + 2HCl -----> ZnCl + H
equation is already balanced
When the equation H2 + Fe3O4 = Fe + H2O is completely balanced using the smallest whole numbers, the coefficient oH2 would be A.) 1 B.)2 C.) 3 D.) 4
Answer:
H2 would have a coefficient of 2.
Explanation:
According to the balanced chemical equation, the coefficient of hydrogen is 4.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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CHEM help
i know how to report random answers btw
Answer:
ionic, they would make an ion
Explanation:
Look at this glass of soda. Use your knowledge of thermal energy transfer to explain how heat is affecting the following things: ice, soda, glass, and surrounding air.
Explanation:
Technically, the ice cube melts because the water cools down. This may sound ridiculous at first, but you must consider the fact that the ice melts because it has drawn "heat" (energy) from its surroundings. The "surroundings" being the air and water that surround it (but the water's more important since it's a better conductor of thermal energy).
The surrounding air looses energy while the ice in the glass gains energy.
We know that thermal energy is transferred from a hotter body to a cooler body. If we look as the glass, we will notice that the surrounding air has a greater energy compared to the contents of the glass. The surrounding air looses this energy resulting in the condensation of water vapor in air around the glass.
Similarly, the ice in the glass gains energy and melts. A change of state occurs from solid to liquid as a result of the energy absorbed from the surrounding air.
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What statements are true about mutations to DNA?
Answer:
Is this a general question or is there supposed to be a picture
Explanation:
7. Where do amino acids reside ?
Answer:
Explanation:
Polar side chains tend to be present on the surface of a protein where they can interact with the aqueous environment found in cells. On the other hand, non-polar amino acids tend to reside within the center of the protein where they can interact with similar non-polar neighbors.
4. For water, H20 represents
only the empirical formula
only the molecular formula
only the structural formula
both the empirical & molecular formulas
Answer:
The empirical and molecular formula because the ratio is 2:1 and there is 2 hydrogen atoms and 1 oxygen atom.
Hope this helps!
You have 54.32 grams of PbCl4. How many moles of PbCl4 do you have?
If you show the work that would be great!
One mol of air contains 0.74 moles of nitrogen gas and 0.25 mol of oxygen gas. Compute the partial pressure of these gases at a total pressure of 1.7 atm and at a total pressure of 4.7 atm.
Explanation:
Partial pressure of a gas is the product of the mole fraction of that gas, which is the ratio of the no. of moles of the gas to the total no. of moles, and the total pressure.
total no. of moles=0.74+0.25=0.99 mol
mole fraction of N2=0.74/0.99=0.7475
mole fraction of O2=0.25/0.99=0.2525
total pressure=1.7+4.7=6.4 atm
partial pressure of N2=0.7475×6.4=4.784 atm
partial pressure of O2=0.2525×6.4=1.616 atm
Giving brainliest! Please help pleaseeee
Answer:
Id want to know how the nucleus looks like upclose, is it really that neutrons and protons are bond together, or are they just sticking in together. I'd also wanna look at electrons, or even possible hold them so that i can see the mass it really has
Explanation:
What causes dipole interactions?
bonding of a covalently bonded hydrogen to an unshared electron pair
attraction between ions
attraction between polar molecules
sharing of electron pairs
3 Module 1 - Lessons
Dashboard
Ready
C levertal
Infinite can
& 2nd
the amount of mass in a given space
What is the difference between a pure solvent and a solution? Do they have the same physical properties?
Answer:
The physical properties of a solution are different from those of the pure solvent. ... Colligative properties are those physical properties of solutions of nonvolatile solutes that depend only on the number of particles present in a given amount of solution, not on the nature of those particles.
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Name this alkane.
A five-sided polygon with one point facing left. A straight line extends from that point, then a line slanting up to the left, then another straight line extends left.
propylcyclopentane
pentylpropane
nonacyclotane
phenylcyclopentane
Answer:
propylcyclopentane
Explanation:
The rest Are swiggly lines and more than 5 sides
The organic compounds which consist of single bonded carbon and hydrogen atoms are called alkanes. They are also called the saturated hydrocarbons. Here the given alkane is propylcyclopentane. The correct option is A.
What is propylcyclopentane?The propylcyclopentane is an alkane which is the simplest family of hydrocarbons. It is a cyclic hydrocarbon which acts as the major component of gasoline and it is also used in the manufacture of synthetic resins and rubber adhesives.
The propylcyclopentane is an important cycloalkane which contains five carbon atoms bonded to two hydrogen atoms above and below the plane. It appears as a clear colourless liquid with a petroleum like odor. It is less dense than water and it is insoluble in water.
Propylcyclopentane is a member of cyclopentanes, a cycloalkane and a volatile organic compound. Its molecular formula is C₈H₁₆. It can also be called as 1 - Cyclopentylpropane.
Thus the correct option is A.
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An organism from the past that is related to all the organisms in the group is called?
Answer:
phylogenic trees/phylogeny
Explanation:
the evolutionary history and relationship of an organism or group of organisms is called its phylogeny
1N2 + 3H2 -->
2NH3
When 23.15 g of N, and 36.85 g of H2 react, what is the maximum amount of NH3 that can be produced?
Answer:
28.23 g NH₃
Explanation:
The balanced chemical equation is:
N₂(g) + 3 H₂(g) → 2 NH₃(g)
Thus, 1 mol of N₂ reacts with 2 moles of H₂ to produce 2 moles of NH₃. We convert the moles to mass (in grams) by using the molecular weight (MW) of each compound:
MW(N₂) = 2 x 14 g/mol = 28 g/mol
mass N₂= 1 mol x 28 g/mol = 28 g
MW(H₂) = 2 x 1 g/mol = 2 g/mol
mass H₂ = 3 mol x 2 g/mol = 6 g
MW(NH₃) = 14 g/mol + (3 x 1 g/mol) = 17 g/mol
mass NH₃= 2 moles x 17 g/mol = 34 g
Now, we have to figure out which is the limiting reactant. For this, we know that the stoichiometric ratio is 28 g N₂/6 g H₂. If we have 36.85 g of H₂, we need the following mass of N₂:
36.85 g H₂ x 28 g N₂/6 g H₂ = 171.97 g N₂
We have 23.15 g N₂ and we need 171.97 g. So, we have lesser N₂ than we need. Thus, the limiting reactant is N₂.
Now, we calculate the product (NH₃) by using the stoichiometric ratio 34 g NH₃/28 g N₂, with the mass of N₂ we have:
23.25 g N₂ x 34 g NH₃/28 g N₂ = 28.23 g NH₃
Therefore, the maximum amount of NH₃ that can be produced is 28.23 grams.
Calculate the approximate initial boiling point (in oC) of a solution of 285 g of
magnesium chloride in 2.0 kg of water. The kb of water is (0.52°C/m)
Answer:
do u take links bcs I can give u one with the answer?
The approximate initial boiling point of Magnesium chloride solution has been 102.33 degree Celsius.
The pure water has boiling point 100 degree Celsius. With the addition of the solvent, the boiling point has been increased. The change in the boiling point ([tex]\Delta T_b[/tex]) has been given as:
[tex]\Delta T_b=i.K_b.b[/tex]
Where, i has been the van't Hoff factor
[tex]K_b[/tex] has been the ebullioscopic constant
b has been the molality of the sample
The dissolution of magnesium chloride in water has been given as:
[tex]\rm MgCl_2\;(aq)\;\rightarrow\;Mg^2^+\;+\;2\;Cl^-[/tex]
The i has been the amount of molecules that has been formed by the dissociation of 1 molecule. The dissociation of Magnesium chloride has been resulted in the 1 Mg and 2 Cl. Thus, the i for Magnesium chloride has been 3.
The molality (m) of the solution has been given as:
[tex]m = \dfrac{m_s_o_l_u_t_e}{mwt}\;\times\;\dfrac{1000}{m_s_o_l_v_e_n_t}[/tex]
Where, [tex]m_s_o_l_u_t_e=285\;\text {g}\\m_s_o_l_v_e_n_t=2\;\text{kg}\\mwt=95.211\;\text{g/mol}[/tex]
Substituting the values, molality of the Magnesium chloride solution (b) can be given as:
[tex]b=\dfrac{285}{95.211}\;\times\;\dfrac{1}{2}\;\text{m}\\b=1.49\;\text{m}[/tex]
The molality of the solution has been 1.49 m.
Substituting the values for change in temperature:
[tex]\Delta T_b=3\;\times\;0.52\;\times\;1.49\;^\circ \text C\\\Delta T_b=2.33\;^\circ \text C[/tex]
The rise in boiling temperature with the addition of 285 g of Magnesium chloride has been 2.33 [tex]\rm ^\circ C[/tex]. Since, the initial temperature for pure solvent has been 100 degree Celsius.
The initial temperature of Magnesium chloride solution has been the sum of two. Thus:
[tex]\text {Initial temperature}=100^\circ \text C\;+\;2.33\;^\circ \text C\\\rm Initial\;temperature=102.33\;^\circ C[/tex]
The initial temperature of magnesium chloride solution has been 102.33 degree Celsius.
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What is the number of moles of H2 produced when 23 g of sodium react with water according to the equation 2Na(s) + 2H2O(l) 2NaOH(aq) + H2(g)
Answer:
0.5 mole of H₂.
Explanation:
We'll begin by calculating the number of mole in 23 g of Na. This can be obtained as follow:
Mass of Na = 23 g
Molar mass of Na = 23 g/mol
Mole of Na =?
Mole = mass / Molar mass
Mole of Na = 23 / 23
Mole of Na = 1 mole
Next, the balanced equation for the reaction.
2Na + 2H₂O —> 2NaOH + H₂
From the balanced equation above,
2 moles of Na reacted to produce 1 mole H₂.
Finally, we shall determine the number of mole of H₂ produced by the reaction of 23 g (i.e 1 mole) of Na. This can be obtained as follow:
From the balanced equation above,
2 moles of Na reacted to produce 1 mole H₂.
Therefore, 1 mole of Na will react to produce = (1 × 1) / 2 = 0.5 mole of H₂.
Thus, 0.5 mole of H₂ is obtained from the reaction.
A 5.00 L flask contains 7.94 g of a gas at STP. What is the molar mass of the gas?
Answer: 35.6 g/mol
Explanation: I guessed and got it correct
The molar volume of any gas behaving ideally at STP is 22.414 L. The molar mass of the gas at STP is 35.59 g.
What is molar mass?The molar mass of a substance is defined as the mass of one mole of molecules. In other words one gram molecular mass of a substance is same to its molar mass in g mol⁻¹.
The molar mass of a substance can be obtained by adding the atomic masses of each elements. At 0°C and 1 atm, 1 mole of any gas behaving ideally occupies a volume of 22.414 L.
Here 5.00 L of the gas at STP has a mass of 7.94. Then the molar mass of 22.414 liters of the gas can be calculated as:
7.94 × 22.414/5.00 = 35.59 g.
Thus the molar mass of the gas is 35.59 g.
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what is the formula of the compounds in B
pls help
Answer:
PCl3
Explanation:
The molecular formular of a compound shows the exact number of atoms of elements present in the compound. In this illustration, there is one atom of P and 3 atoms of Cl.
The formular is given as; PCl3
Answer:
PCl³
Explanation:
because there are 1 phosphorus atom and 2 chlorine atom.
in which of the following is number of neutrons correctly represented?
Answer:
²³⁸₉₂U has 146 neutrons
Explanation:
To know which option is correct, we shall determine the number of neutrons in each case. This can be obtained as follow:
For ²⁴₁₂Mg:
Mass number (A) = 24
Proton number (P) = 12
Neutron number (N) =?
A = P + N
24 = 12 + N
Collect like terms
N = 24 – 12
N = 12
Thus, there are 12 neutrons in ²⁴₁₂Mg
For ⁷⁵₃₃As:
Mass number (A) = 75
Proton number (P) = 33
Neutron number (N) =?
A = P + N
75 = 33 + N
Collect like terms
N = 75 – 33
N = 42
Thus, there are 42 neutrons in ⁷⁵₃₃As
For ¹⁹₉F:
Mass number (A) = 19
Proton number (P) = 9
Neutron number (N) =?
A = P + N
19 = 9 + N
Collect like terms
N = 19 – 9
N = 10
Thus, there are 10 neutrons in ¹⁹₉F.
For ²³⁸₉₂U:
Mass number (A) = 238
Proton number (P) = 92
Neutron number (N) =?
A = P + N
238 = 92 + N
Collect like terms
N = 238 – 92
N = 146
Thus, there are 146 neutrons in ²³⁸₉₂U
Considering the options and the illustration made above, Only ²³⁸₉₂U has the correct number of neutrons written along side.
28g of aluminum reacts with 45g oxygen
1) complete balanced equation?
2) what is the limiting reactant?
3) how many grams of product could be formed?
4) how many grams of excess would you predict?
5) if you actually measured 50g of product, what is the percent yield?
Answer:
answer below:
Explanation:
1) 4 Al + 3 O2 --> 2Al2O3.
2) Al mol= 28/27 = 1.037mol
O mol= 45/16 = 2.812mol
Al : O
4 : 2
x : 2.812
cross multiply
4 x 2.812/2 = 5.624 mol of Al
Al is limiting reactant
3) 28/5.246 = 5.34product can be formed (not that much sure)
4) 45/ 0.5185 = 86.79
86.79 - 5.34 = 81.45g
5) 50 / 81.45 x 100 = 61.39% ( i guess)
i hope this hleps you
Which of the following is the best definition of frequency in waves?
How many waves pass a given point in 1 second.
How often waves of a certain sound are used in the air
The distance from the middle of the wave to the top of the crest
The distance from the crest of 1 wave to the crest of the next
what do you need to know
how does pentene become pentane?
How does propene become propane?
i really need these solved, it’s asking for half equations!!
Answer:
Net equation: Cu + 2Ag+ ⇒ 2Ag + Cu2+
Explanation:
Cu + 2N03- + 2Ag+ ⇒ 2Ag + 2NO3- + Cu2+
The 2NO3- cancel out since they're spectator ions
∴ Cu + 2Ag+ ⇒ 2Ag + Cu2+
Half equations are:
Cu ⇒ Cu2+
2Ag+ ⇒ 2Ag
Balancing both sides of each equation with electrons will lead back to the Net equation.
How many moles are in 5.30 X 1023 molecules of H2O?
Answer:
0.880 (0.88039867109 to be exact)
Explanation:
To convert from molecules to moles, simply divide by Avogadro's number which is 6.02 x 10^23
So, 5.30x10^23/6.02x10^23 = 0.880
What is the correct IUPAC name for the acid: H2Lv