Help help help please

  3.5 × 10^6 g

according to ideal gas equation, PV = nRT

where, p is pressure v is volume, n is mole of gas, r is gas onstant and t is temperature.

Pressure (p) = 741 Torr = 1 bar

Volume (V) = 5.40 ml= 0.0054litre

Amount of substance (n)  mol = ?

Temperature (T)  44°C= 371kelvin

so by putting all values in equation. PV = nRT

         = 1 ×  0.0054 =n ×8.31 ×371

         n ≈ 0.000002 = 2.0 × 10^-6

now, n is mole of gase,

mole = given mass ÷ molecular mass

given mass = 7.10g

molecular mass = given mass ÷ mole

                         7.10 ÷ 2.0 × 10^-6

                  = 3.5 × 10^6 g

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Answer:

a

Explanation:

because this could be down to coincidences whereas the others could be explained with scientific experiments

Answer:

A

Explanation:

Must be testable - A is not

Answer:To find the volume of a rectangular prism, we multiply the length of the prism by the width of the prism by the height of the prism.


honeslty

Explanation:

The following best describes a community

community is best describes as  An interacting group of populations that occupy the same area

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The calculated medication dose is 3.010³g/kg

Patients receive medications either as a dosage or as a single dose. These two terms have various connotations. A dosage is a set amount of medication administered all at once. It is a singular value for mass or volume. It can alternatively be described as the mass or volume of the medicine divided by the patient's body weight. A drug's dosage is the precise quantity, number, and frequency of doses given over a precise period of time.

The dose (one time) of medication for an adult patient is the subject of this question. The patient mass is given in pounds, and the drug mass is supplied in milligrams; m drug = 200 mg

145 lbs., patient

In order to respond to this query, we convert the patient's mass to kilograms and the drug mass to micrograms:

Drug = 200 mg, 10³ mg, and 2.00, 10⁵ g

145 lb patient = kg/2.20 lb = 65.9 kg

The medication dose is:

mdrug Mpatient = 2.0010⁵g/65.9kg

= 3.010³g/kg

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Answer:true

Explanation:

if you change the sequence, the answer you get may be wrong.

Magnesium is not a good conductor. Hence, the conductivity of magnesium is not good.

Magnesium is placed in group 2 of the periodic table. It has 2 valence electrons which are in the fully filled s-subshell. When the subshell is fully filled, the electrons are not available to move to conduct. For example, group 1 has half filled subshell which allows the electrons to move.

But, how does magnesium conduct? As its subshell is fully filled and therefore no electrons are available to move.

In group 2 metals, there is a property called s-p hybridization. The s- and p- subshells overlap so that metals can now move to the unfilled states of the p-subshell.

Hence, magnesium is not a good conductor.

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Line spectrum of hydrogen atom in Lyman series is formed​ 'absorbs energy and gets excited'

The electron in a hydrogen atom absorbs energy and gets excited and the electron jumps from a lower energy level to a higher energy level and when it comes back to its original state, it gives out energy which forms a hydrogen spectrum and the line in Lyman series is formed​ by electronic transition and all the wavelengths in the Lyman series are in the ultraviolet band and this are seen in ultraviolet emission lines of the hydrogen atom as an electron goes from n ≥ 2 to n = 1 where n is the principal quantum number and the lowest energy level of the electron.

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1. The empirical formula of the weak acid is H₂PO₃

2. The molecular formula of the weak acid is H₄P₂O₆

The empirical formula of the compound can be obtained as follow:

Divide by their molar mass

H = 0.0220 / 1 = 0.022

P = 0.3374 / 31 = 0.01

O = 0.5227 / 16 = 0.03

Divide by the smallest

H = 0.022 / 0.01 = 2

P = 0.01 / 0.01 = 1

O = 0.03 / 0.01 = 3

Thus, the empirical formula of the compound is H₂PO₃

Molecular formula = empirical × n = mass number

[H₂PO₃]n = 162

[(1×2) + 31 + (16×3)]n = 162

81n = 162

n = 162 / 81

n = 2

Molecular formula = [H₂PO₃]n

Molecular formula = [H₂PO₃]₂

Molecular formula = H₄P₂O₆

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Answer:

Electron,

Neutron,

Proton,

& the nucleus

Explanation:

Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day!

The specific heat capacity of a substance, also known as the massic heat capacity or massic heat capacity in thermodynamics, is the heat capacity of a sample of the substance divided by the mass of the sample. So, the energy gain by sample will be 506J

We know that, the heat energy gained will be calculated by the formula,

Q=mcΔT

where,

Q= Heat energy gained

m=mass

c= specific heat capacity

ΔT= Change in temperature

So, Given,

m= 5.00g ,

ΔT= 419K -306K= 113K

c= 0,897J/gK

Q=mcΔT

Q= 5.0×0.897×113

Q= 506J

So, the energy gained by sample of Aluminum will be 506 J when it is warmed from 306 K to 319K , in which temperature difference is 113K

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The volume of the gas at 100K If 1 liter of gas at 300 K is cooled to 100K is 0.33L.

The volume of a gas can be calculated using the following formula:

V1/T1 = V2/T2

Where;

According to this question, a gas is in a flexible container. If 1 liter of gas at 300K is cooled to 100K. The volume of the gas is calculated as follows:

1/300 = V2/100

100 × 1 = 300V2

100 = 300V2

V2 = 100/300

V2 = 0.33L

Therefore, the volume of the gas at 100K If 1 liter of gas at 300 K is cooled to 100K is 0.33L.

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Answer:  [D]:  " 75 g of salt in 100 mL of water. "

____

Explanation:

         By looking at the answer choices—we can tell that all 4 (four) values for the "solvent"—[in this case: "100 mL of water".].

Note:  As a general rule—and at this point in our problem—
The answer would be:
           The solution with the most 'concentration' of solute—per the same volume of solvent—would be the most 'concentrated' solution—
would be Answer choice:  [D]:  " 75 g of salt in 100 mL of water."

Note:  Answer Choice:  [D]—has the most solute (grams of salt)—compared with the 'other values' given in the 'other' answer choices.
       →   Specifically, refer to the other answer choices:

            →  " [D:  75 g]   >   [C:  50 g]   >   [B:  40 g]   >  [A:  35 g ] ".
____
            Wishing you well in your academic pursuits—and within the "Brainly" Community" !
____

The correct answer is 329.4 Cal.

Remember that specific heat is the ratio of the amount of heat needed to raise a body's temperature by one degree compared to the amount of heat needed to raise the temperature of an equivalent mass of water by one degree, or that specific heat capacity is the amount of heat energy needed to raise a material's temperature by one kelvin (K) per kilogramme.

Mass of sample=50.00-g

Specific heat of metal=0.108 cal/g °C

Change in temperature=78.0 °C-17.0°C=61.0°C

Heat Released by metal can be calculated as follows:

Heat Released = Mass of sample  x Specific heat x  Change in temperature

Heat Released = 50.00 g x  0.108 cal/g °C x 61.0°C

Heat Released = 329.4 Cal

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The planet’s diameter would be approximately the distance across the United States Mercury.

What is planet mercury known for?

Therefore, The planet’s diameter which would be approximately the distance of the United States is Mercury.

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Explanation:

The first involves keeping the surface of the concrete moist by the use ponding, spraying/sprinkling, damp sand or damp hessian.

The second prevents the loss of moisture from the concrete by covering it with polythene sheeting or leaving the formwork in place.

The third involves the use of spray or roller applied curing compounds.

Explanation:

make up some of your own signs which can warns people about the dangers of river an ocean a large snake hiding in the bush

Aliphatic compounds, on the other hand, are organic substances whose carbon atoms link with one another in open chains, either straight or branched, as opposed to containing a benzene ring. Aromatic compounds are organic substances with a planar unsaturated ring of atoms that is stabilized by an interaction of the bonds forming the ring. As a result, the primary distinction between aromatic and aliphatic chemicals is that aromatic compounds lack a cyclic structure while aliphatic compounds have straight, branching, or cyclic structures. Additionally, while the majority of aliphatic molecules are odorless, all aromatic compounds have a sweet, pleasant fragrance.

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Answer: Protects your eyes from chemical splashes, Must be worn during all labs, from start to lab checkout, in which chemicals, glass or heating of substances is involved. No exceptions!!

4.80 grams of oxygen will be release.

When heated in a closed container in the presence of a catalyst, potassium chlorate decomposes into potassium chloride and oxygen gas via the following reaction:

2KClO3(s) → 2KCl(s)+ 3O2(g)

mass of potassium chlorate   = 12.25g

mole of KClO3 = 12.25/122.5 = 0.1 mol

2 mole KClO3 (consumed) = 3 mole O2 (produced)

1 mole KClO3 = 3/2 mole O2

0.1 mole KClO3 = 0.1*1.5 mole O2

                          = 0.15 mole O2

mass of O2 = 0.15 * 32 = 4.80 grams

4.80 grams of oxygen will be release.

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Ferric chloride combines with water in a reversible reaction to produce ferric hydroxide and hydrochloric acid as shown.

[tex]FeCl_{3}[/tex] + 3H₂O → [tex]Fe(OH)_{3}[/tex] +  3HCI

The reaction which must occur at the same time as the formation of ferric hydroxide are given below .

[tex]FeCl_{3}[/tex]  → Fe · + Cl ·

So , option C is correct one .

The water ionizes to hydrogen and hydroxide ions and the ferric chloride in the water ionizes to iron, or ferric and chloride ions. As a result, the solution becomes more hydrogen ion-rich than it was before the precipitation, which causes the solution to become acidic.

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Answer:

The real answer is Fe(OH)3 + 3HCI - FeCl3 +3H2O

Explanation:

I took the test and this was the correct answer.

Atoms can not be divided is the incorrect idea in Bohr’s understanding of the atom.

Bohr believed that electrons circled the nucleus in orbits. According to current atomic theory, electrons don't follow predetermined routes.

Bohr believed that electrons traveled in circular paths around the nucleus, but current theory suggests that the structure of atomic electrons is more to 3D standing waves.

Bohr improved on Rutherford's atomic model. The majority of the atom's mass is concentrated in its nucleus, which we now refer to as the center of the atom, and electrons surround the positive mass in a manner to a cloud. Bohr's use of the quantification energy to explain the model was his most important contribution. According to his theories, electrons circling the nucleus have quantized potential and kinetic energies.

The Heisenberg Uncertainty Principle is first violated by the Bohr model because it assumes that electrons have a known orbit and radius. The Bohr Model is less effective at drawing diagrams of larger atoms and gives an incorrect value for the ground state orbital angular momentum.

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The event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is  Dune movement.

The sand mass of dunes can move either windward or leeward, depending on if the wind is making contact with the dune from below or above its apogee.

If wind hits from above, the sand particles move leeward; the leeward flux of sand is greater than the windward flux.

Thus, the event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is  Dune movement.

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Answer:

b

Explanation:

ason solved this problem by changing 6/4 to 1.2. He then added 1.2 to 0.68 and got 1.88.

This answer is incorrect. What did he do wrong?

The value of the rate constant at 820.0 K is 0.2 s^-1

Applying the Arrhenius equation, which is...

k = Ae-Ea/RT

Applying the formula, we get

lnk2 = lnk1 - (Ea/R)(1/T2 - 1/T1)

Applying the values, we get

ln k2 = ln 6.1x10^-8 - (2.62x10^3/8.314)(1/820 - 1/600)

Calculating the value, we get...

ln k2 = -0.31

Taking power e, we get

k2 = 0.2 s^-1

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Density is a physical property that relates the mass of a substance with the volume occupied by the mass of the substance. The density of the substance can be used to examine the purity of the substance.

Explanation:

In a chemical reaction, the atoms and molecules that interact with each other are called reactants. In a chemical reaction, the atoms and molecules produced by the reaction are called products. In a chemical reaction, only the atoms present in the reactants can end up in the products.

Answer:

In a chemical change, the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants. When a new substance is formed, the change is called a chemical change.

Explanation:

Chemical changes occur when bonds are broken and/or formed between molecules or atoms. This means that one substance with a certain set of properties (such as melting point, color, taste, etc) is turned into a different substance with different properties.

A chemical element that has an atomic number less than 58 and an atomic mass greater than 135.6m is barium (atomic no. 56 and atomic mass137.13 ) and lanthanum (atomic no. 57  and atomic mass 135.6).

Barium is an element with the symbol Ba and atomic number 56. It is an alkaline earth metal that is soft and silvery, and it is the fifth element in group 2. Barium is never found in nature as a free element due to its extreme chemical reactivity. Oil well drilling fluid uses barium sulfate as an insoluble ingredient. It is employed as an X-ray radiocontrast agent in a purer form to image the human gastrointestinal tract. Barium compounds that dissolve in water have been employed as rodenticides despite being hazardous.

Chemical element lanthanum has the atomic number 57 and the symbol La. It is a silvery-white, ductile, soft metal that slowly tarnishes when exposed to air. It serves as the eponym for the group of 15 related elements in the periodic table between lanthanum and lutetium, of which lanthanum is the first and prototype. The rare earth elements traditionally include lanthanum.

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Answer: I, II, V

Explanation: