can someone help me sort this :(

Reaction 1 → Al + Zn²⁺ ⟶ Al³⁺ + Zn

Reaction 2 → Al³⁺ + Li ⟶ Al + Li⁺

Reaction 1 :-

Substance Oxidised :- Al

Substance Reduced :- Zn²⁺

Oxidizing Agent :- Zn²⁺

Reducing Agent :- Al

Reaction 2 :-

Substance Oxidised :- Li

Substance Reduced :- Al³⁺

Oxidizing Agent :- Al³⁺

Reducing Agent :- Li

Reaction 1 :-

Al

Zn²⁺

Zn²⁺

Al

Reaction 2 :-

Li

Al³⁺

Al³⁺

Li

Solution,

Mass of Mg - 21gm

molar mass of Mg - 24gm

moles = Given mass/ Molar mass

moles = 21/24 = 0.875

1 mole of Mg produce 1 mole of H2 gas

so 0.875 mole of Mg will produce 0.875 moles of H2 gas

One mole of H2 gas = 22.4 litre

0.875 mole of H2 gas = 0.875×22.4

0.875 mole of H2 gas = 19.60 litre

So the nearest ANSWER is Option four 19.37 litre.

STP is the standard temperature and the pressure of the gases of the system. The volume of the hydrogen that will be produced as STP is 19.37 litres.

Volume is the amount of the substance or the solution occupied in an area or object and is estimated in L or mL. It is a scalar quantity.

Given,

Mass of magnesium = 21 gm

Molar mass of magnesium = 24 gm/mol

Moles of magnesium can be calculated as,

[tex]\begin{aligned}\rm moles &= \rm \dfrac{mass}{molar\;mass}\\\\&= \dfrac{21}{24}\\\\&= 0.875 \;\rm mol\end{aligned}[/tex]

If 1-mole magnesium = 1-mole hydrogen gas

Then 0.875-mole magnesium = 0.875 moles of hydrogen gas

If 1 mole of hydrogen gas = 22.4 L

Then, 0.875 moles of hydrogen gas = x L

Solving for x:

[tex]\begin{aligned}\rm x &= 0.875 \times 22.4\\\\&= 19.60 \;\rm litre\end {aligned}[/tex]

Therefore, the volume of hydrogen at STP would be option 4. 19.37 litres.

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Answer:

0.89 L

Explanation:

Applying,

Boyle's Law,

PV = P'V'..................... Equation 1

P represent initial pressure, V represent initial volume, P' represent final pressure, V' represent final volume

Make V' the subject of the equation

V' = PV/P'.............. Equation 2

From the question,

Given: P = 150 mm Hg, V = 4.31 liters, P' = 725 mm Hg

Substitute these values into equation 2

V' = (150×4.31)/725

V' = 0.89 L

Answer:

CATION

Explanation:

If an atom has an equal number of protons and electrons, its net charge is 0. If it gains an extra electron, it becomes negatively charged and is known as an anion. If it loses an electron, it becomes positively charged and is known as a cation.

Answer:

D. ) 2H2O - 2H2 + O2

Answer: 1.535e42 (or 1.535x10^42) moles of CO2

Explanation: i know this is six days late, but all you have to do for this one is multiply 2.55e18 by the standard mole value, 6.02e23 and your calculator will give you 1.535e42 moles!

Answer:

Controls the movement of substances into and out of the cell.

P2 = 54.6 kPa

Explanation:

Given:

V1 = 10.0 L. V2 = 50.0 L

P1 = 273 kPa. P2 = ?

We can use Boyle's law to solve this problem.

P1V1 = P2V2

Solving for P2,

P2 = (V1/V2)P1

= (10.0 L/50.0 L)(273 kPa)

= 54.6 kPa

Answer:

2.04 moles

Explanation:

Since the ratio of Na2O to NaOH is 1:2, you multiply the number of moles by 2, equaling 2.04 moles.

Answer:

[tex]\huge \fbox \pink {A}\huge \fbox \green {n}\huge \fbox \blue {s}\huge \fbox \red {w}\huge \fbox \purple {e}\huge \fbox \orange {r}[/tex]

Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. This is important to every living thing on earth. It means that wherever water goes, either through the ground or through our bodies, it takes along valuable chemicals, minerals, and nutrients.

It is water's chemical composition and physical attributes that make it such an excellent solvent. Water molecules have a polar arrangement of the oxygen and hydrogen atoms—one side (hydrogen) has a positive electrical charge and the other side (oxygen) had a negative charge. This allows the water molecule to become attracted to many other different types of molecules. Water can become so heavily attracted to a different molecule, like salt (NaCl), that it can disrupt the attractive forces that hold the sodium and chloride in the salt molecule together and, thus, dissolve it.

Answer:

Explanation:

The new volume can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we're finding the new volume we have

[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]

First convert 745 mmHg to atm

760 mmHg = 1 atm

745 mmHg = 745/760 = 0.98 atm

We have

[tex]V_2 = \frac{500 \times 0.98}{1.8} \\ = 272.222...[/tex]

We have the final answer as

Hope this helps you

The Answer is compensation

Answer:

1.38 atm

Explanation:

Partial pressure of a gas = total pressure × mole fraction of that gas.

Mole fraction of a gas is moles of a gas ÷ total moles of all gases.

The partial pressure of Helium gas is 2.756 atm. This can be calculated by using mol fraction first.

Calculation of mol fraction:

It is the ratio of one mole of gas to the total moles of all the gases.

Total moles of all gases = 0.380+0.250+0.500 =1.13

Mol fraction of Helium gas = 0.500/1.13

Mol fraction of Helium gas = 0.442

It is the product of mol fraction of the gas to the total pressure given.

Partial pressure= 0.442 * 6.52 atm

Partial pressure=2.765 atm

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Answer:

Carbon in the biosphere

Explanation:

Carbon is found in the biosphere stored in plants and trees. Plants use carbon dioxide from the atmosphere to make the building blocks of food during photosynthesis. Carbon is found in the hydrosphere dissolved in ocean water and lakes. Carbon is used by many organisms to produce shells.

Answer:

butyne

Explanation:

Suffix -yne indicates presence of triple bond and prefix but- means 4 carbons atoms.

Answer:

the answer is A

Explanation:

hope it hlp

Answer: 6.45 Joules

Explanation: I just did it

Answer:

weight of H₂O formed = 2.3 grams H₂O (2 sig. figs.)

Explanation:

Rxn:                  CH₄(g)         +      2O₂(g)          =>     CO₂(g)           +  2H₂O(g)

Given:                 1.16g                   4.16g                     3.52g                  ? (g)

Moles:         1.16g/16g·mol⁻¹    4.16g/32g·mol⁻¹    3.52g/44g·mol⁻¹

                     = 0.0725mol.        = 0.13mol.             = 0.08mol.    => ? (moles)

Limiting Reactant: Divide each mole value by related coefficient of balanced standard equation (that is, balanced with coefficients in lowest whole number ratios). The smaller value is the limiting reactant.

                    0.0725/1                   0.13/2                0.080/1

                    = 0.0725                 = 0.065              = 0.080

Limiting Reactant is O₂(g) => 0.065 is smaller value after dividing each mole value by related coefficient of balanced equation.

NOTE: When working problem, however, one must use the mole value calculated from given amount in grams. That is, in this case 0.13 mole O₂. The 'divide by related coefficient and check smaller value' is ONLY for identifying the limiting reactant. This trick works for ALL general chemistry problems.

Moles H₂O formed: Since the coefficient of the limiting reactant (O₂) equals the coefficient of water (H₂O), then the moles of water formed is 0.065 mole H₂O.

Weight (in grams) of H₂O formed:

Grams H₂O = moles H₂O  x  formula weight H₂O

                   = 0.13 mole H₂O  x  18 g H₂O/mole H₂O

                   = 2.34 g H₂O  (calculator answer)

                   = 2.3 g H₂O  (final answer should be rounded to  2 sig. figs.)                                                                                                                                        => form of final answer should be based on data in final computation having the least number of sig. figs.                                      

Review: Sequence of calculations

       =>  moles of limiting reactant / coefficient of same cpd. in std. equation               = unknown (X) / coefficient of same (unknown) cpd. in std. equation

       => cross multiply and solve for unknown (X)

       => L.R.(moles) / eqn. coef. of L.R. = X / eqn. coef. of X  

       => (L.R.(calc'd moles)(eqn. coef. of X) = (X)(eqn. coef. of L.R.)

       => X (in moles) = (L.R.(calc'd. moles)(eqn. coef. of X) / (eqn. coef. of L.R.)

        => grams = moles x formula wt.                                                                

        => volume (L) = moles x std. volume (= 22.4L/mole)                                  

        => #particles = moles x Avogadro's Number (= 6.02 x 10²³ parts/mole)

Answer:

The pOH is 2.603

Explanation:The formula for finding pOH by pH is simply subtracting the pH from 14 pOH=14-11.397pOH=2.603.

Answer:

joules

Heat is the transfer of thermal energy from a system to its surroundings or from one object to another as a result of a difference in temperature. Heat is measured in joules (J).

Explanation: Mrk me brainliest please

Answer: Joules or calories

Answer:

well im sorry to say this but good luck >:}

Explanation:

Explanation:

When the electron changes levels, it decreases energy and the atom emits photons. The photon is emitted with the electron moving from a higher energy level to a lower energy level. The energy of the photon is the exact energy that is lost by the electron moving to its lower energy level.

Answer:

divide the mass of element in 1 mole of the compound by the compound's molar mass and multiply the answer by 100.

Explanation:

take the molar mass of hydrogen in the water molecule, divide by the total molar mass of water, and multiply by 100.

does it help?

drag

effect

friction

parachutes

surface area

streamlined

air

water

Explanation:

It's (D), nuclear fission................

The name of the alkyne which is given in the question with structure is propyne as in that 3 carbon atoms are present.

Alkynes are those hydrocarbons in which triple bond is present between two adjacent carbon atoms.

In the given structure one triple bond is present between first two carbon atoms and then with this a single bonded carbon atom is also attached. As in the structure total three carbon atoms are present so prefix shoul be 'prop' and as this is an alkyne then name should be propyne.

Hence name of compound is propyne.

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Propyne is the chemical name for the given alkyne. Therefore, the correct option is option C.

A triple bond exists between the carbon atoms in alkynes, a group of hydrocarbon molecules. They are given names based on the IUPAC (International Union of Pure and Applied Chemistry) guidelines for systematic nomenclature. Alkyne nomenclature's primary objective is to provide each compound a precise and distinctive name that accurately captures its structure.  Based on the quantity of carbon atoms, the placement of triple bonds, and the presence of functional groups, alkyne compounds are named systematically.

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#SPJ6

Answer:

WATER

Explanation:

Water melting  point 0 c boiling 100c