Chemical reactions spontaneously occur when the free energy of the products is ___________ the free energy of the reactants.

Answer:

c.

Explanation:

Answer:

D

Explanation:

The temperature increases

Answer:

V2 = 2.79

Explanation:

T1 = 15C = 288.15K

P1 = 1 atm

V1 = 2.58L

T2 = 38C = 311.15K

P2 = 1 atm

V2 = ?

311.15 x 1 x 2.58 ÷ 288.15 ÷ 1 = V2

V2 = 2.79 L

So 2.79 L is the answer!!

The periodic table is the arrangement of the elements based on their atomic numbers.  The theoretical yield of lithium bromide will be 151 gm.

A theoretical yield is the estimation of the number of moles of product formed in relation to the reactants consumed in a reaction.

The balanced chemical reaction can be shown as:

[tex]\rm LiOH + HBr \rightarrow LiBr + H_{2}O[/tex]

From the reaction, it can be seen that the moles of all the compounds and molecules are 1.

The molar mass of lithium hydroxide is calculated as:

6.94 + 15.999 + 1.008 = 23.947 gram per mol

The molar mass of hydrogen bromide is calculated as:

1.008 + 79.904 = 80.912 gram per mol

The moles of lithium hydroxide is calculated as:

[tex]117\;\rm g (\dfrac{1\;\rm mol}{23.947}) = 4.89\;\rm mol[/tex]

The moles of hydrogen bromide is calculated as:

[tex]141\;\rm g (\dfrac{1\;\rm mol}{80.91}) = 1.74\;\rm mol[/tex]

From this, it can be said that hydrogen bromide is a limiting reagent as it has fewer moles than LiOH.

The molar mass of lithium bromide is given as, 6.94 + 79.904 = 86.844 grams per mol

Mass of lithium bromide formed will be:

[tex]\rm 1.74\;\rm mol (\dfrac{86.84}{1\;\rm mol}) = 151\;\rm gm[/tex]

Therefore, the theoretical yield of lithium bromide is option C. 151 gm.

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Answer:

Total number of protons and neutrons in an atom

Explanation:

Claim 2 is correct as during the chemical reaction, the rust and another substance were produced.

This is defined as two or more substances being converted to new substances known as products.

The reaction between iron pipes and the fertilizer will lead to the formation of products such as rust and another substance. The people of Westfield may likely have compounds such as Sodium nitrite in their water.

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Answer:

[tex]1.90[/tex] [tex]moles[/tex]

During a chemical reaction, the quantity of heat can only be added or removed in aim to maintain all of the components involved at almost the same temperature. It can be described by Hess's law.

The total enthalpy change for a reaction is the sum of all changes, according to Hess's Law of Constant Heat Summation. The fact that enthalpy is just a state function is demonstrated by this law.

Hess's law can be expressed as:

Δ[tex]H_{reaction}[/tex] = ∑nΔ[tex]H_{product}[/tex] - ∑nΔ[tex]H_{reactant}[/tex].

where, n indicates stoichiometric coefficients, ΔH indicates enthalpy of reaction( reactant and product)

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Answer: 176.18 kJ/mol

Explanation:

Answer:

c. 640.51

Explanation:

Given: 2.54 cm = 1 inch weighed 3.88 ounces

1 g = 0.035273 ounces

?   = 3.88 ounces

? = (3.88 x 1) / 0.035273

? = 109.999 = 110 g

110 g = 3.88 ounces

2.54 cm = 110 g

14.79 cm = ?

? = (14.79 x 110) / 2.54

? = 640.51 g

According to unit conversion, there are 640.51 g would a 14.79 cm length of same iron rod weigh.

Unit conversion is defined as a multi-step process which involves multiplication or a division operation by a numerical factor.The process of unit conversion requires selection of appropriate number of significant figures and the rounding off procedure.

It involves a conversion factor which is an expression for expressing the relationship between the two units.A conversion ratio always has value which equals to one which indicates that numerator and denominator have values which are expressed in different units.

Given: 2.54 cm = 1 inch weighed 3.88 ounces,1 g = 0.035273 ounces

x  = 3.88 ounces

x= (3.88 x 1) / 0.035273

x = 109.999 = 110 g

110 g = 3.88 ounces

Thus,2.54 cm = 110 g

14.79 cm = x

x= (14.79 x 110) / 2.54

x = 640.51 g

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Answer:

View the attached photo, i wrote it roughly but i hope you will understand. And more common bromine is Bromine-79.

Explanation:

Remember Atomic number is number of protons OR of electrons.

atomic mass is the number of protons and neutrons.

i got neutrons by subtracting mass number and atomic number.

Bromine-79 is more common because all bromine atoms have 35 protons, this isotope would have 44 neutrons.

Answer:

The key to chemistry is to change everything to moles. Then when you have the answer in moles change the answer back to grams, liters, or whatever you want.

change 25 grams of potassium chlorate to moles.

calculate the gram molecular mass of potassium chlorate.

Chlorate is Cl with 3 oxygens. ate = saturated. Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron.

1 K x 39 grams/mole

+1 Cl x 35.4 grams/ mole

+3 O x 16 grams/ mole

= 122.4 grams / mole Potassium Chlorate

25

122.4

= moles.

2.05 moles of Potassium Chlorate.

There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride.

2.05 moles of Potassium Chlorate will produce 2.05 moles of Potassium Chloride.

Find the gram molecular mass of Potassium Chloride.

1 K x 39 = 39

+1 Cl x 35.4 = 35.4

= 74.4 grams / mole.

2.05 moles x 74.4 grams/ mole = 15.2 grams

Explanation:

big brain ;)

Answer:The amount of water wasted per month will be 946.4 liters per month.Since 1 gallon = 3.8 litersTherefore, 3000 gallons will be:= 3000 × 3.8= 11356.24 gallons12 months = 1 yearThen, you'll divide the total gallons gotten by 12. This will be:= 11355.24 / 12= 946.4 liters per month.In conclusion, 946.4 liters per month is wasted.4 Liters per monthStep-by-step explanation:First you multiply 3,000 gal by 3.8 since 1 gal = 3.8 L which comes out to 11356.24 and then you divide that by 12 since theres 12 months in a year and you're trying to get liters wasted per month :)Hope this helps!

Explanation:

The mass of propane, C₃H₈ that will vaporise as a result of absorbing 100 KJ of energy is 280.25 g

1 mole of propane C₃H₈ = (3×12) + (1×8) = 44 g

From the question given above,

15.7 KJ of heat energy vaporised 44 g of propane.

Therefore,

100 KJ of heat energy will vaporise = (100 × 44) / 15.7 = 280.25 g of propane

Thus, 280.25 g of propane were vaporised from the tank.

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The net ionic equation for potassium fluoride and ammonium chloride is

NH_4^++F^-(aq)--->NH_3(aq)+HF(aq)

Generally, The net ionic equation can simply be defined as a chemical equation that records solely those species experiencing the reaction.

Therefore,  net ionic equation for potassium fluoride and ammonium chloride

NH_4Cl(aq) and KF(aq) are both salys

Therefore, the ionic equation excludes them and is

NH_4^++F^-(aq)--->NH_3(aq)+HF(aq)

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Answer:

A

Explanation:

2 has 4, 3 and 4 both have 2.

(if 3 had a decimal point it would have 3 sig figs)

The mass measurement contains a total of three significant figures is 22.0 g. Thus option A is correct.

Mass is defined as the inertia, a fundamental feature of all stuff, is quantified.

It is also defined as a dimensionless quantity that represents the mass of a particle or object.

Mass can be expressed as

Mass = density x volume

Significant figure is defined as a number in positional notation is a set of digits that may be relied on to signify the quantity of anything.

It can also be defined as the amount of significant single digits from 0 to 9 in the coefficient of the expression that accurately conveys the meaning.

Thus, the mass measurement contains a total of three significant figures is 22.0 g. Thus option A is correct.

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Two blocks of platinum have a temperature of 200 Celsius. Both the blocks have the same amount of thermal energy because both are metals which conducts heat energy throughout their bodies.

Conduction is the process by which heat energy is transmitted between neighboring atoms or molecules. We know that metals are the good conductors of heat and electricity so if one part absorb heat, it will spread to the whole body so we can conclude that the thermal energy will remain the same amount throughout the whole body.

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The chemical reaction will be NaF

Answer:

2Na + F_2

Here Sodium is taken in solid form and Fluorine is taken as gaseus

Answer:

In displacement reactions

Explanation:

Glycerol is the three-carbon backbone of triglycerides, while fatty acids are longer chains of carbon molecules attached to the glycerol backbone.

Answer:

a and d but were in America so d

Answer:

D. a nonpolar covalent bond

Answer:

D a nonpolar covalent bond

Explanation:

edge 2020

Answer:b

Explanation:

Both devices work because of electromagnetic induction, which is when a voltage is induced by a changing magnetic field.

Answer:

A

and B

Explanation: hope this helps, pls mark brainliest.

Answer:

Explanation : Ethanoic acid has the lowest vapor pressure i.e 0.08 atm at the temperature of 50°C compared to the other given options

Explanation:

Answer:

15

Explanation:

Answer:

awnser is true took the test

Explanation:

i took the test

Answer:

B.

Explanation:

An ammonia solution contains only a few ions, and it conducts electricity only poorly.

Answer:A-density and B-mass is the answer.

Explanation:

Answer:

1.) Density

2.) Mass

Explanation:

The reactions are completed as folows;

2NaBr + Ca -----> CaBr2 + Na

2Mg + O2 ----> 2MgO

The electrochemical series has to do with the arrangement of atoms in order of reactivity. The metals that are up in the series are more reactive than the metals that are below.

In this case, the reactions are completed as folows;

2NaBr + Ca -----> CaBr2 + Na

2Mg + O2 ----> 2MgO

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Answer:

4

Explanation:

bond energy which is high means that a bond is strong and the molecule containing that bond is less reactive.