0.65 moles of O2 originally at 85°C is cooled
such that it now occupies 8.0 L at 40.°C.
What is the final pressure exerted by the gas?

Answer:

Eggshell is made almost entirely of calcium carbonate

Explanation:

Answer: Option B) 127 °C

Explanation:

Initial volume of gas V1 = 5.00 L

Initial temperature of gas T1 = 100K

New volume of gas V2 = 20.0 L

new temperature of gas T2 = ?

Since volume and temperature are involved while pressure is constant, apply the formula for Charles law

V1/T1 = V2/T2

5.00 L/100K = 20.0 L/T2

cross multiply

5.00 x T2 = 100 x 20.0

5.00T2= 2000

T2 = 2000/5.00

T2 = 400K

Convert temperature in Kelvin to Celsius

(400K - 273) = 127°C

Thus, the new temperature of the gas is 127°C

The unit of measurement for energy is Joule (J) (3rd Option)

Energy is simply defined as the ability to work.

The system of international (SI) unit for the measurement of energy is Joule (J). Other unit of measurement is kilojoule (KJ), megajoule (MJ) etc

There are various forms of energy. This includes:

All forms of energy are measured in Joule (J)

Learn more about energy:

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Answer:

joules

Explanation:

quiz on edg. 2022

Answer:3

Explanation:

The three moles of S are divided by the moles in your product in this case 1 (AlS)

3/1=3

Answer: The answer is a B) Compound

Explanation:A compound is when two things are mixed together and steel is made of iron and carbon mixed together.

Answer:

D. 20.6g

Explanation:

Molarity is defined as ratio between moles of solute (sodium bromide, NaBr) per liter of water.

As density of water is 1g/mL; volume of 400.0g of water is 400.0mL = 0.4000L.

That means 0.400L of 0.500M solution contains:

0.400L × (0.500mol / 1L) = 0.200moles of sodium bromide.

In mass (NaBr = 102.9g/mol):

0.200mol NaBr × (102.9g/mol) = 20.6g of NaBr

Right answer is:

D. 20.6g

Answer:

Yes indeed BRUVA!!!! Electrostatic is a term used to describe the charges of the ionic compound

The mass of the platinum bar is approximately 699.9 grams.

To calculate the mass of the platinum bar, we can use its volume and density.

Given:

- Length (l) = 5.0 cm

- Width (w) = 4.0 cm

- Thickness (h) = 1.5 cm

- Mass (m) = 700.0 g

First, let's calculate the volume of the platinum bar using the formula for the volume of a rectangular prism:

[tex]\[ \text{Volume} = l \times w \times h \\\[ \text{Volume} = 5.0 \, \text{cm} \times 4.0 \, \text{cm} \times 1.5 \, \text{cm} \\\[ \text{Volume} = 30.0 \, \text{cm}^3 \][/tex]

Now, we can use the density formula to find the mass:

[tex]\[ \text{Density} = \frac{\text{Mass}}{\text{Volume}} \\\[ \text{Density} = \frac{700.0 \, \text{g}}{30.0 \, \text{cm}^3} \\\[ \text{Density} \approx 23.33 \, \text{g/cm}^3 \][/tex]

Now that we have the density of platinum, we can calculate the mass of the bar:

[tex]\[ \text{Mass} = \text{Density} \times \text{Volume} \\\[ \text{Mass} = 23.33 \, \text{g/cm}^3 \times 30.0 \, \text{cm}^3 \\\[ \text{Mass} \approx 699.9 \, \text{g} \][/tex]

So, the mass of the platinum bar is approximately 699.9 grams.

Answer:

Calibrating the cabbage pH indicator means creating a color key based on solutions that have known pH values.

Explanation:

Answer: 1st a

2nd b, d

3rd a

Explanation:

Answer:

a metal

Explanation:

metals are good conductors of electricity.

Answer:

Disagree

Explanation:

Biodiversity is having a variety, or a diversity of life. Having one crop is not a variety, therefore this field does not have high biodiversity.

In the terms of biodiversity, a large field planted with only one type of crop does not display high biodiversity. This creates a monoculture, not diverse, and more prone to disease and pests due to lack of genetic diversity.

In the context of biodiversity, a large field with only one type of crop is not considered highly diverse. Biodiversity refers to the variety of life within an ecosystem, habitat, or a specific geographic area. It includes all the different types of genes, species, and ecosystems. A field with just one type of crop results in a monoculture, which is the opposite of biodiversity.

Monocultures are more susceptible to pests and diseases because there is a lack of genetic diversity. On the other hand, high biodiversity usually means more stability in an ecosystem, with increased resilience against environmental changes and disturbances.

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To dilute the calcium sulfate solution, use the dilution formula to calculate the final volume, which is approximately 58.7mL.

To dilute the 1.72mM aqueous calcium sulfate solution to 1.00mM, we can use the dilution formula:

C1V1 = C2V2

Where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume. Rearranging the formula, we have:

V2 = (C1V1) / C2

Plugging in the values: C1 = 1.72mM, V1 = 34.3mL, C2 = 1.00mM, we can calculate the final volume:

V2 = (1.72mM * 34.3mL) / 1.00mM = 58.732mL

Rounding to 3 significant digits, the final volume is approximately 58.7mL.

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Answer:

False.

Explanation:

Scientific theories and hypothesis are all tentative. Science tries to prove something is either true of false and come up with answers (as much as we can) for many problems. Sometimes they are made based on limited data or information. Over the years, we come up with need findings discoveries which are able to give us more information and give us better answers. There have been a couple of scientific laws which had to be completely revised or discarded after new observations. An example of this would be the Laws of Thermodynamics. A couple of the laws have been changed over the decades after scientists made new disoveries and observations.

During the June solstice, the Northern Hemisphere is tilted towards the Sun resulting in longer days; vice versa for the December solstice when the Southern Hemisphere experiences summer.

During the June solstice, which occurs around June 21, the Earth's Northern Hemisphere is tilted toward the Sun.

Conversely, during the December solstice, around December 21, the Northern Hemisphere tilts away from the Sun, causing shorter days and longer nights.

June Solstice: Northern Hemisphere tilted towards the Sun, maximum sunlight at the Tropic of Cancer.

December Solstice: Northern Hemisphere tilted away from the Sun, maximum sunlight at the Tropic of Capricorn.

Final answer:

Continental plates colliding under intense pressure and heat cause existing rocks to recrystallize into metamorphic rocks, contributing to the formation of mountain ranges such as the Himalayas.

Explanation:

When two continental plates converge, the intense pressure and heat they generate cause the existing rocks at the plate boundary to recrystallize, forming metamorphic rocks. This process, often associated with mountain building, is evident in the formation of the Himalayan Mountains at such a convergent plate boundary. Between colliding continental masses, like the African plate and the Eurasian plate forming the Alps, or the Asian and Arabian plates creating the Zagros Mountains, the pressure and heat metamorphose the rocks in the mountain chains. The creation and the shaping of these mountains are not solely due to tectonic forces but are also significantly affected by volcanic activity and erosion by elements like water and ice over time.

Answer:

1)1.61molKg-1

Explanation:

we find the molality using the formula mole of solute/Kg of solvent..

Answer:

B

Explanation:

technically an electron has a very negligible mass

please like and Mark as brainliest

Answer:

[tex]SiS_2[/tex]: Silicon disulfide

[tex]NBr_3[/tex]: Nitrogen tribromide

[tex]N_2Cl_4[/tex]: Dinitrogen tetrachloride

Explanation:

Whenever you have an binary compound such as this, you can look at the individual elements for the name. The first word will simply be the prefix + the name of the element.

*** Notice you don't need to put a prefix if theres only 1. This is understood as mono. Only on the first word.

For the second word, its simply the root + ide.

Answer: Ramsar, Iran (happy to help)

Explanation:

Answer:

The answer is C16H32O2 + 23 O2 --->  16CO2 + 16H2O

Explanation:

Answer:

blank, 23, 16 , 16

Explanation:

look at my ss

Answer:

[tex]0.082 atm L mol^{-1} K^{-1}[/tex]

Explanation:

The pressure, the volume and the temperature of an ideal gas are related to each other by the equation of state:

[tex]pV=nRT[/tex]

where

p is the pressure of the gas

V is the volume of the gas

n is the number of moles

R is the gas constant

T is the absolute temperature

For the gas in this problem:

n = 2.00 mol is the number of moles

V = 17.4 L is the gas volume

p = 3.00 atm is the gas pressure

[tex]T=45C+273=318 K[/tex] is the absolute temperature

Solving for R, we find the gas constant:

[tex]R=\frac{pV}{nT}=\frac{(3.00)(17.4)}{(2.00)(318)}=0.082 atm L mol^{-1} K^{-1}[/tex]

Answer: Open System

Explanation: It's an open system because the "Cup" is literally exposed to the surroundings. It will lose heat or gain heat or any other type of energy in its surroundings.

Final answer:

To find the ΔH for the combustion of propanol, the heat released is calculated with the calorimeter's heat capacity and temperature change, and then scaled to a per-mole basis.So,combustion of propanol to carbon dioxide gas and liquid water in kJ/mol was -2012.45 kJ/mol.

Explanation:

The question involves finding the ΔH (enthalpy change) for the combustion of propanol (C3H7OH). To calculate the enthalpy change of the reaction, we first need to calculate the heat released (q) during the combustion using the formula: q = C × ΔT, where C is the heat capacity of the calorimeter and ΔT is the change in temperature.

Using the provided data, the heat released by the combustion is:
q = 14.24 kJ/K × (302.15K - 298.00K)

This results in q = 59.288 kJ (rounded to three decimal places), which is the heat released when 1.760 grams of propanol are burned. To find ΔH per mole of propanol, we need the molar mass of propanol (C3H7OH), which is approximately 60.10 g/mol. Thus, we can calculate ΔH using the proportion:

ΔH (per mole) = q (per 1.760 g) × (60.10 g/mol / 1.760 g).

The final calculation yields ΔH as -2012.45 kJ/mol (rounded to two decimal places).

Answer:

0.1M

Explanation:

We'll begin by writing a balanced equation for the reaction between HCl and NaOH. This is illustrated below:

HCl + NaOH —> NaCl + H2O

From the above equation, we obtained:

nA (mole of the acid) = 1

nB (mole of the base) = 1

Data obtained from the question include:

Ma (Molarity of the acid ) = 0.12M

Va (volume of the acid) = 21.35cm3

Mb (Molarity of the base) =?

Vb (volume of the base) = 25.55cm3

Using the equation MaVa/MbVb = nA/nB, the molarity of the base can be obtained as follow:

MaVa/MbVb = nA/nB

0.12 x 21.35 / Mb x 25.55 = 1

Cross multiply to express in linear form.

Mb x 25.55 = 0.12 x 21.35

Divide both side by 25.55

Mb = (0.12 x 21.35)/25.55

Mb = 0.1M

Therefore, the molarity of the base (NaOH) is 0.1M

The molarity of the NaOH solution is calculated using the titration method. Given that 25.55 cm3 of base neutralized 21.35 cm3 of 0.12M HCl, the molarity of NaOH was calculated to be 0.1 M.

In the standardization of NaOH solution, we use the concept of titration where a known concentration of an acid, in this case HCl, is used to find out the concentration of a base, which is NaOH here. During this process, the volume of the base that neutralizes a given amount of acid is measured. From the given data, we know that 25.55 cm3 of base neutralized 21.35 cm3 of 0.12M HCl.

Given that, the stoichiometry of the reaction between HCl and NaOH is 1:1, the moles of HCl used can be calculated using the formula:

moles = Molarity * Volume (in litres)

Therefore, moles of HCl = 0.12 M * 21.35 cm3 / 1000 = 0.002562 mol

Since the reaction is 1:1, the moles of NaOH would be the same, i.e., 0.002562 mol.

The molarity of NaOH can then be calculated using the formula:

Molarity = Moles / Volume (in litres)

So, Molarity of NaOH = 0.002562 mol / 25.55 cm3 x 1000 = 0.1 M

Therefore, the molarity of the NaOH solution is 0.1 M.

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Answer: The amount of energy required to convert ammonia back to hydrogen and nitrogen is 45.9 kJ

Explanation:

Endothermic reactions are defined as the reactions in which energy is absorbed in the reaction. The enthalpy change of the reaction is positive.

Exothermic reactions are defined as the reactions in which energy is released in the reaction. The enthalpy change of the reaction is negative.

For the given chemical equation:

[tex]3H_2(g)+N_2(g)\rightarrow 2NH_3(g);\Delta H=-45.9kJ[/tex]

In the above reaction, the enthalpy change is negative. So, the reaction is exothermic in nature.

For the reverse reaction, the magnitude of the enthalpy change remains the same but sign for it changes.

Hence, the amount of energy required to convert ammonia back to hydrogen and nitrogen is 45.9 kJ

Answer: To determine the mole ratio

Explanation:

A balanced chemical equation is needed ,because it helps to determine the mole ratio of acid and base.

The mole ratio ensures that the number of moles of H+ provided by the acid is equal to number of moles of OH- ion provided by the base, For neutralization to occur, this must be the case.