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Andrews [41]
3 years ago
14

Please help!!! Need answer fast.

Chemistry
1 answer:
bogdanovich [222]3 years ago
5 0

^ tap to see the full pic

Explanation:

you make use of the formulas

amount(mol) = number of particles ÷ 6.02 × 10^23

and

mass(g) = amount(mol) × molar mass

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Which energy changes in the enthalpy of solution are endothermic, and which are exothermic?
snow_tiger [21]
When energy is needed in order for the reaction to happen, then that reaction is known as endotermic. When the reaction has as a result energy then it is exotermic. An example of an endotermic reaction would be photosynthesis, for an exotermic: combustion.
8 0
4 years ago
A gas at constant volume has a pressure of 4. 50 atm at 200. K. What will be the pressure of the gas at 250. K? 3. 60 atm 4. 60
Trava [24]

5.625 atm will be the pressure of the gas at 250 K temperature of the gas at constant volume.

<h3>How we calculate the pressure of the gas?</h3>

Pressure of the gas will be calculated by using the ideal gas equation as:

PV = nRT,

From the question, it is clear that:

Moles of the gas and volume is constant here, so we calculate the pressure by rearranging the above equation as:

P/T = nR/V

And required equation will be:

P₁/T₁ = P₂/T₂, where

P₁ = pressure of gas = 4.50 atm

T₁ = temperature of gas = 200 K

P₂ = pressure of gas = to find?

T₂ = temperature of gas = 250 K

On putting all these values in the above equation, we get

P₂ = 4.50 × 250 / 200 = 5.625 atm

Hence, 5.625 atm is the pressure of the gas.

To know more about ideal gas equation, visit the below link:

brainly.com/question/1056445

5 0
3 years ago
Make a list of 5 metals and 5 non metals and their real life application and any additional information about
svetoff [14.1K]

Answer:

Metals:

Copper: to make cooking utensils such as pots because it has a high heat conductivity.

Aluminium: to make aluminium foil / soda cans because it is malleable

Mercury: fills up thermometers because it can indicate the temperature when it expands. But it is toxic so fewer people are using mercury thermometers now.

Titanium: to make the body of supersonic aircrafts because it is strong and corrosion resistant

Gold: to make jewelry because it is shiny and also corrosion resistant

Non-metals:

Nitrogen: to fill up chip packages because its molecules are unreactive

Helium: to fill up balloons because it is lightweight

Hydrogen: for generating electricity in hydrogen fuel cells. It is environmentally-friendly because it does not produce any greenhouse gas or toxic pollutants.

Fluorine: added in toothpaste for strengthening the teeth. It can also prevent cavities.

Carbon: the graphite in pencils. this is one form of carbon. Other common forms (allotropes) of carbon include diamond and Buckminsterfullerene (buckyball).

6 0
4 years ago
The volume of a gas filled balloon is 22L at 313K and 1.5 atm. What would the volume be at 273K and 1 atm?
avanturin [10]
<h3></h3>

From the calculations and the statement of the general gas equation, the volume of the gas becomes 28.8 L

<h3>What are gas laws?</h3>

The gas laws are used to show the relationship between the variables in problems that has to do with gases.

In this case, we have to apply the general gas law as follows;

P1V1/T1 = P2V2/T2

P1V1T2 = P2V2T1

V2 =   * 22L *  1.5 atm * 273K/313K * 1 atm

V2 = 28.8 L

Learn more about gas laws:brainly.com/question/12667831

#SPJ2

7 0
3 years ago
Read 2 more answers
5.68 x 10^4 mL to L Express your answer to three sianificant fiqures and includ
olasank [31]

Answer:

5.68 × 10⁴ mL = 56.8 L

Explanation:

Volume is defined as the amount of three-dimensional closed space. The SI unit of volume is cubic metre which is denoted by the symbol m³.

According to the metric system, other units of volume include: litre (L), millilitre (mL) and cubic centimetre (cm³).

Since, 1 mL = 0.001 L = 10⁻³ L

Therefore, 5.68 × 10⁴ mL = 5.68 × 10⁴ × 10⁻³ L = 5.68 × 10 L = 56.8 L

5.68 × 10⁴ mL = 56.8 L, has three non-zero significant figures.

3 0
4 years ago
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