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3 years ago

7

9. i like really really really need help plz don't waste my time , thx

2 answers:

erastova [34]3 years ago

8 0

us very simple

Explanation:

2Mg+2O→4MgO

grigory [225]3 years ago

4 0

2Mg+2O ➡️4MgO.........

You might be interested in

Explain the solute and the solvent in a solution

romanna [79]

Answer:

a solute is a substance that is dissolved in the solvent (liquid)

a solvent is a substance that dissolves a solute (solid)

a solution is the mixture of both the solute and solvent forming uniform mixture

5 0

3 years ago

You wish to generate 1.00 L of a 0.0750 M NaCl solution by diluting a more concentrated solution. What volume (in mL) of a 0.275

miss Akunina [59]

Taking into account the definition of dilution, you need to use a volume of 272.72 mL of a 0.275 M NaCl solution.

<h3>Dilution</h3>

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

Ci: initial concentration
Vi: initial volume
Cf: final concentration
Vf: final volume

<h3>Initial volume</h3>

In this case, you know:

Ci= 0.275 M
Vi= ?
Cf= 0.0750 M
Vf= 1 L

Replacing in the definition of dilution:

0.275 M× Vi= 0.0750 M× 1 L

Solving:

Vi=(0.0750 M× 1 L)÷ 0.275 M

<u><em>Vi= 0.27272 L= 272.72 mL</em></u>

In summary, you need to use a volume of 272.72 mL of a 0.275 M NaCl solution.

Learn more about dilution:

brainly.com/question/6692004

brainly.com/question/16343005

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#SPJ1

8 0

2 years ago

What is the final pressure, in mmHg, for a gas in an aerosol can at an initial pressure of 1.40 atm at 12°C which is heated to 3

liubo4ka [24]

Answer:

b. 1150 mmHg

General Formulas and Concepts:

<u>Chemistry - Gas Laws</u>

Gay Lussac Law - $\frac{P_1}{T_1} =\frac{P_2}{T_2}$

P₁ is Pressure 1
T₁ is Temperature 1 in Kelvin
P₂ is Pressure 2
T₂ is Temperature 2 in Kelvin

Explanation:

<u>Step 1: Define</u>

P₁ = 1.40 atm

T₁ = 12°C

P₂ = unknown

T₂ = 35°C

<u>Step 2: Identify Conversions</u>

1 atm = 760 mmHg

K = °C + 273.15

<u>Step 3: Convert</u>

P₁ = 1.40 atm = 1064 mmHg

T₁ = 12°C = 285.15 K

T₂ = 35°C = 308.15 K

<u>Step 4: Find P₂</u>

Substitute: $\frac{1064 \ mmHg}{285.15 \ K} =\frac{P_2}{308.15 \ K}$
Cross-multiply: $(1064 \ mmHg)(308.15 \ K)=P_2(285.15 \ K)$
Multiply: $327872 \ mmHg \cdot K=P_2(285.15 \ K)$
Isolate P₂: $\frac{327872 \ mmHg \cdot K}{285.15 \ K}=P_2$
Divide: $1149.82 \ mmHg=P_2$
Rewrite: $P_2=1149.82 \ mmHg$

<u>Step 5: Check</u>

<em>We are given 3 sig figs. Follow sig fig rules and round.</em>

1149.82 mmHg ≈ 1150 mmHg

4 0

3 years ago

Help please please thanks

9966 [12]

Answer:

the agricultural revolution is the time where people went from mostly being Hunters and Gatherers to mostly farmers, a very long time ago

4 0

3 years ago

Identify the products in the reaction HCI + NaOH → NaCl + H20.

Setler [38]

C the products are on the right side of the arrow

7 0

3 years ago