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butalik [34]
3 years ago
7

How many moles of Cl- ions are needed to completely combine with 0.25 moles of Mg+2 ions?

Chemistry
1 answer:
liberstina [14]3 years ago
5 0
Mg⁺² + 2Cl⁻ = MgCl₂

n(Mg⁺²)=0.25 mol

n(Cl⁻)=2n(Mg⁺²)

n(Cl⁻)=2*0.25=0.5 mol
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Plasma is often in stars, which are likely to contain?
elena-s [515]
Below are the choices that can be found from other sources:

<span>A) elements 
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the answer is ions. 

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6 0
3 years ago
Gases are measured in different units. Which of the following measurements of pressure are equal? Select all that apply.
viva [34]

Explanation:

Pressure of a gas is the combined force with which the molecules bombard a unit area of the wall of the container.

    1 atm  = 760mmHg

               = 760torr

               = 101325Pa

               = 101325Nm⁻²

 1mmHg  = 1torr

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101.325 kPa  and 101,325 Pa are the same

           1000Pa = 1kPa

101,325 Pa  and 1 atm

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6 0
2 years ago
A 100.0 g sample of aluminum released 1680 calories when cooled from 100.0c to 20.0 c what is the specific heat of the metal
vovangra [49]

Answer:

The specific heat of aluminium is 0.8792 J/g °C  or 0.21 Cal/g °C

Explanation:

Step 1 : Write formule of specific heat

Q=mcΔT

with Q = heat transfer (J)

with m = mass of the substance

with c = specific heat ⇒ depends on material and phase ( J/g °C)

with ΔT = Change in temperature

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Q = 1680 Calories = 7033.824 J ( 1 calorie = 4.1868 J)

m = 100.0g

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<u>Step 2:  Calculating specific heat</u>

⇒ via the formule Q=mcΔT

7033.824 J = 100g * c * 80

7033.824 = 8000 *c

c = 7033.824 /8000

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or 0.21 Cal / g°C

The specific heat of aluminium is 0.8792 J/g °C  or 0.21 Cal/g °C

6 0
3 years ago
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3 0
3 years ago
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