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dem82 [27]
2 years ago
12

Find the molarity of 750 ml solution containing 346 g of potassium nitrate

Chemistry
1 answer:
Zinaida [17]2 years ago
5 0
Given mass of KNO₃=346g
Molar mass of KNO₃=(39.098)+(14)+(15.99*3)=101.068gmol⁻¹
Volume of Solution=750ml=0.75dm³

Molarity=(mass of solute/molar mass of solute)*(1/volume of sol. in dm³)
            =(346/101.068)*(1/0.75)
            =4.56 mol dm⁻³
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Obtain a box of breakfast cereal and read the list of ingredients. What are four chemicals from the list
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Options:

monoglycerides

cocamide DEA

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Answer and Explanation:

The added chemicals are:

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Monoglycerides are fats added for flavour. Folic cid and iron are vitamins added for nutritional value. disodium phosphate is a food additive for enhancing flavour.

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2 years ago
A voltaic cell is constructed with two silver-silver chloride electrodes, where the half-reaction is AgCl (s) + e− → Ag (s) + Cl
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Answer : The cell emf for this cell is 0.118 V

Solution :

The half-cell reaction is:

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In this case, the cathode and anode both are same. So, E^o_{cell} is equal to zero.

Now we have to calculate the cell emf.

Using Nernest equation :

E_{cell}=E^o_{cell}-\frac{0.0592}{n}\log \frac{[Cl^{-}{diluted}]}{[Cl^{-}{concentrated}]}

where,

n = number of electrons in oxidation-reduction reaction = 1

E_{cell} = ?

[Cl^{-}{diluted}] = 0.0222 M

[Cl^{-}{concentrated}] = 2.22 M

Now put all the given values in the above equation, we get:

E_{cell}=0-\frac{0.0592}{1}\log \frac{0.0222M}{2.22M}

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4 0
2 years ago
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nlexa [21]

Answer:

B.

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Explanation:

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shepuryov [24]

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2 years ago
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Explanation:

The scale is pushing back up against her feet with the same amount of force but in negative direction.

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Force brainly.com/question/12978926

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