NaOH has a molarity of 2.5 M and a volume of 4 Liters, how many moles are in the solution?

What is the molarity of a solution prepared by dissolving 30.0 grams of NaOH in enough water to make a solution with a total vol

Simora [160]

Answer:

$\fbox{0.3125 M}$

Given:

Given mass of NaOH = 30 gram
Molar mass of NaOH = 40 gram
Volume = 2.40 litres

To find:

Molarity = ?

Solution:

Molarity is nothing but the number of moles of solute dissolved in per litre of solution. given by formula,

$Molarity = \frac{given \: mass}{molar \: mass \times Volume}$

$\sf Molarity \: = \frac{30}{40 \times 2.4} = 0.3125 \: M$

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7 0

2 years ago

Hydrogen gas and aqueous zinc chloride are produced by the reaction of aqueous hydrochloric acid and solid zinc . Write a balanc

Ymorist [56]

1. Write out all the ions/elements and indicate whether they are reactants or products.

Reactants:

Aqueous Hydrochloric Acid: HCl (H has a charge of +1 and Cl has a charge of 1-, so when an ionic bond forms they will form HCl).

Solid Zinc: Zn (since it is a solid zinc with no other forms of elements, the zinc is pure).

Products:

Hydrogen gas: H2 (it has to be H2 because Hydrogen is a diatomic element, and when by itself during reactions, will be H2 instead of H).

Aqueous Zinc Chloride: ZnCl2 (Zn has a charge of 2+ and Cl has a charge of 1-, so through an ionic bond, they will form ZnCl2).

2. Using this information, you can then write out the unbalanced equation.

HCl + Zn -> H2 + ZnCl2

3. Next, indicate their states of matter and any aqueous solutions.

HCl (aq) + Zn (s) -> H2 (g) + ZnCl2 (aq)

4. Try different numbers until you get the same numbers of H, Cl, and Zn on both sides.

2 HCl (aq) + Zn (s) -> H2 (g) + ZnCl2 (aq)

As you can see, the equation contains 2 Hydrogen atoms on both sides, 2 Chloride atoms on both sides, and 1 Zinc atom on both sides. The equation is chemically balanced.

5 0

4 years ago

Match the following. 1. an ancient study or art which attempted to combine science and philosophy to solve worldly problems atom

Zinaida [17]

Answer:

1. An ancient study or art which attempted to combine science and philosophy to solve worldly problems Alchemy

2. A homogeneous mixture of elements with metals to form metallic solids Alloy.

3. The simplest unit of an element that still retains the properties of that element compound Atom

4. Two or more elements joined together such that the elements have lost their individual identity Compound

5. A primary substance that cannot be divided into separate substances element Element.

6. The group of elements that are good conductors of electricity and heat Metals

7 . The group of elements that are poor conductors of electricity and heat Non metal

7 0

4 years ago

At room temperature, all samples of liquid water must have the same

laiz [17]

Density. water's density is always 1 g/ cm^3

4 0

3 years ago

Read 2 more answers

Weak acids are poor conductors of:

valentina_108 [34]

Answer: Weak acids are poor conductors of electricity.

Explanation:

Weak acids are defined as the acids which dissociate weakly or partially when dissolved in water (polar solvent).

For example, $CH_3COOH \rightleftharpoons CH_3COO^{-} + H^{+}$

Due to less dissociation there will be less number of ions present in a solution of weak acid. As a result, a weak acid will be poor conductor of electricity.

As electricity is the flow of ions.

Thus, we can conclude that weak acids are poor conductors of electricity.

3 0

3 years ago