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ioda
3 years ago
14

How many moles are in 15 grams of lithium?

Chemistry
1 answer:
stira [4]3 years ago
8 0
Moles of substance = mass of that substance/molar mass of that substance = 15/6.9 = 2.17 moles.
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A stock bottle of an acid reads: 56% by mass and 1.25 specific gravity. If the molar mass of the acid is 70g, find the mole per
TiliK225 [7]

Answer:

  • <u>10 mol / dm³</u>

Explanation:

Cubic decimeter is the same unit as liter; so, mole per cubic decimeter is mole per liter, and that is the unit of concentration of molarity. Thus, what is asked is the molarity of the solution. This is how you find it.

1. <u>Take a basis</u>: 1 dm³ = 1 liter = 1,000 ml

2. <u>Calculate the mass of 1 lite</u>r (1,000 ml) of solution:

  • density = mass / volume ⇒ mass = density × volume

Here, the density is given through the specific gravity

Scpecific gravity = density of acid / density of water

Take density of water as 1.00 g/ml.

  • density of solution = 1.25 g/ml

  • mass solution = 1.25 g/ml × 1,000 ml = 1,250 g

3. <u>Calculate the mass of solute</u> (pure acid)

  • % m/m = (mass of solute / mass of solution) × 100

  • 56 = mass of solute / 1,250 g × 100

  • mass of solute = 56 × 1,250g / 100 = 700 g

4. <u>Calculate the number of moles of solute</u>:

  • moles = mass in grams / molar mass = 700 g / 70 g/mol = 10 mol

5. <u>Calculate molarity (mol / dm³)</u>

  • M = number of moles of solute / liter of solution = 10 mol / 1 liter = 10 mol/liter.
5 0
3 years ago
Jacob eats a snack, and then plays basketball with his friends. When he shoots the basketball at the hoop, he is changing _____.
olchik [2.2K]
A because it requires energy from food to move which is mechanical
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3 years ago
If 0.0203 g of a gas dissolves in
ololo11 [35]

Answer:

P2 = P1*n2 / n1

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Explanation:

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3 years ago
What is true about the formation of a bond?
timama [110]

Answer:

There is an overall release of energy when bonds form.

Explanation:

There is a general release of energy when bonds form. This energy is called bond energy.

Bond energy is involved in the breakdown or formation of one or more bonds between atoms of a molecule. Atoms bond with each other to achieve their electronic stability, that is, they move from a higher energy situation to a lower energy one. With this we can state that when the bond between atoms is formed, energy is released; therefore, its breakdown depends on energy absorption.

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3 years ago
Hecking skills activated
artcher [175]

Answer:

yes 34

Explanation:

4/13 =0.307

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2 years ago
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