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3 years ago

How can ionic compounds break into pieces?

1 answer:

7 0

You could simply add water. For example, NaCl is table salt. If you add water, the sodium and chlorine ions will separate thereby breaking the ionic compound intotwo pieces.Apr 3, 2014

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(Atomic masses used are C = 12.0 g mol–1, O = 16.0 g mol–1, H = 1.01 g mol–1, Cu = 63.5 g mol–1,)

alex41 [277]

Question 1

The formula mass of methanol is $12.0+3(1.01)+16.0+1.01=32.04$ g/mol.

Therefore, in 5.0 grams of methanol, there are $5.0/32.04=\boxed{0.16}$ moles.

Question 2

The formula mass of copper(II) carbonate is $63.5+12.0+3(16.0)=123.5$ g/mol.

This means that in 9.0 grams of copper(II) carbonate, there are $9.0/123.5=0.072874493927126$ moles.

Using Avogradro's number, there are $(0.072874493927126)(6.022 \times 10^{23})=\boxed{4.4 \times 10^{22}}$ molecules.

Question 3

The formula mass of cyclohexane is $12.0(6)+1.01(12)=84.12$ g/mol.

So, 3.0 grams of cyclohexane is the same as $3.0/84.12=\boxed{0.036}$ moles.

Question 4

The formula mass of benzene is $12.0(6)+1.01(6)=78.06$ g/mol.

This means that 4.00 moles of benzene has a mass of $(78.06)(4.00)=\boxed{312}$ grams.

Question 5

1000 atoms of calcium is the same as $\frac{1.000}{6.022 \times 10^{23}}$ moles.

This is equal to $\frac{1000}{6.022 \times 10^{23}} \cdot 40.078=\boxed{6.7 \times 10^{-20}}$ grams.

6 0

1 year ago

2H2 + O2 -> 2H20 How many grams of oxygen are needed to produce 25 grams of H20

vaieri [72.5K]

Answer:

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Explanation:

7 0

3 years ago

What happens when the electron moves from the first energy level to the second energy level?

STatiana [176]

If an electron moves up from the first orbit to the higher energy levels, energy will be absorbed by the electron itself and no emission line produced.
But if it moves from the orbits 6,5,4 and 3 to orbit 2, energy will be released by the electron and different emission lines wll be produced.

5 0

3 years ago

Read 2 more answers

Help please chapter 7.1

olga2289 [7]

1. 100N to the right
2. 10N to the left
3. 0N they are balanced
4. 0N they are balanced

8 0

3 years ago

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?

dangina [55]

Answer:

Volume of the gass will decrease by three times of the original volume