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padilas [110]
3 years ago
11

Given the balanced ionic equation: 2Al(s) + 3Cu2+(aq) → 2Al3+(aq) + 3Cu(s) Compared to the total charge of the reactants, the to

tal charge of the products is 1. less 2. greater 3. the same
Chemistry
1 answer:
ryzh [129]3 years ago
4 0

Answer:

3.- The same

Explanation:

1.- In the reactants you need to calculate the charges that you have:

2 Al(s) = zero, because the aluminum is in it based formed (that mean without charge).

3 Cu2+ = 3 x 2+ = 6+ That is the total positive charges that copper collaborate in this reaction.

2.- Then calculate the charges on the products:

2 Al3+ = 2 x 3+ = 6+ charges from the aluminum.

3 Cu(s) = zero, because the copper in this case is in the base form

3.- In this way, the charges at the begging (6+) and at the end (6+) are the same.

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What is the molecular weight, density, and how many moles in
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Answer:

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<em>Density: at room temperature (25ºC) is 0.997g/mL</em>

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<em>2) Molecular weight: 182g/mol</em>

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Explanation:

1) The molecular formula of water is H_{2}O thus, the molecular weight is the sum of the weights of its atoms.

H: 1g/mol x 2 = 2g/mol

O: 16g/mol x 1 = 16g/mol

H_{2}O: 2g/mol + 16g/mol = 18g/mol

The density (δ) of water at room temperature (25ºC) is 0.997g/mL

Therefore, the weight (m) of 1mL of water is:

m = δ.V = 0.997\frac{g}{mL}. 1mL = 0.997g

Multiplying the mass by its molecular weight gives the number of moles:

\frac{0.997g }{18g/mol} = 0.55 moles

2) The molecular formula of benzophenone is C_{13}H_{10}O thus, the molecular weight is the sum of the weights of its atoms.

C: 12g/mol x 13 = 156g/mol

H: 1g/mol x 10 = 10g/mol

O: 16g/mol x 1 = 16g/mol

C_{13}H_{10}O: 156g/mol + 10g/mol + 16g/mol = 182g/mol

The density (δ) of water at room temperature (25ºC) is 1.11g/mL

Multiplying the mass by its molecular weight gives the number of moles:

\frac{0.04g }{182g/mol} = 2.2x10^{-4}moles

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