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3 years ago

15

Consider the unbalanced equation for the oxidation of aluminum. _Al + _O2 ------> _Al2O3 Which sequence of coefficients shoul

d be placed in the blanks to balance this equation? * 2 points 2,3,1 1,3,2 4,3,2 3,2,3

1 answer:

Nimfa-mama [501]3 years ago

6 0

Answer:

4Al + 3O2-> 2Al2O3 :))))

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1. The mass of 6.45 x 1022 atoms C

Fed [463]

Answer:

$\large \boxed{\text{1.29 g}}$

Explanation:

We must convert atoms of C to moles of C and then to grams of C.

1. Convert atoms to moles

$\text{Moles of C} = 6.45 \times10^{22}\text{ atoms C} \times \dfrac{\text{1 mol C}}{6.022 \times\ 10^{23} \text{ atoms C}} = \text{0.1071 mol C}$

2. Convert moles to grams

$\text{Mass of C} = \text{0.1071 mol C} \times \dfrac{\text{12.01 g C}}{\text{1 mol C}} = \text{1.29 g C}\\\text{The mass of C is $\large \boxed{\textbf{1.29 g}}$}$

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3 years ago

Iron has a density of 7.9 space straight g divided by cm cubed. How much mass is in a 10 space cm cubed sample of iron? Question

dezoksy [38]

Answer:

79 g

Explanation:

Density (d) of iron = 7.9 g/cm³

Volume of the iron (V) = 10 cm³

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Solution:

Formula will be used

d = m/V

As we have to find mass so rearrange the above equation

m = dV . . . . . . . . . . . (1)

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4 years ago

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Answer:

1. 2,3,2

2. 4,5,2

3. 3,1,1

Explanation:

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Decreasing incresing

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atroni [7]

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I hope this helps you!!!

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3 years ago