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3 years ago

Cuál es la masa molar del carbono?

Chemistry

1 answer:

maks197457 [2]3 years ago

6 0

Answer:

12.01 g

Explanation:

Si vas al simbolo de Carbono en la tabla periodica, cual es "C" ,el numero debajo del simbolo te dice que su masa molar es 12.01 g

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How do you solve for x?

Ad libitum [116K]

Answer:

substitution is the best method or collecting like terms

Explanation:

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3 years ago

1. Aluminium reacts with chlorine to produce aluminium chloride. The balanced reaction is:

Anton [14]

Answer:

Explanation:

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3 years ago

2Al+ Fe203 Al203 +2Fe

leonid [27]

Answer:

229 g Al₂O₃; 243 g Fe₂O₃

Explanation:

We have the masses of two reactants, so this is a limiting reactant problem.

We know that we will need a balanced equation with masses, moles, and molar masses of the compounds involved.

Step 1. Gather all the information in one place with molar masses above the formulas and masses below them.

M_r: 26.98 159.69 101.96

2Al + Fe₂O₃ ⟶ Al₂O₃ + 2Fe

Mass/g: 121 601

===============

Step 2. Calculate the moles of each reactant

Moles of Al = 121 × 1/26.98

Moles of Al = 4.485 mol Al

Moles of Fe₂O₃ = 601× 1/159.69

Moles of Fe₂O₃ = 3.764 mol Fe₂O₃

===============

Step 3. Identify the limiting reactant

Calculate the moles of Al₂O₃ we can obtain from each reactant.

From Al

The molar ratio is 1 mol Al₂O₃:2 mol Al

Moles of Al₂O₃ = 4.485 × 1/2

Moles of Al₂O₃ = 2.242 mol Al₂O₃

From Fe₂O₃:

The molar ratio is 1 mol Al₂O₃:1 mol Fe₂O₃

Moles of Al₂O₃ = 3.764 × 1/1

Moles of Al₂O₃ = 3.764 mol Al₂O₃

The limiting reactant is Al because it gives the smaller amount of Al₂O₃.

The excess reactant is Fe₂O₃.

===============

Step 4. Calculate the mass of Al₂O₃ formed

Mass of Al₂O₃ = 2.242 × 101.96

Mass of Al₂O₃ = 229 g Al₂O₃

===============

Step 5. Calculate the moles of Fe₂O₃ reacted

The molar ratio is 1 mol Fe₂O₃:2 mol Al:

Moles of Fe₂O₃ = 4.485 × ½

Moles of Fe₂O₃ = 2.242 mol Fe₂O₃

===============

Step 6. Calculate the moles of Fe₂O₃ remaining

Moles remaining = original moles – moles used

Moles remaining = 3.764 – 2.242

Moles remaining = 1.521 mol Fe₂O₃

==============

Step 7. Calculate the mass of Fe₂O₃ remaining

Mass of Fe₂O₃ = 1.521 × 159.69/1

Mass of Fe₂O₃ = 243 g Fe₂O₃

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4 years ago

Use scientific (exponential) notation to express the following quantities in terms of the SI base units in Table 1.3 :

lisov135 [29]

Answer:

a) 0.13 g = 0.13X0.001 kg = 1.3 X 10⁻⁴ kg

b) 232 Gg = 232 X 1000000 kg = 2.32 X 10⁸ kg

c) 5.23 pm = 5.23 X 10⁻¹² m

d) 86.3 mg = 86.3 X 10⁻⁶Kg = 8.63 X 10⁻⁵Kg

e) 37.6 cm = 37.6 X 10⁻² m = 3.76 X 10⁻¹m

f) 54 = 5.4 X 10¹

g) 1 Ts = 10¹² seconds

h ) 27 ps = 27 X 10⁻¹² s= 2.7 X 10⁻¹¹ s

i) 0.15 mK = 1.5 X10⁻⁴ K

Explanation:

A scientific notation is a representation of any number which is very large or very small. It is simplification of writing a number.

The SI units of

i) weight = Kg

ii) length = meter

iii) time = second

iv) temperature = K

a) 0.13 g = 0.13X0.001 kg = 1.3 X 10⁻⁴ kg

b) 232Gg

1 Gg = 1000000 kg

232 Gg = 232 X 1000000 kg = 2.32 X 10⁸ kg

c) 5.23 pm

1 pm = 10⁻¹² m

5.23 pm = 5.23 X 10⁻¹² m

d) 86.3 mg

1mg = 10⁻⁶Kg

86.3 mg = 86.3 X 10⁻⁶Kg = 8.63 X 10⁻⁵Kg

e) 37.6cm

1 cm = 10⁻² m

37.6 cm = 37.6 X 10⁻² m = 3.76 X 10⁻¹m

f) 54 (no units)

54 = 5.4 X 10¹

g) 1 Ts = 10¹² seconds

h ) 27 ps

1 ps = 10⁻¹² s

27 ps = 27 X 10⁻¹² s= 2.7 X 10⁻¹¹ s

i) 0.15 mK

1mK = 10⁻³ K

0.15 mK = 1.5 X10⁻⁴ K

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3 years ago

What are some ways that groundwater is used in the United States currently?

FrozenT [24]

Ground is used for agriculture, sink water, hose water, and even drinking water (from the aqueducts).

7 0

3 years ago

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