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3 years ago

C + 2ZnO → CO2 + 2zn

Chemistry

1 answer:

leva [86]3 years ago

3 0

Answer:

36.5 g CO2

Explanation:

First, Write a Balanced Equation

C + 2 ZnO → CO2 + 2 Zn

Useful Information,

MW of ZnO = 81.41 g

MW of CO2 = 44.01 g

135 g ZnO x (1 mol ZnO / 81.41 g ZnO) x (1 mol CO2/2 mol ZnO) x ( 44.01 g CO2 / 1 mol CO2 ) = 36.5 g CO2

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A sample of sugar (C12H22O11) contains 1.505 × 1023 molecules of sugar. How many moles of sugar are present in the sample?

saveliy_v [14]

Answer: Option (a) is correct.

Explanation:

Molecules of sugar given = $1.505 \times 10^{23}$

According to Avogadro's number it is known that 1 mole contains $6.023 \times 10^{23}$ .

Therefore, calculate the moles of sugar present in the sample as follows.

Number of moles = $\frac {1.505 \times 10^{23}}{6.023 \times 10^{23}}$

= 0.25 mol

Thus, the moles of sugar present in the sample is 0.25 mol.

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3 years ago

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The Earth's surface is colder than the air above it, what will happen to the air?

Nitella [24]

Answer:

If the earth's surface is cold, warm air above it will lose heat energy to the cold surface below and the now cool air will remain close to the surface. If a damp surface is warmer than the air above it, some water will evaporate, and the air above the surface will be heated.

Explanation:

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3 years ago

The mountain peaks shown below were initially formed millions of years ago through the processes of folding, faulting, and overt

algol [13]

Answer:

A. Erosion

Explanation:

Erosion is the process in which soil and rock are worn away and transported by wind or water and transported to another location.

The image below shows how water has eroded a coastline.

B is wrong. Chemical weathering is the disintegration of rocks by reactions with water and the acids dissolved in it

C is wrong. Deposition is the process in which sediments carried by wind, water or ice are deposited at another location.

D is wrong. Physical weathering is the breakdown of rocks and soil by physical processes like the freezing of ice in the cracks of rocks.

6 0

3 years ago

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The density of ethanol, C 2H 5OH, is 0.789 g/mL. How many milliliters of ethanol are needed to produce 25.0 g of CO 2 according

gogolik [260]

Answer:

11.1mL

Explanation:

The reaction expression is given as:

C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

Given parameters:

density of ethanol = 0.789g/mL

mass of CO₂ = 25g

Unknown:

Volume of ethanol = ?

Solution:

First find the number of moles of the CO₂ from the given mass;

Number of moles = $\frac{mass}{molar mass}$

Molar mass of CO₂ = 12 + 2(16) = 44g/mol

Number of moles = $\frac{25}{44}$ = 0.57mol

Then;

Find the number of moles of ethanol used;

3 moles of CO₂ is produced from 1 mole of ethanol;

0.57mole of CO₂ will be produced from $\frac{0.57}{3}$ = 0.19mole of ethanol

Now;

Find the mass of the ethanol from the given mole;

Mass of ethanol = number of moles x molar mass

Molar mass of ethanol = 2(12) + 5(1) + 16 + 1 = 46g/mol

Mass of ethanol = 0.19 x 46 = 8.74g

Then;

Density is the mass per unit volume of a substance;

Density = $\frac{mass}{volume}$

Volume = $\frac{mass}{density}$

Volume = $\frac{8.74}{0.789}$ = 11.1mL

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3 years ago

Which biome has leaves that change color and fall off as winter approaches?

Galina-37 [17]

Answer:

Option (A)

Explanation:

The temperate forest usually covers the tropical and the taiga region. The trees in this forest region experience all the four seasons namely summer, autumn, winter and spring. It comprises approximately 25% of the total forest-covered region on earth. The leaves of these trees change color during the autumn season, which eventually falls off during the winter season, and again, new leaves grow back during the spring season. This enables the plants to survive and go through the cold temperature in the winter.

Thus, the correct answer is option (A).

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3 years ago

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