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11. How many grams of O2 are required to produce 36.9 grams of ZnO? 22n +102 → 2ZnO

Fittoniya [83]

Answer:

Mass = 7.2 g

Explanation:

Given data:

Mass of ZnO = 36.9 g

Mass of oxygen needed = ?

Solution:

Chemical equation:

2Zn + O₂ → 2ZnO

Number of moles of ZnO:

Number of moles = Mass/ molar mass

Number of moles = 36.9 g/81.38 g/mol

Number of moles = 0.45 mol

Now we will compare the moles of ZnO with oxygen:

ZnO : O₂

2 : 1

0.45 : 1/2 × 0.45 = 0.225

Mass of oxygen:

Mass = number of moles × molar mass

Mass = 0.225 mol × 32 g/mol

Mass = 7.2 g

3 0

3 years ago

What causes the different colors of layers in a sedimentary rock? A. the cooling process of the magma B. the weather in the area

OLga [1]

Different colors of sedimentary rock are determined by the environment where they are located. For example, red rocks form where oxygen is present. Darker sediments form when the environment is oxygen poor.

So, basically, the weather and surroundings of the rock, so B.

4 0

2 years ago

Which of the following best defines molar heat capacity? Group of answer choices The quantity of heat required to raise the temp

motikmotik

Answer: The quantity of heat required to raise the temperature of 1 mole of a substance by 1K

Explanation:

As the temperature change is same in all scales of temperature.

The quantity of heat required to raise the temperature of a substance by one degree Celsius or one degree Kelvin or one degree Fahrenheit is called the heat capacity.

The quantity of heat required to raise the temperature of 1 gram of substance by one degree Celsius one degree Kelvin or one degree Fahrenheit is called as specific heat capacity.

The quantity of heat required to raise the temperature of 1 mole of substance by one degree Celsius or one degree Kelvin or one degree Fahrenheit is called as molar heat capacity.

8 0

3 years ago

Answer me short answer

Zepler [3.9K]

Explanation:

B. 1) Tritium is the isotope of Hydrogen (H).

2) Mass of an Electron is 9.10938356 × 10-³¹ Kg.

3) Molecular mass of Carbon dioxide (CO2)

=> Molecular mass of carbon = 12g

Molecular mass of oxygen= 16g

molecular mass of CO2 = [12 + (16 X 2)]g

= (12 + 32)g

= 44 g

4) Dalton has given its Atomic Theory in the year 1803.

5) Nucleus is discovered by

= Ernest Rutherford discovered the nucleus of the atom in 1911.

hope this helps you.

6 0

3 years ago

Several methanol (CH3OH) dimers are drawn below, and several proposed intermolecular bonding interactions are highlighted in gre

Anon25 [30]

Answer:

Posible dimers structures: B) and D) (Figure 1)

Explanation:

The correct dimer structures are the ones that have a right intermolecular bonding interacction. In this case we will have hydrogen bonding. This type of interaction is due to the negative polarization in the oxygen and the positive polarization in the hydrogen. (Figure 2)

So, a correct dimer structure is posible if we have an interaction from the negative part (oxygen) to the positive part (hydrogen). The only structures that have this type of interactions are B and D.

3 0

3 years ago

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