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Alex Ar [27]
3 years ago
14

Please help me thank you! Stay safe

Chemistry
2 answers:
Nadusha1986 [10]3 years ago
5 0

Answer:

number 3

Explanation:

Tom [10]3 years ago
4 0

Explanation:

it's the third graph

values are put directly without scaling

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The total surface area for the Asia consisting of forest, cultivated land, grass land, and desert is approximately 4.46 x 107 km
tester [92]

Explanation:

We calculate the amount of carbon fixed as follows.

          455 \times 10^{3} kg/km^{2} \times 4.46 \times 10^{7} km^{2}

            = 2029.3 \times 10^{10} kg

\Delta H_{f}_{C_{6}H_{12}O_{6}} = -1273.1 kJ/mol

\Delta H_{f}_{CO_{2}} = -393.5 kJ/mol

\Delta H_{f}_{H_{2}O} = -285.8 kJ/mol

Hence, total \Delta H reaction will be as follows.

             \Delta H_{rxn} = (\Delta H_{f}_{C_{6}H_{12}O_{6}}) - 6(\Delta H_{f}_{CO_{2}}) - 6(\Delta H_{f}_{H_{2}O})

                           = -1273.1 kJ/mol - (6 \times 393.5 kJ/mol) - (6 \times 285.8 kJ/mol)

                           = 2802.7 kJ/mol

Therefore, calculate the number of moles of fixed carbon as follows.

           n_{c, fixed} = \frac{m_{c, fixed}}{\text{Molar mass of C in kg/mol}}

                   = \frac{4.55 \times 10^{5}kg km^{-2} year^{-1}}{12.01 \times 10^{-3} kg/mol}

                   = 3.786 \times 10^{7} mol km^{-2} year^{-1}

Thus, we can conclude that the annual enthalpy change resulting from the photosynthetic carbon fixation over the land surface is 3.786 \times 10^{7} mol km^{-2} year^{-1}.

7 0
3 years ago
You eat pizza for lunch. Which step in the digestion process causes a chemical change in the pizza?
Yuliya22 [10]
The answer should be your stomach mixes acid and enzymes with the food to break down protein in pizza.

The pizza will begin to break down in the acid. Causing a chemical change as you digest the pizza the nutrients will be absorbed and filtered.
8 0
3 years ago
What is Explosive Chemistry?
saw5 [17]

Answer:it reacts chemically to produce heat and gas with rapid expansion of matter. It is a rapid chemical reaction

Explanation:

7 0
3 years ago
How many moles is ( 1 x 10^9 ) molecules O2
Effectus [21]

Answer:

The answer is

1.66 \times  {10}^{ - 15}  \:  \: moles

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

n =  \frac{N}{L}   \\

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{1 \times  {10}^{9} }{6.02 \times  {10}^{23} }  \\

We have the final answer as

1.66 \times  {10}^{ - 15}  \:  \: moles

Hope this helps you

4 0
3 years ago
Which of the following is an example of chemical weathering?
Yuri [45]

Answer:

D

Explanation:

5 0
3 years ago
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