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Anuta_ua [19.1K]
3 years ago
15

The sun has been up for several hours, and it has been shining on these trees. What can the trees do because they are in sunligh

t? What does this mean for the number of energy storage molecules in the trees?
The trees can . . .
a give off carbon to the air. Giving off carbon allows them to make energy
storage molecules.
b give off carbon to the air. Giving off carbon uses up energy storage
molecules.
c take in carbon from the air. The carbon is used to make energy storage
molecules.
d take in carbon from the air. The carbon is used to break down energy storage molecules.
© 2018 The Regents of the University of California. All rights reserved. Permission granted to photocopy for classroom use. 1

2. These goats are eating grass on a sunny day. What is happening to the carbon in the air around the living things on the mountain? Is carbon moving into the air, moving out of the air, or both?
a Carbon is only moving into the air; it is not moving out of the air. b Carbon is moving into the air and out of the air at the same time. c Carbon is not moving into the air; it is only moving out of the air. d With this information, there is no way to know for sure.
Chemistry
1 answer:
Nonamiya [84]3 years ago
8 0

Answer:

1. C. take in carbon from the air. The carbon is used to make energy storage

molecules.

2. b Carbon is moving into the air and out of the air at the same time

Explanation:

Question 1:

Trees are plants, which are autotrophic organisms i.e. set of organisms that are capable of producing their own food via a process called PHOTOSYNTHESIS. This photosynthetic process produces sugars (glucose) in the presence of SUNLIGHT. According to this question, the sun has been up for several hours, and has been shining on these trees. This means that the trees can take in carbo dioxide (CO2) in order to perform the process of photosynthesis. Also, the number of energy storage molecules in the trees (ATP) will INCREASE.

What can the trees do because they are in sunlight? What does this mean for the ?

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The correct answer is for mass of Na₃PO₄ 39.7 g.

Given  : 1) Molarity of Na⁺ ions = 1.00 M or 1.00 \frac{mol}{L}

2) Volume of solution = 725 mL

Converting volume of solution from mL to L :

Conversion factor : 1 L = 1000 mL  

Volume of solution = 725 mL * \frac{1L }{1000 mL}

Volume of solution = 0.725 L


Following steps can be  done to find mass of  :

<u>Step 1 : Write the dissociation reaction of Na₃PO₄ .</u>

Na_3PO_4    3 Na^+  +  PO_4^3^-

<u>Step 2:  Find moles of Na⁺ ions : </u>

Mole of Na⁺ ions can be calculated using molarity formula  which is :Molarity (\frac{mol}{L} ) = \frac{mole of Na^+ }{volume of solution }

Plugging value of Molarity and volume

1.00 \frac{mol}{L} = \frac{Mole of Na^+ ions}{0.725 L}

Multiplying both side by 0.725 L

1.00 \frac{mol}{L}* 0.725 L = \frac{mole of Na^+ ions}{0.725 L} * 0.725 L

<em>Mole of Na⁺ ions = 0.725 mol</em>

<u>Step 3: Find mole ratio of Na₃PO₄ : Na⁺ :</u>

Mole ratio  is found from coefficients from balanced reaction as:

Mole of Na₃PO₄ in balanced reaction = 1

Mole of Na⁺ ion =  3

<em>Hence mole ratio of Na₃PO₄: Na⁺ = 1 : 3 </em>

<u>Step 4 : To find mole of Na₃PO₄ </u>

Mole of Na₃PO₄ can be calculated using mole of Na⁺ ion and Mole ratio as :

Mole of Na_3PO_4= Mole of Na^+  * Mole ratio

Mole of Na_3PO_4 = 0.725 mol  *  \frac{1 mole of Na_3PO_4}{3 mole of Na^+ }

<em>Mole of Na₃PO₄ =  0.242 mol </em>

<u>Step 5 : To find mass of Na₃PO₄</u>

Mole of Na₃PO₄ can be converted to mass of Na₃PO₄ using  molar mass of Na₃PO₄ as :

Mass (g) = mole (mol) * molar mass \frac{g}{mol}

Mass of Na_3PO_4 =  0.242 mol * 163.94 \frac{g}{mol}

Mass of Na₃PO₄ = 39.619 g

<u>Step 6 : To round off mass of Na₃PO₄ to correct sig fig .</u>

The sig fig in 750 mL and 1.00 M is 3 . So mass of Na₃PO₄ can rounded to 3 sig fig as :

Mass of Na₃PO₄ = 39.7 g


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