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Alex73 [517]
3 years ago
9

A 12.2-g sample of x reacts with a sample of y to form 78.9 g of xy. what is the mass of y that reacted?

Chemistry
1 answer:
Sonja [21]3 years ago
4 0
We will assume that the only reactants are x and y and that the only product is xy.

Based on the law of mass conservation, mass is an isolated system that can neither be created nor destroyed.

Applying this concept to the chemical reaction, we will find that the total mass of the reactants must be equal to the total mass of the products,
therefore:
mass of x + mass of y = mass of xy
12.2 + mass of y = 78.9
mass of y = 78.9 - 12.2 = 66.7 grams
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3 0
3 years ago
A pressure of 745 mm hg equals select one:
Flura [38]
As we know that,

                                        1 mm Hg  =  1 torr
So,
                                    745 mm Hg  =  X

                         X  =  (745 mm Hg × 1 torr) ÷ 1 mm Hg

                         X  =  745 torr

Also,
                                    1 mm Hg  =  133.325 Pa
So,
                                    745 mm Hg  =  X

                         X  =  (745 mm Hg × 133.325 Pa) ÷ 1 mm Hg

                         X  =  99327 Pa

Result:
          Option-A (745 torr) is the correct answer.
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Explanation:

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Answer:

Answer is below with the steps in order

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6) Alveoli receive oxygen pass to blood

9) Oxygen passes into the blood

11) Alveoli receives carbon dioxide from the blood

12) Oxygen-rcih blood flows to the heart

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