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dybincka [34]
3 years ago
7

What is the mass number of 19/9F? Your answer: A. 9 B. 10 C. 19 D. 28

Chemistry
1 answer:
dexar [7]3 years ago
8 0

the mass number of fluorine (F) is 19

C. 19

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Consider a hypothetical reaction in which A and B are reactants, and C and D are products. If 26 grams of A completely reacts wi
natali 33 [55]

Answer:

The answer to your question is: 24 grams of D

Explanation:

To answer this question we need to remember the Lavoisier law of conservation of mass, which says that in a chemical reaction matter is neither created nor destroyed.

This means that the amount of matter stays the same.

Then, the reaction is

                    A      +      B      ⇒       C      +      D

                 26 g         12 g             14 g            x

mass                              

of reactants      38 g                              ?          mass of products, but it must be

                                                                          equal to the mass of products

Then                14g + x = 38

                        x = 38 - 14

                        x = 24 g of D                                                        

4 0
3 years ago
Alcohol is a colorless odorless pungent drug that acts as a:
d1i1m1o1n [39]
As a Depressant, it acts like a depressant
4 0
2 years ago
Claims · Evidence • Reasoning A student
sashaice [31]
As with the properties of a substance, the changes that substances undergo can be classified as either physical or chemical. During physical changes a substance changes its physical appearance, but not its composition. The evaporation of water is a physical change.

(I searched that up but here’s an explanation with my own words that you can use):

Change in matter can be classified as a physical change as well as a chemical change due to the properties of substance. A physical change changes substance within its appearance but not its composition. For an example: The evaporation of water is a physical change.

There you go hopefully that helped
3 0
2 years ago
What is the atomic mass of 3NaCl
givi [52]

Answer:

35.453

Explanation:

8 0
2 years ago
A bottle containing air is initially at a temperature of 33 degrees C and a pressure of 0.81 atm. After being placed in the free
Georgia [21]

Answer:

The final pressure is 0.725 atm.

Explanation:

Gay Lussac's Law establishes the relationship between pressure and temperature of a gas when the volume is constant. This law says that when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases. That is, pressure and temperature are directly proportional quantities.

Mathematically, Gay-Lussac's law states that, when a gas undergoes a constant volume transformation, the quotient of the pressure exerted by the gas temperature remains constant:

\frac{P}{T}  =k

When analyzing an initial state 1 and a final state 2, the following is satisfied:

\frac{P1}{T1}  =\frac{P2}{T2}

In this case:

  • P1= 0.81 atm
  • T1= 33 C= 306 K
  • P2= ?
  • T2= 1 C= 274 K

Replacing:

\frac{0.81 atm}{306 K}  =\frac{P2}{274 K}

Solving:

P2=274 K*\frac{0.81 atm}{306 K}

P2= 0.725 atm

<u><em>The final pressure is 0.725 atm.</em></u>

4 0
3 years ago
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