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Annette [7]
2 years ago
11

The analysis of a compound gives the following percent composition by mass:

Chemistry
1 answer:
boyakko [2]2 years ago
5 0

Answer:

C15 H31 O4 S

Explanation:

molecular formula is also the same because the value of "n" is 1

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As a chemist for an agricultural products company, you have just developed a new herbicide,"Herbigon," that you think has the po
coldgirl [10]

i hope i helped for this problem

7 0
3 years ago
the table shows the concentration of a reactant in the reaction mixture over a period of time. what is the average rate of the r
Stella [2.4K]

The question is missing the table. Here is the complete question.

The tableshows the concentration of a reactant in the mixture over a period of time.

Reactant Concentration

Time (s)         Concentration (M)

    0                       1.8

  210                      1.2

 450                      0.8

 580                      0.6

 720                      0.4

What is the average rate of reaction over the first 450 seconds?

A. 1.6x10^{-3} M

B. 1.9x10^{-3} M

C. 2.0x10^{-3} M

D. 2.2x10^{-3} M

Answer: D. 2.2x10^{-3} M

Explanation: The average rate of a reaction is the rate of change of the concentrations (of reactants or products) in a period of time:

average = - ΔC/Δt

In this case, concentration is negative because it's related to reactant, since its concentration dimishes while the concentration of product increases.

For the first 450 seconds:

Average = \frac{-(0.8 - 1.8)}{450 - 0}

Average = \frac{1}{450}

Average = 0.0022

or

Average = 2.2x10^{-3}

So, <u>the Average Rate of the reaction is 2.2x</u>10^{-3}<u>M</u>

6 0
3 years ago
What is the chemical formula for Copper (II) nitrate?
Nat2105 [25]

Answer:

The answer to your question is  Cu(NO₃)₂

Explanation:

To write the chemical formula of a molecule:

1.- Look for the symbols of the elements

Copper = Cu        has an oxidation number of +2.

Nitrate = NO₃⁻¹    nitrate is a polyatomic ion so it is composed of nitrogen,

                            oxygen and its oxidation number is -1.

2.- Write the chemical formula and interchange the oxidation numbers.

             Cu⁺² + NO₃⁻¹   ⇒   Cu(NO₃)₂

6 0
2 years ago
A 0.80 L sample of gas has a temperature of 27°C and a pressure of 0.925 atm. How many moles of gas are present?
ololo11 [35]

Answer:

n= 0.03 moles

Explanation:

Using the ideal gas law:

PV=nRT

nRT=PV

n= PV/RT

 n: moles

 P: pressure in atm

 V= volume in L

 R= Avogadro's constant = 0.0821

 T= Temperature in K => ºC+273.15

n= (0.925 atm)(0.80 L) / (0.0821)(300.15 K)

n= 0.03 moles

6 0
3 years ago
Which part of making a solution always releases energy?
emmainna [20.7K]
<span>The part of making a solution that always releases energy is the overall change in forming the solution. The answer is letter D. Although letters A, B and C can be viable answers but, it is not always the case. There are some substances that when you mix or separate them requires more energy or less energy. An example would be w</span>hen the formation (or enthalpy of formation) of carbon dioxide is negative, it means that it releases heat to the surroundings. When it releases heat to the surroundings, the reaction is exothermic. Another example is when you mix baking soda and muriatic acid, the resulting mixture is colder. When it is cold, it means that the reaction is endothermic. So the best answer is letter D.
4 0
3 years ago
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