The elementary inverse reaction A+B→C+D takes place in the liquid phase and at constant temperature as follows: Equal volumetric flows of two streams, the first containing 0.020 moles A/litre and the second containing 1.4moles B/litre, constitute the feed to a 30-litre volume of a full-mixing continuous-work reactor. The outlet of the reactor is the inlet to a subsequent piston flow reactor (in series reactors). In the outlet stream from the first reactor the concentration of product C was measured and found to be equal to 0,002 mol/l.
-What should be the volume of the piston flow reactor so that the array achieves a conversion efficiency of 35%?

To pack A into B and store the result in C, the following operations can be performed.

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The manipulator used to establish a field width for the value that follows it is setw from the iomanip library in C++. It allows you to specify the number of characters that should be used for the output of the value.

For example, if you want to output a value with a field width of 5, you would use set w(5). This will ensure that the value is formatted with 5 characters, adding spaces as necessary to achieve the desired width. So the correct option in this case would be "set field setw iomanip". The term "set field set w iomanip" does not make sense in this context.
The manipulator used to establish a field width for the value that follows it is "setw". This term is part of the iomanip library in C++. So, the correct answer is "setw". The other terms mentioned in the question, such as "field_width", "set field", and "setw ioman ip", are not relevant to the context of the question.

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The manipulator in question is called "setw" and it is a part of the "iomanip" library in C++. option c is correct.

This manipulator is used to set the field width for the value that follows it. The value can be a string, integer, or any other data type.

The purpose of setw is to make the output more readable and organized by aligning the data in columns. For example, if you are printing a table with multiple columns, you can use setw to set the width of each column so that the data is aligned and easy to read.

The syntax for using setw is as follows:

cout << setw(10) << "Hello";

In this example, setw(10) sets the field width to 10 characters for the string "Hello". This means that "Hello" will be printed with a width of 10 characters, even if it is shorter than that. If the string is longer than 10 characters, it will be truncated to fit within the allotted space.

Overall, setw is a useful manipulator for formatting output in C++. It helps to make the output more readable and organized, which is important when dealing with large amounts of data.

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Note: The complete question would de as bellow,

This manipulator is used to establish a field width for the value that follows it:

a)field_width

b)set field

c)setw

d)iomanip

e)None of these