Molecular mass is the mass of a single molecule of a compound. It can be calculated by summing the atomic masses of each nuclide present in the molecule and is measured in Daltons (Da or u). The atomic mass of all the known chemical elements can be found in the periodic table. For a bulk of molecules, such as a pure chemical compound supplied by Tocris, molecular weight refers to a weighted average of the molecules in the compound.

In practice, it is very difficult to accurately measure molecular weight of a compound. Molar mass and formula weight are commonly used as numerical approximations for molecular weight. Molar mass is the mass of a substance containing 1 mol of molecules; it has the unit of g/mol. The molar mass of a compound with a given chemical formula can be calculated as the sum of the atomic weights of all atoms appearing in the formula and this number is also known as the formula weight of the compound.

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In general, the molecular mass, molecular weight, molar mass, or formula weight of a chemical compound can be used when using a molarity or concentration calculator for preparing a solution. In biochemistry, Daltons and g/mol (gram per mole) can be used interchangeably i.e. 1 Dalton = 1 g/mol.

Molar concentration (also known as molarity) is the amount of a solute (in moles) per unit volume of solution. It is denoted by the unit M, and 1 M = 1 mol/L. Please see the example above for how to use the Tocris molarity calculator to calculate the molarity of a solution.

The solution dilution calculator tool calculates the volume of stock concentrate to add to achieve a specified volume and concentration. The calculator uses the formula M1V1 = M2V2 where "1" represents the concentrated conditions (i.e., stock solution molarity and volume) and "2" represents the diluted conditions (i.e., desired volume and molarity). To prepare a solution of specific molarity based on mass, please use the Mass Molarity Calculator. To dilute a solution of concentrated acid or base of known w/w% strength, please use the Acid & Base Molarity Calculator.

The mole is the unit of measurement for amount of substance. It is defined as exactly 6.022140761023 (the Avogadro constant) particles, which may be atoms, molecules, ions, or electrons. The unit symbol is "mol".

Molar mass is the mass of 1 mole of a substance, given in g/mol. The value of molar mass of a particular substance is near identical to its molecular weight (MW or M.W., sometimes also called formula weight - FW or F.W.), albeit the latter is used either without any unit or with a unit called the Dalton (Da).

A stock solution is a concentrated solution that will be diluted to some lower concentration, which is often referred to as a working or final concentration, for actual use. Stock solutions are used to save preparation time, reduce storage space, and improve the accuracy with which working lower concentration solutions are prepared.

Absorbance is a number that measures the attenuation of the transmitted light power in a solution. It is defined as the common logarithm of the ratio of incident to transmitted light power through a solution.

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The app can use a3132132132112345565989879846 tabular dataset or individual data lists as the input. In the first case, click the "Tabular Input" heading and provide the data. In the latter case, the required number of empty list forms has to be prepared up front. This can be done by filling the number of lists to be prepared in the "Number of lists" field followed by clicking the "Set" button (all existing lists will be discarded). To add a list form to an existing set of forms, click the large plus button located just after the last list form.

The app expects an input in the form of simple item lists i.e. with one item per line. If the source data are to be loaded from files, the files should be plain text files (no formatting) containing one item per each line or comma-separated items.

The app can import a tabular dataset wherein the list items are organized column-wise and separated with delimiters in each row. The delimiter can be one of the characters tab, comma or semicolon and has to be properly chosen before reading the data into the app with the "Read Data" button. You can directly copy - paste data from Microsoft Excel or other spreadsheet programs. Choose tab as the delimiter in such cases. If the source data are to be loaded from a file, the file should be a plain text file containing delimiter-separated values. After clicking the "Read Data" button, the values should get properly distributed into individual input lists. If not, check the delimiter choice and appearance of the data. The problem may also be caused by a presence of additional text lines preceding the data. Such lines have to be removed manually.

Division is one of the basic arithmetic operations, the others being multiplication (the inverse of division), addition, and subtraction. The arithmetic operations are ways that numbers can be combined in order to make new numbers. Division can be thought of as the number of times a given number goes into another number. For example, 2 goes into 8 4 times, so 8 divided by 4 equals 2.

Generally, a division problem has three main parts: the dividend, divisor, and quotient. The number being divided is the dividend, the number that divides the dividend is the divisor, and the quotient is the result:

One way to think of the dividend is that it is the total number of objects available. The divisor is the desired number of groups of objects, and the quotient is the number of objects within each group. Thus, assuming that there are 8 people and the intent is to divide them into 4 groups, division indicates that each group would consist of 2 people. In this case, the number of people can be divided evenly between each group, but this is not always the case. There are two ways to divide numbers when the result won't be even. One way is to divide with a remainder, meaning that the division problem is carried out such that the quotient is an integer, and the leftover number is a remainder. For example, 9 cannot be evenly divided by 4. Instead, knowing that 8 ÷ 4 = 2, this can be used to determine that 9 ÷ 4 = 2 R1. In other words, 9 divided by 4 equals 2, with a remainder of 1. Long division can be used either to find a quotient with a remainder, or to find an exact decimal value.

To perform long division, first identify the dividend and divisor. To divide 100 by 7, where 100 is the dividend and 7 is the divisor, set up the long division problem by writing the dividend under a radicand, with the divisor to the left (divisorvdividend), then use the steps described below:

To continue the long division problem to find an exact value, continue the same process above, adding a decimal point after the quotient, and adding 0s to form new dividends until an exact solution is found, or until the quotient to a desired number of decimal places is determined.

The calculator solution will show work using the quadratic formula to solve the entered equation for real and complex roots. Calculator determines whether the discriminant \( (b^2 - 4ac) \) is less than, greater than or equal to 0.

Our ergonomic assessment tool is a quick and easy solution for determining the ideal height for your sit-stand desk, ergonomic chair, keyboard tray, and monitor arm. Simply enter your own height. Always add your shoe height to your height (typically one inch but add more for high heals) to get correct measurements. The desk height calculator will provide a set of reliable baseline measurements to help you work with maximum comfort and efficiency.

Our calculator allows you to check your solutions to calculus exercises. It helps you practice by showing you the full working (step by step integration). All common integration techniques and even special functions are supported.

The Integral Calculator supports definite and indefinite integrals (antiderivatives) as well as integrating functions with many variables. You can also check your answers! Interactive graphs/plots help visualize and better understand the functions.

Enter the function you want to integrate into the Integral Calculator. Skip the "f(x) =" part and the differential "dx"! The Integral Calculator will show you a graphical version of your input while you type. Make sure that it shows exactly what you want. Use parentheses, if necessary, e. g. "a/(b+c)".

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