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Molecular Weight CalculatorThis online calculator you can use for computing the average molecular weight (MW) of molecules by entering the chemical formulas (for example C3H4OH(COOH)3 ). Or you can choose by one of the next two option-lists, which contains a series of common organic compounds (including their chemical formula) and all the elements. The molecular mass calculator will recognize the entered formula's, which are included in the list of organic compounds. The calculator handles at most two different bracket levels. Make sure you enter the molecule of crystallization at last (e.g. C2HCl3O.H2O ). !!!Lenntech BV cannot be held responsible for errors in the calculation,
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Enter the molecular formula of the substance. It will calculate the total mass along with the elemental composition and mass of each element in the compound. Use uppercase for the first character in the element and lowercase for the second character. Examples: Fe, Au, Co, Br, C, O, N, F. Using the periodic table of elements, find the atomic number of the element with mass numbers that need to be calculated. The atomic number of an element is equivalent to its number of protons. For example, the atomic number of sodium is 11. Thus, its number of protons is 11. Find the number of neutrons. ATOMIC MASSES OF THE ELEMENTS. Symbol Element Atomic Number Atomic Mass Symbol Element Atomic Number Atomic Mass Ac Actinium 89 227.03. Hg Mercury 80 200.59 Al Aluminum 39 Mo Molybdenum 42 95.94.
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Volume = a shape in three dimensions
Shapes are flat. If you take a shape and give it three dimensions, it has volume.
A three-dimensional form has volume.Volume (three-dimensionality) can be simulated in a two-dimensional work (like a painting).
This self portrait by Rembrandt is an example of simulated, or implied volume. The face looks three-dimensional. In actuality, however, it is a two-dmensional (flat) artwork, a print.
Rembrandt Van Rijn Self-portrait in a cap, with eyes wide open, etching and burin, 1630
Signed and dated bottom center: RHL 1630. A copy is kept in the: Rijksmuseum Amsterdam. Source: Dake, wikipedia. com
This group of sculptures by Magdalena Akanowicz have actual volume; they are three-dimensional. Because the figures are open they allow a glimpse of what the inside of a sculpture looks like, (including welded together sections of separate castings). This openess gives a sense of volume. If they were closed, they would appear to have density, or mass.
Magdalena Akanowicz Nierozpoznani ('The Unrecognised Ones') 2002
Cytadela park, Poznań, Poland (whole installation)photo by Radomil
Imagine a drawing of a glass. The drawing would be flat (two-dimensional) But it would look like it was three-dimensional (simulated or implied volume). Now imagine an actual glass (that is empty). The glass would have volume (it would be three-dimensional).
Mass = volume + density
Imagine that glass again, this time filled with water. Now the glass has mass, or density.
The density of a material is scientifically defined as its mass per unit of volume. For example, a rock has more density than a cotton ball.
Imagine three containers. The first one is empty (filled with air); it has volume. The second container is filled with feathers. Now the container has density, or mass. The third container is filled with sand. The third container has more density than the second one.
In art it’s easier to think of density as actual or perceived weight.
These ancient Olmec sculptures iillustrate the concept of density, or mass. They appear to be (and actually are) very heavy in weight. They are very large and there are several of them (17 have been unearthed). You can imagine encountering a group of these colossol heads, and the sense of power they convey.
Monument 6, San Lorenzo Tenochtitlan Olmec civilization 1500 BCE to about 400 BCE
exhibited at the Museo Nacinal de Antropología e Historia, Mexico Image: Maunus
Mass Of Elements In Periodic Table
Monument 1, one of four colossal Olmec heads at La Venta. 9.8 ft (3 meters) tall. circa 900 BCE -400 BCE
La Venta Park, Villahermosa, Mexico Image: Hajor
Implied Mass
Mass or volume can be simulated in two-dimensional work though the use of:
modeling and shading
color--darker and more intense colors appear heavier
placement--objects closer to the lower edge of the picture plane appear heavier
size--larger objects appear heavier
overlapping objects creates a sense of space
Implied Mass: Valentina Kulagina
This poster from 1930 is a good example of implied mass. The soldiers of the Russian Army are portrayed as huge figures marching from the factories to fight the war. Notice the size, color and placement of the figures. In contrast, the airplanes of the royalists are shown as light, small, and overwhelmed by the figures.
Valentina Kulagina To Defend USSR 1930
Image Source: http://www.smashingmagazine.com/2010/06/13/100-years-of-propaganda-the-good-the-bad-and-the-ugly/