It is expressed in grams per mole. About 20% of manufactured HF is a byproduct of fertilizer production, which generates hexafluorosilicic acid. These relative weights computed from the chemical equation are sometimes called equation weights. 816–819. [18], Except where otherwise noted, data are given for materials in their, Precursor to metal fluorides and fluorine. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. Hafnium element has 72 protons, 106 neutrons and 72 electrons. National Institute for Occupational Safety and Health, Ullmann's Encyclopedia of Industrial Chemistry, Facts About Hydrogen Fluoride (Hydrofluoric Acid), CDC - NIOSH Pocket Guide to Chemical Hazards, Hydrogen chalcogenides (Group 16 hydrides),, Pages using collapsible list with both background and text-align in titlestyle, Articles containing unverified chemical infoboxes, Creative Commons Attribution-ShareAlike License, colourless gas or colourless liquid (below 19.5 °C), Boiling points of the hydrogen halides (blue) and, This page was last edited on 27 November 2020, at 21:34. For example, in oil refineries "alkylate", a component of high-octane petrol (gasoline), is generated in alkylation units, which combine C3 and C4 olefins and iso-butane. HF Molar mass: not applicable (see hydrogen fluoride) Appearance Colorless solution Density: 1.15 g/mL (for 48% soln.) Definitions of molecular mass, molecular weight, molar mass and molar weight. Source(s): Lv 4. The potassium bifluoride is needed because anhydrous HF does not conduct electricity. The melting point of Hafnium metal is 2233 ̊C. Several thousand tons of F2 are produced annually. 0 0. Exposure requires immediate medical attention. The reason is that the molar mass of the substance affects the conversion. density. molar mass and molecular weight. [16], HF serves as a catalyst in alkylation processes in refineries. 001. mass to molar. which forms an extremely acidic liquid (H0 = −11). Molar Mass Hf. 1.00794 + 18.9984032, Note that all formulas are case-sensitive. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. Convert grams HF to moles  or  moles HF to grams, Molecular weight calculation: It is used in the majority of the installed linear alkyl benzene production facilities in the world. Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance. But HF on its own will have a molar mass of 20 (atomic mass of F=19 atomic mass of H=1) 1 0. Molar mass of HF = 20.0063432 g/mol. Perfluorinated carboxylic acids and sulfonic acids are produced in this way. Mass percent essentially means g of HF/total grams of solution (x100%). ›› HF molecular weight. The electrowinning of aluminium relies on the electrolysis of aluminium fluoride in molten cryolite. Convert grams HF to moles or moles HF to grams. 8.25 M = … common chemical compounds. HF. Our calculator can also find the mass of substance you need to add to your solution to obtain a desired molar concentration, according to the formula . During the preparation of the electrolytes in electrochemistry, you can use either the molar concentration or the mass concentration (also designated wt%). [14], HF reacts with chlorocarbons to give fluorocarbons. The intermediate in this process is vinyl fluoride or fluoroethylene, the monomeric precursor to polyvinyl fluoride. The process involves dehydrogenation of n-paraffins to olefins, and subsequent reaction with benzene using HF as catalyst. Weights of atoms and isotopes are from NIST article. F−]. HF Dump it into your beaker. [15], 1,1-Difluoroethane is produced by adding HF to acetylene using mercury as a catalyst.[15]. It is a constant property of each substance - for example, the molar mass of water is approximately equal to 18 g/mol. Hafnium. Molar mass of HF is 20.006343 ± 0.000070 g/mol Compound name is hydrogen fluoride Convert between HF weight and moles The HF molecules, with a short H–F bond of 95 pm, are linked to neighboring molecules by intermolecular H–F distances of 155 pm. [17], Upon contact with moisture, including tissue, hydrogen fluoride immediately converts to hydrofluoric acid, which is highly corrosive and toxic. Name: Hafnium ['hæfniəm] Formula: Hf. Molar mass is the mass of 1 mole of the solute. weight percentage. Did you mean to find the molecular weight of one of these similar formulas? 4 years ago. mol −1: Appearance colourless gas or colourless liquid (below 19.5 °C) Density: 1.15 g/L, gas (25 °C) 0.99 g/mL, liquid (19.5 °C) 1.663 g/mL, solid (–125 °C) Melting point −83.6 °C (−118.5 °F; 189.6 K) Boiling point: 19.5 °C (67.1 °F; 292.6 K) Solubility in water. Atomic No: 72. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). Pyrolysis of chlorodifluoromethane (at 550-750 °C) yields TFE. Hf. However concentrated solutions are strong acids, because bifluoride anions are predominant, instead of ion pairs. Chloroform is fluorinated by HF to produce chlorodifluoromethane (R-22):[14]. density = 1. Hafnium is a silvery metal at room temperature. It is commonly used to etch glass and silicon wafers. 1 decade ago. molar to mass. Calculate the molecular weight So, in this problem we already know the total mass = 125.0 g. If we can find the mass of HF, we can then easily solve for mass percent. Its main uses, on a tonnage basis, are as a precursor to organofluorine compounds and a precursor to cryolite for the electrolysis of aluminium. Several kilograms of HF are consumed per ton of Al produced. To complete this calculation, you have to know what substance you are trying to convert. Breathing in hydrogen fluoride at high levels or in combination with skin contact can cause death from an irregular heartbeat or from fluid buildup in the lungs. In this approach, HF is oxidized in the presence of a hydrocarbon and the fluorine replaces C–H bonds with C–F bonds. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. You can sign in … Give us feedback about your experience with Molecular Weight Calculator. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass. 5. molar to mass. Greenwood and Earnshaw, "Chemistry of the Elements", pp. Reflecting the ability of HF to participate in hydrogen bonding, even proteins and carbohydrates dissolve in HF and can be recovered from it.