Molar

mass of an atom of a chemical element expressed in atomic mass units; approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes Molar mass: a physical property defined as the mass of a given substance (chemical element or chemical compound) divided by the amount of substance Mole: the amount of a substance contained in 6.02 x 10²³ particles of that substance Percent composition:…

The molar heat of vaporization of n-heptane for the rising T and falling T sets of data was 26.10 kJ/mol . This is the energy required to transform a given amount of n-heptane from a liquid into a gas at a certain pressure. In both table 1 and 2, the vapor pressure was gradually increased as the temperature increased. Also, the vapor pressure was decreased as the temperature decreased. This means that the data values that obtained from this experiment were true values. The isoteniscope method…

contents of the metal in the one test-tube to the calorimeter, stir, and immediately take the temperature of the water in the calorimeter. Discussion Questions: Part 1 1. Calculate the percent error in your determination of the value for the molar heat of fusion of ice. The accepted value for the heat of fusion of ice is 6.01 kJ/mol. The percent error formula to be used is as follows: Percent error = theoretical value - experimental value x 100 theoretical value The percent…

Pectin yield was determined as weight of dry pectin against the weight of initial residues multiplied by 100%. Y=100(P/Bi) Where Y is the extracted pectin yield (%), P is the amount of extracted pectin in grams and Bi is the initial amount of sweet potato residues used to extract pectin. Equivalent weight and Degree of methoxylation The equivalent weight was determined according to the method by Barretina et al., (Barretina et al. 2012). 0.25g pectin was wetted with 5ml ethanol and topped…

Research Question: How do different concentrations of nitric acid (measured in molars) with copper powder (grams) affect the rate of reaction (measured in seconds) measured using a stopwatch? Hypothesis: The copper powder placed in the most concentrated amount of nitric acid, measured in molar, will take the least amount of time, measured in seconds, to react compared to the amounts of copper powder in other less concentrated amounts of nitric acid. This is as if the concentration of nitric acid…

Introduction Section- The purpose of this experiment is to use reaction stoichiometry to determine the molar mass and the identity of an unknown, powdered metal, and to identify an unknown metal nitrate solution. To give a little background information on this experiment I will start by saying that a balanced chemical equation provides several important pieces of information about a chemical equation. Those important pieces include the substances consumed and formed, the physical states of the…

to celebrate the sixth birthday, be ready to hear your excited kid tell you about a moving tooth. 4. When Do The Molars First Appear? The molars are the wider teeth that are located at the back of the mouth. The first set of molars will appear anytime between the ages of 13 and 19 months. They will first erupt on the top gum, to be followed by the pair at the bottom gum. The molar teeth on your kid’s lower gum will appear sometime between the ages of 14 and 18 months. 5. Do Kids Lose All…

locate the position of the foramen in relation to the maxillary molars in dry human skulls in Indian population.This study also examined the greater palatines foramen and its distance from the mid palatine suture. AIM To measure the variation in location of greater palatine foramen in dry human skulls. MATERIALS & METHODOLOGY A total of 61 adult dry human skulls were selected. With full complement of teeth with fully erupted 3rd molars. • Measurements were made from the mid sagital plane to…

(2). The recipient site is either immediate extracted tooth socket or a surgically prepared alveolus. When there is an available donor tooth, ATT is a viable treatment option for replacement of a traumatized tooth (3). According to Mejare B et al, Molar tooth loss may have different etiologies (ie) grossly decayed, failed root canal treatment, unaffordable patients and tooth fracture/ perforation (4). Tanaka T et al concluded that ATT is an appropriate alternative to the usual prosthetic…

The lingual nerve can be closely associated with the crown of the impacted third molar and may lie above the level of the lingual bone before passing downwards and forwards into the floor of the mouth and the tongue. Nerve repair When the inferior dental nerve or lingual nerve are damaged and sensation is lost or dysaesthesia (unpleasant sensation) occurs, nerve repair should be considered.This is best undertaken by an experienced operator using a microscope and fine sutures (10/0…