Mole

divided by 3 moles of NaOH which is related to 1 mole of Acid, because they have a 3:1 relationship respectively. Finally, we divided by the militers of soda used, which was 25. This resulted in a molarity of .007M. For Trial 2, the process is the same except we multiply by 5.2ml of NaOH used instead of 5.3ml. These calculations still produce a molarity of .007M. This means that the average molarity of citric acid in the sample is .007M. We use this determined molarity to find the moles of…

D. Mole 3. The first step in every Stoichiometry Problems is to? A. Balance the equation C. Solve the mass of the element/compound B. Determine the Limiting Reagent D. Determine the Excess Reagent 4. Stomach acid is made up of hydrochloric acid (HCl). How many percent by mass does hydrogen take up in the compound? A. 27% C. 1.6% B. 2.8% D. 2.0% 5. A piece of marble contains 8.74 x 1025 formula units of calcium carbonate (CaCO3). How many moles does it contain…

Analysis of aspirin tablets Purpose: Determine the percentage of 2-ethanoylhydroxybenzoic acid in aspirin tablets. Introduction (including background information) : Before creating Aspirin, “sail alba” was used. In 1860’s, chemists discovered that Salicylic acid (2-hydroxybenzoic acid, C7H6O3 ) is the active acid in sail alba. Salicylic acid is relatively strong though. It can irritate and damage the stomach membranes and mouth. In 1889, ethanoate ester of salicylic acid was introduced by the…

people have moles. Sometimes they are born with them, and other times they develop them. Moles can be beautiful, depending on how big and where they are positioned. Most of the time, they are harmless. However, sometimes they can start off harmless and progress into cancerous lesions. This paper will focus on the number one tool for patients to recognize melanomas, and that is teaching. Teaching patients how to monitor and look for certain characteristics between melanomas and moles can help…

developing. How Do I Know If My Skin Growths Are Cancer? How Do I Tell the Difference Between Harmless and Harmful Skin Growths? Inset: Moles can darken harmlessly during puberty and pregnancy. Inset: Keloids are excessive scar tissue growths over healed wounds. Captions: Layers of skin A normal wart Seborrheic Keratosis Skin tags Cherry Angioma Tea Tree Oil Normal mole Melanoma Lentigines Dermatofibroma ABCDE Chart Cutaneous horn Plantar Warts Actinic Keratoses Your skin is the largest…

transferred. In addition, the measurements of how much liquid was poured into the beaker may be off. Post Lab Questions 1. The moles of CaCO3 is 0.01828 because the mass of CaCO3 is 1.830 grams, therefore in order to get the moles of CaCO3, we must divide 1.830 by the molar mass of CaCO3, which is 100.1. This yields 0.01828 moles. 2. Dividing the mass of the unknown carbonate by the moles of CaCO3 will yield the molar mass of M2CO3. Therefore, 1.931 /0.01828 is 105.6 grams per…

heat is 0.387 J/g℃. The percent error of that calculation is 32.299%. A considerable reason for this error is inaccurately reading the thermometer to the tenth degree digit (0.1℃). The atomic mass of Copper calculated is 95.038g/mole while the actual atomic mass is 63.548g/mole yielding a percent error of 49.553%. The error calculated can still be attributed to inaccurately reading the thermometer when gathering data. The final calculation made was using the entire class data and plotting it on…

substance Mole: the amount of a substance contained in 6.02 x 10²³ particles of that substance Percent composition: the percent by mass of each element present in a compound Empirical formula: a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms Molecular formula: a formula giving the number of atoms…

model developed in this research to compare the equilibrium and experimental mole fraction of the product gases obtained from different bed materials. Figure 5 illustrates the evolution of the experimental mole fraction of the product gases for various bed materials. Also, a horizontal line indicates equilibrium mole fractions estimated by the thermodynamic model. It must be pointed out that the estimated equilibrium mole fractions of the product gases are expressed on a dry basis to be able to…

identifying warning signs. The A stands for asymmetrical. When a mole is benign, when your draw a line in the middle it will be symmetrical. But, if the mole is malignant it will be asymmetrical, and this can be a warning sign for melanoma. The B stands for border. A malignant mole's borders tend to be uneven and the edges may be notched (in the shape of a V). This can also be warning sign for early melanoma. C stands for color. If a mole is one shade (usually brown) it is benign, but if it has…