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Molar Relationships Lab Report

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Molar Relationships: What Are the Identities of the Unknown Compounds? The purpose of the experiment was to identify unknown compounds using knowledge on the concept of mole. The guiding question for this experiment is what are the identities of the unknown compounds? The numbers of moles and the identities of the compounds are the only given. To be able to identify the compounds the mass, molar mass and the number of moles will be needed. Molar mass is the quantity in grams of one mole of a substance. The molar mass is found by adding the number of grams of each element to find the total amount of grams per mole. For example CaH2 has the elements of Calcium which has the molar mass of (40.078g/mole) and two Hydrogen which is (2 x 1.0079 g/mol).When the mass of both elements are added the molar mass of CaH2 is 42.0938g/mol.Moles are really important because it allows chemist to be able to have a standardize meausment which gives them the chance to compare compounds. …show more content…

To calculate the experimental mass the substance of each bag and the bag its self was measured using a balance. After gathering the mass subtract the mass of the empty bag to the mass of the unknown substance, in order to just have the mass of the substance. Afterward the mass of the unknown substance was divided by the number of moles recorded on the bag of the substance. The measurements are displayed on the table

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Which was 117.60 grams for substance 1, 87.71 grams for substance 2, 54.7 grams for substance 3, 25.11 grams for substance 4. Once we finished weighing each unknown substance we started figuring out the g/mol mass of each compound that the substances could possibly be, which is how we got to Table #2 above. In order to find the g/mol mass of each of the compounds, we had to find the molar mass of each element, then multiply and add accordingly. I'll use K2SO4 as an example of how to calculate the molar mass of a compound. The elements in K2SO4 are Potassium, Sulfur, and Oxygen.

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AP Chemistry Semester 1 Final Review 2016 Basics of Chemistry: Name the following compounds BO3 H2S NaOH OF8 PCl6 HNO3 HgNO2 Write the formula for each compound Pentaboron triselenide Sulfuric Acid Carbon Monoxide Lithium Chloride How many moles are in 58.6 g of AgNO3 How many grams are in 2.5 moles of Cl2

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To begin with, is the experimental process used to determine the identity of the rock. In doing so one will need to discover the density of the rock. By measuring the rock sample with grams per milliliter is a way used to figure out the density. In starting one will need to measure the mass of the rock using grams. Then using a set milliliter amount of a liquid substance, such as water, one will place the rock sample inside.

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To begin this, experiment our group start to weigh three difference empty test tube to get their mass before we put any unknown salt in so we don’t make a calculated mistake. Zeroing the balance with the beaker inside, we put the test tube in the beaker to calculate the unknown hydrate mass.

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The method of messuring, after deviding the rest of beans in the plates, we measured the weight of each plate of the mug, black, and coffee beans. we had a total of two plates each for the beans mug, black, and coffee beans. for the mug bean plate one the total

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A mole is a unit of measurement that follows the rule of ; 1.00 mole = molar mass = 6.02 x 10^23 atoms/ ions/ molecules / formula units = 22.4 L of any gas at standard temperature and pressure. That formula was used to determine the mass of the anhydrated substance. A anhydrate is a substance with water heated out of it. The purpose of this lab was to determine how many moles of water are

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1080 Words | 5 Pages

Measure out 0.035 - 0.045g of magnesium ribbon and tie a string to it and record the mass of the ribbon. Pour 6 mL of HCl into the eudiometer. Carefully pour 50-60 mL of distilled water to fill up the rest of the eudiometer.

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That is where stoichiometry comes along, which is the quantitative relationships or ratios between two or more substances undergoing a physical or chemical change in a balanced equation. It identifies the mole ratio between reactants and products. To understand stoichiometry you have to understand the products and reactants, which involves how to solve balanced reactions. This allows chemists to determine how many moles of a product will be produced from a specific number of moles of a recant or how many moles of reactant are needed to produce a specific amount of a product.

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Which of the following unit is used to indicate mass? a. Cm3 b. Um c. Mg d. mL 21. Which of the following demonstrate a chemical reaction of water?

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Determining the Molar Volume of a Gas Lab Report The purpose of the experiment is to determine the molar volume of hydrogen gas at standard pressure and temperature. Excess hydrochloric acid was placed in a eudiometer and decanted with deionized water. A piece of magnesium ribbon was trapped in a copper wire cage in the eudiometer in order to keep it in place as the more dense hydrochloric acid diffused downward in the inverted eudiometer.

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In this experiment, the mass of the object is the independent variable. Mass is how much material an object has. (Singh, Lakhmir, 2012) It is the only variable that will be changed throughout the experiment. The dependent variable is what one observes or measures.

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Each group was assigned a different percent of sucrose solution out of the four variables; 0% , 5%, 10%, and 15%. After we filled the beaker we then got two potato cores. Once we had the cores we cut the skin off the ends. Following this we then cut the two potato cores into four 2.00 cm potato cores. After they were cut into 2.00 cm each we found the mass.

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The object was dried with a paper towel to avoid any water droplets and the mass balance was checked to read 0.0 g when nothing was on it. The first measurement that was retrieved as the mass of the metal object was 24.15 g. This was repeated for a second measurement of 23.85 g, and a final measurement of 23.82 g. All three mass measurements were recorded. Moving forward, to find the volume of the metal object, the graduated cylinder

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In this lab when looking at cells, we observed the salinity and osmolarity of the cell when placed in the environment. With the different concentrations of NaCl, we are able to see how different environment can constrain an organism and see the wide range of responses to regulate in cell’s osmolarity. The cells we studied was sheep red blood cells (erythrocyte), because they are the most studied membrane system and therefore used as ideal membrane to study the relationship between water and the passing of the different concentration of NaCl across the membrane. The purpose of the experiment was to observe the cell and infer which direction of the flow of the water due to the cell volume change.

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M_2)/ρ_2 ) (2) Where, the quantity Vm, V1, V2 relates to the molar volumes of mixture, component 1 and component 2, respectively. x1, x2 & M1, M2 are mole fraction and molar masses of component

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