Law Of Conservation Of Mass
Law Of Conservation Of Mass - Related Videos
13:35
Mass Conservation and Flow Rate Measurements
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2023
Source: Ricardo Mejia-Alvarez and Hussam Hikmat Jabbar, Department of Mechanical Engineering, Michigan State University, East Lansing, MI The purpose of this experiment is to demonstrate the calibration of a flow passage as a flowmeter using a control volume (CV) formulation [1, 2]. The CV analysis focuses on the macroscopic effect of flow on engineering systems, rather than the detailed description that could be achieved with a detailed differential analysis. These two techniques should be...
09:46
Conservation of Momentum
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2023
Source: Nicholas Timmons, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA The goal of this experiment is to test the concept of the conservation of momentum. By setting up a surface with very little friction, collisions between moving objects can be studied, including their initial and final momenta. The conservation of momentum is one of the most important laws in physics. When something is conserved in physics, the...
02:31
Scientific Laws and Theories
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2020
Scientific Laws In science, a law is defined as a concise, verbal or mathematical, statement that summarizes a vast number of experimental observations. It describes or predicts some facets of the natural world that always remain the same under the same conditions. Scientific Theory A scientific theory is a unifying principle that provides a well-substantiated and testable explanation of aspects of nature and provides the reason for why things happen. Well-established theories are the...
04:06
Ideal Gas Law - Concepts
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2020
Derivation of the Ideal Gas Law Gases are a fundamental state of matter. A gas is a collection of molecules that have a significant distance between their molecules. Due to this distance, colorless gases are invisible to the human eye and are studied using four measurable parameters: pressure (P), volume (V), number of moles (n), and temperature (T). The ideal gas law is a mathematical equation that relates all of these parameters. It is a combination of several different laws that describe the...
03:43
Applications of the Ideal Gas Law: Molar Mass, Density, and Volume
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2020
The volume occupied by one mole of a substance is its molar volume. The ideal gas law, PV = nRT, suggests that the volume of a given quantity of gas and the number of moles in a given volume of gas vary with changes in pressure and temperature. At standard temperature and pressure, or STP (273.15 K and 1 atm), one mole of an ideal gas (regardless of its identity) has a volume of about 22.4 L — this is referred to as the standard molar volume. For example, one mole each of hydrogen, oxygen,...
FAQs
Balancing a chemical equation requires changing coefficients, not the subscripts within chemical formulas. Coefficients adjust how many particles or moles participate, while subscripts describe the fixed atom composition of each substance. This preserves the identity and number of atoms represented by every formula, allowing the equation to support valid stoichiometric calculations without changing the reaction itself.
During a reaction, conservation is tracked through atom inventories rather than through unchanged molecules. Reactant bonds can break and product bonds can form, so substances and their properties may change even though each element retains the same number of atoms. This distinction lets chemists describe chemical transformation while maintaining the accounting needed to balance equations.
A closed system is important because the mass comparison includes the material participating in the reaction and the products formed. If the system does not retain all relevant material, the measured mass may not represent the complete reaction inventory. Defining the system boundary therefore makes conservation a usable basis for interpreting experimental mass measurements.
Once an equation is balanced, its coefficients provide the ratios used to compare available reactants. The limiting reactant is identified by determining which reactant amount restricts the product that can form. This application connects atom-level conservation with a practical prediction: the calculated product amount cannot exceed what the limiting reactant permits.
To apply the law in a chemistry problem, first write the correct formulas for the reactants and products, then count atoms of each element on both sides. Adjust coefficients until every elemental count matches, and use the balanced relationship for stoichiometric calculations. Checking the final atom totals helps detect an incorrect equation before quantities are calculated.
Laboratory and industrial reaction analysis uses conserved mass relationships to compare expected and obtained product amounts. Stoichiometric calculations predict how much product should form from the available reactants, while reaction-yield analysis compares that prediction with the amount actually produced. The difference provides a quantitative way to evaluate process performance without abandoning the balanced chemical relationship.