Chemistry

Atoms and Atomic Structure

Molecular Mass

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This depends on the concentration of sodium chloride in water.

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0Molarity = moles of solute/Liters of solution5 M MgSO4 = moles MgSO4/1 L5 moles MgSO4=============since all is one to one in ion countMg 2+ = 5 moles--------------------------andSO4 2- = 5 moles----------------------

50 mM NaOH solution means that there are .050 moles of NaOH for each liter or solution. Likewise for 5 M meaning 5 moles per liter. So, 5 moles/liter * 1 liter = 5 moles. So you have 5 total moles of NaOH. You want to use that to make a 50 mM solution. In order to dilute 5 moles/liter down to .050 moles/liter, you have to add water. For example, if you only want 1 liter of the final .050 M solution, then you only need .050 moles of NaOH. So you take the 5M solution and find out how much contains .050 moles of NaOH. 5 moles/liter * x liters = .050 Moles .050 Moles / 5 moles/liter = .01 liters. So .01 Liters, or 10 milliliters of the 5 M solution, combined with 990 milliliters of water makes 1 liter of .050 M solution.

Molarity is moles in every litre. Therefore you have to convert this to find out the moles in each litre. 21/52 is 0.404 molar.

250 mL is 0.250 liter. By definition, each liter of a 5.00 M solution contains 5 moles of sodium hydroxide, and each mole of sodium hydroxide contains one mole each of sodium and of hydroxide ions. Therefore, the specified volume of the specified solution contains 0.250(5.00) or 1.25 moles of hydroxide ions, to the justified number of significant digits.

By the definition of molarity, which is mass of solute in moles divided by solution volume in liters, 250 ml of 0.15 M NaCl* solution requires (250/1000)(0.15) or 0.0375 moles of NaCl. Each liter of 2M NaCl solution contains 2 moles of NaCl. Therefore, an amount of 0.0375 moles of NaCl is contained in (0.0375/2) liters, or about 18.75 ml of the 2M NaCl, and if this volume of the more concentrated solution is diluted to a total volume of 250 ml, a 0.15 M solution will be obtained. _________________ *Note correct capitalization of the formula.

The molarity of a solution is the amount of substance in a given amount of solute. The units are usually given as moles per liter (or dm3). As such, for each liter you have 0.5 moles of substance (2 divided by 4), so it's a 0.5 molar solution.

In order to understand what an isotonic solution is used for you must first understand each word. The word "isotonic" simply means "of equal tension". The word "solution" means "a mixture of two or more substances". Therefore and isotonic solution is a balanced mixture. The most common isotonic solution is a saline solution.

It depends on which Saline County you want. There are five Saline Counties across the US in different states. The county seats for each Saline County is as follows: * Saline County, Arkansas: Benton * Saline County, Illinois: Harrisburg * Saline County, Kansas: Salina * Saline County, Missouri: Marshall * Saline County, Nebraska: Wilber

The same number of moles for each.

The melting point of water is lowered by 1.85 degrees Celsius if 29.2 grams of salt are dissolved in each Kg of water (called a "0.5 molal solution" of salt). So normal saline, a 0.9 molal solution), is lowered juts less thantwice this or 3.33 deg C. So normal saline freezes at -3.33 deg C or 26 deg F.

There are 73.5 moles of P4O10 per kg of solution. Each P4O10 molecule weighs approximately 283.88 g. P makes up 123.88 or about 77.43% of this. 73.5 moles of P4O10 weighs about 20865.18 g. 77.43% of 20865.18g is 16155.91 g. Multiply this by the inverse of the molar mass of P (30.97g /mol) and your answer should be approximately 521.66 moles of P.

The first solution is more concentrated because it contains 6 moles of H2SO4 per one liter of solution. The second solution is less concentrated because it contains 0.1 moles of H2SO4 in one liter. In equal amounts of each example, the first would have more H2SO4.

A neutral solution can contain ions of hydrogen, hydroxide, and the cation and anion of any neutral salt. There are equal numbers of hydrogen and hydroxide ions, and also an equal (but usually different) number of the other pair of ions.

Avogadro's number of 6.02x10^23 is the quantity of particles in one mole of any given. Similarly for each mole of water, or H20 there are 2 moles of hydrogen atoms. 6 moles of water thus contains 12 moles of hydrogen. Multiplying 12 by Avogadro's number yields the solution of 7.2x10^24 moles of hydrogen.

Since the formula shows two sodium atoms in each formula unit of sodium sulfate and this compound normally completely ionizes in water solution, the number of sodium ions will be twice the number of moles of the salt; in this instance, 1.0 moles of sodium ions.

molarity (M) is the concentration of moles (n) of a solute per liters (v) of solution M=n/v

2 moles 80/40= 2

Your question is a little ambiguous. However, in general, there is normality, molality and molarity which each describe the concentration of a solute into a solvent. The fraction of moles of solute to solvent could correctly be termed the "molar fraction" or, "molal fraction" depending on whether the solvent is expressed in volume or weight respectively. By contrast, normality is based on the chemical functionality of the solute, for example a 1M solution of sulfuric acid would be about a 2N solution of acid.

1.5 moles of N2O5 Each molecule of NO3 contains one atom of nitrogen, so 3 moles of the compound will contain 3 moles of N atoms. However, N2O5 molecules each contain two nitrogen atoms, so each mole of N2O5 has two moles of nitrogen. So, in order to have three moles of N atoms, you need only 3/2 = 1.5 moles of N2O5.

Every cell in the body operates on the requirement of a specific saline content. Despite the fact that animals have been on land for hundreds of millions of years, each cell must be bathed in saline solution nearly the same as that found in the oceans.

In each mole of ethanol there are two moles of carbon atoms. One mole of carbon atoms is required to form one mole of carbon dioxide, so two moles will form two moles. Thus each mole of ethanol completely combusted will form two moles of carbon dioxide.

The chemical equation for the decomposition of H2O2 is 2 H2O2 -> 2 H2O + O2. This shows that two moles of H2O2 are required to produce each mole of O2. By definition, a 0.500 M solution of H2O2 contains 0.500 moles of H2O2 in each liter of solution. Solutions are always homogeneous; therefore, 50,0 mL of such a solution will contain (0.500)(50.0/1000) or 0.0250 moles of H2O2. As noted in the first paragraph, this will produce half as many, or 0.0125, moles of O2. The gram molar mass of O2 is twice the gram atomic mass of oxygen, or 31.9988. Therefore, decomposition of this amount of H2O2 will produce 31.9988 X 0.0125 or 0.400 gram of O2, to the justified number of significant digits.

1 mole of carbon and 4 moles of hydrogen

The number of units indicated by each description of moles of atoms and moles of molecules is the same and is specifically Avogadro's Number, about 6.022 X 10^23

Boron trifluoride is BF3. So each mole of BF3 contains 1 moles of boron (B) and 3 moles of fluorine (F). Thus, 3 moles of BF3 contains NINE moles of fluorine.

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