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Answered 2011-03-10 01:50:33

Molality moles/kg

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How many kilograms of solvent are in a sample of 0.30 molal solution if the sample contains 13 moles of solute?

molarity = moles of solute/ kilogram of solvent 0.30=13/x 0.30x=13 x=13/0.30 x=4.333333333333333333


What is it meant by the concentration of a solution?

In general the amount of a solute (the smaller component) in a solvent (the larger component). The higher the concentration the more solute relative to solvent. This can be expressed many ways such as molarity (moles per liter), molalitity (moles per kilogram of solvent), weight percent, volume percent, etc.


Amount of a solute that can be dissolved in a solvent?

The amount of solute that can be dissolved in a solvent has many factors. These include: the strength of the solvent, the temperature of the solvent, whether the solute is soluble or not. There is no definite answer to the question.


How do you solve freezing point depression problems?

To solve freezing point depression problems, you need to know the following things:-- the identity of the solute (the thing you are adding to the liquid)-- the identity of the solvent (the liquid)-- whether the solute is molecular or ionic, and if ionic, how many ions it forms-- the amount of solute (in grams or moles)-- the amount of solvent (in kilograms)-- the value of Kf of the solvent (for water, it is -1.858 K·kg/mol (or -1.858 °C molal-1)Then you use the following equation:∆T = i * Kf * mwhere ∆T is the change in the freezing point, "i" is the number of molecules or ions formed upon addition to the solvent, Kf is the freezing point depression constant, and "m" is the molality of the solution.The Kf of water for a freezing point depression is known and is equal to -1.858 °C·kg/mol (or -1.858 °C molal-1)The value of "i" has to do with what you add to the water. If you added sugar, a molecular compound the value of "i" is 1.0. If you add a ionic compound like NaCl, the value of "i" is 2.0 because for every 1 molecule of NaCl, you make 2 ions: one Na+ and one Cl- in water. For MgCl2, the value of "i" is thus 3.0 (for each MgCl2 you get one Mg2+ and two Cl- ions, so a total of 3 ions).To find "m," the molality of a solution you need to know the number of moles of solute and the number of kilograms of solvent (m = moles/kg). If you are given the number of grams of solute, the number of moles is found from the mass and the molar mass of the solute.grams of solute ÷ molar mass of solute = moles of soluteTo find the molality, just divide the moles of solute by the kilograms of solvent moles of solute ÷ kilograms solvent = molality Note: If you are given the volume of the solvent instead of the mass, use the density of the solvent to convert -- the density of water is 1 kilogram per liter)Liters of solvent * density of solvent = kilograms of solventNow just plug all the numbers into the equation at the top of the answer!


How many moles of solute are there 2L of a 10M solution?

Molarity = moles of solute/volume of solution( In liters, in this case) 10 M whatever = moles of solute/2 Liters = 20 moles of whatever


Is water called the universal solute because it dissolves many substances?

no. water is the universal solvent not a solute, a solute is something that dissolves in a solvent.


How do you find how many moles are in a solute?

Yoy need to know the molar mass of this solute and the mass of the solute:moles = total mass/molar mass


How do you calculate the molality of a solution?

To solve boiling point elevation problems, you need to know the following things:-- the identity of the solute (the thing you are adding to the liquid)-- the identity of the solvent (the liquid)-- whether the solute is molecular or ionic, and if ionic, how many ions it forms-- the amount of solute (in grams or moles)-- the amount of solvent (in kilograms)-- the value of Kf of the solvent (for water, it is 0.52 K·kg/mol (or 0.52 °C molal-1)Then you use the following equation:∆T = i * Kf * mwhere ∆T is the change in the freezing point, "i" is the number of molecules or ions formed upon addition to the solvent, Kf is the freezing point depression constant, and "m" is the molality of the solution.The Kf of water for a boiling point elevation is known and is equal to 0.52 °C·kg/mol (or 0.52 °C molal-1). Notice it is positive -- for freezing point depression problems, the value of Kf is negative.The value of "i" has to do with what you add to the water. If you added sugar, a molecular compound the value of "i" is 1.0. If you add a ionic compound like NaCl, the value of "i" is 2.0 because for every 1 molecule of NaCl, you make 2 ions: one Na+ and one Cl- in water. For MgCl2, the value of "i" is thus 3.0 (for each MgCl2 you get one Mg2+ and two Cl- ions, so a total of 3 ions).To find "m," the molality of a solution you need to know the number of moles of solute and the number of kilograms of solvent (m = moles/kg). If you are given the number of grams of solute, the number of moles is found from the mass and the molar mass of the solute.grams of solute ÷ molar mass of solute = moles of soluteTo find the molality, just divide the moles of solute by the kilograms of solvent moles of solute ÷ kilograms solvent = molality Note: If you are given the volume of the solvent instead of the mass, use the density of the solvent to convert -- the density of water is 1 kilogram per liter)Liters of solvent * density of solvent = kilograms of solventNow just plug all the numbers into the equation at the top of the answer!See the Web Links and Related Questions for more information!


How is the percent concentration of a solution calculated?

Percent concentration could mean many things...MOLARITY is defined as the moles of solute per unit volume of solution so 5 moles of NaCl in one liter of solution would be 5M (molar) NaCl solution.(Note: Solution is the solvent and solute combined, usually the solid is added and then the solution is filled to a certain line once the solid has dissolved.)MOLALITY is defined as the moles of solute per kilogram of solvent (NOT solution). So 5 moles of NaCl in one kilogram of water makes 5 mol/kg NaCl. (sometimes the symbol m is used for molality but is often confused with the unit of meters).For other types of "percent concentration" of solutions check:http://en.wikipedia.org/wiki/ConcentrationA cursory glance seemed to confirm the accuracy of the information.


How many number of moles of solute in 2.50 x 102 ml of 0.250M HCl?

Molarity = moles of solute/volume of solution.


What is the difference between the solvent and the solute that make up a solution?

The solute is what is being dissolved. The solvent is what the solute is dissolved in. Take coffee for example. The solute would be the coffee, and the water would be the solvent. In fact, water is able to dissolve so many substances that it's called the universal solvent.


What is solute and solvent are at home like any liquid its solute and the solvent soy sauce?

The solvent in the soy sauce is water; the sauce contain many components, after a specific recipe.


What is the solute and solvent of seawater?

The solvent is water; the solutes are many dissolved salts as chlorides.


How many moles of solute are contained in 200 milliliters of a 1M solution?

0.2 moles


What are the solute and solvent in a marshmallow?

The syrup can be considered as a solvent for the other ingredients.


How many moles of Na2CO3 are there in 10.0 L of 2.0 M soluton?

Molarity = moles of solute/Liters of solution Or, for our purposes, Moles of solute = Liters of solution * Molarity Moles Na2CO3 = 10.0 Liters * 2.0 M = 20 moles Na2CO3 --------------------------


Many laboratory preparations of solutions call for stirring the solvent while adding the solute. What is an effect of this procedure?

It brings the solute and solvent rapidly into contact.


How many equivalents are there in 15 ml of concentrated Hcl which is approximately 12 molar in concentration?

molarity = number of moles of solute / volume of solution number of moles of solute = molarity x volume of solution number of moles of solute = 12 (mole/L) x 15/1000 (L) number of moles of solute = 0.18 mole


How many moles of solute are contained in 200 milliliters of 1 M solution?

0.2 mole of solute


Solute and solvent of hair shampoo?

most likely water because water is the solvent for many solutions.


What is solute and solvent of the soy sauce?

The solvent is water; sauces contain many different solutes, after the recipe.


What is the measurement for dissolved solids in a liquid?

Usually the amount of solute in a solvent is measured by concentration, that is, how many grams of the solute is in one liter of solvent. This is called molarity or M.


How many moles of solute are contained in a 250.0 mL solution with a concentation of 2.5 M?

The answer is 0,625 moles.


How many moles of a solute are present in a 12.0 L 3.00 M HCL?

The answer is 36 moles HCl.


How many moles of HCl is present in 10 ml of the 0.1 M solution?

Molarity = moles of solute/liters of solution or, for our specific purpose here moles of solute (HCl) = liters of solution * Molarity 10 ml = 0.01 liters moles of solute (HCl) = (0.01 liters)*(0.1 M HCl) = 0.001 moles of HCl ------------------------------


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