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It depends on the substance whose volume you know. > If you have a pure liquid or a solid, you use its density to calculate its mass and then divide the mass by the molar mass. If you have a solution, you multiply the molarity by the volume in litres. MOLES FROM VOLUME OF PURE LIQUID OR SOLID There are two steps: Multiply the volume by the density to get the mass. Divide the mass by the molar ...
Answer link. "0.910 moles Na"^ (+) You're dealing with a soluble ionic compound, so you know for a fact that it dissociates completely in aqueous solution to produce cations, which are positively charged ions, and anions, which are negatively charged ions. In this case, you know that one formula unit of sodium chloride, "NaCl", contains one ...
To find the number of moles of Na2SO4 in 25.0 g of the compound, you need to convert the mass to moles. First, determine the molar mass of Na2SO4, then divide the given mass by the molar mass to ...
Solution: n = 0.300L soln × 0.400 mol NaCl 1L soln = 0.120 mol NaCl. You multiply the molarity by the volume in litres. > Molarity is the number of moles of a substance in one litre of solution. The official symbol for molarity is “c” (concentration), but many people use the old symbol “M”. M = n/V, where n is the number of moles and V ...
The official symbol for molarity is “c” (concentration), but most people use the symbol “M”. M = n V, where n is the number of moles and V is the volume in litres. We can rearrange this equation to get the number of moles: n = M × V. How many moles of NaCl are contained in 0.300 L of 0.400 mol/L NaCl solution? You multiply the ...
Explanation: Determine the mass of the substance, and its molar mass. Divide the given mass by its molar mass to get moles, then multiply times 6.022 × 1023molecules 1mol. Example. How many molecules are contained in 25.00 g glucose (C6H12O6)?
Solution. Step 1: Convert all masses into moles. 1.20g Al × 1 mol Al 26.98g Al = 0.044 48 mol Al. 2.40g I₂ × 1 mol I2 253.8g I₂ = 0.009 456 mol I2. Step 2: Calculate the molar ratios. To calculate the molar ratios, you put the moles of one reactant over the moles of the other reactant.
Here is a video on converting moles of a compound to atoms. Answer link. Related questions.
Multiply the number of moles of the substance by its molar mass in grams/mole (g/mol). The molar mass of calcium chloride is determined by multiplying the subscript for each element by its molar mass (atomic weight in g/mol), and adding the results. You can also look up the molar mass. Molar masses. Ca:(1 ×40.078 g/mol) = 40.078 g/mol.
So 1 mole of NaCl weighs 58.5g. So now we need to convert grams into moles by dividing mass in grams by the mass of 1 mole. So the number of moles of NaCl = 58.5/58.5 = 1 mole So the concentration of NaCl is 1 mol.dm^ (-3) This means that in 1dm^3 of solution there must be 1 mole of sodium ions. The number of particles in 1 mole is given by the ...