How many grams of NaCl are in 225 mL of a 0.75 M NaCl solution? (The molecular weight of NaCl is 58.44 g.) ChemistrySolutionsMolarity
2.228 × 10^"23" molecules. 1 mole contains 6.022140857 × 10^"23" (Avogadro's number) The molecular weight of N_2O_3 is: 76.01 g/mol You have 28.3 g, so you have 28.3 / 76.01 = 0.37 mole Hence you have 0.37 × 6.022140857 × 10^"23" = 2.228 × 10^"23" You have 2.228 × 10^"23" molecules.
Convert to grams per liter, and then use molecular weight of the compound to convert to moles per liter.
The molecular weight of anhydrous sodium carbonate is 106 and the molecular weight of water is 18. Therefore, the formula for the molecular weight of N a2CO3XH 2O is 106 + 18X. Thus, by definition, one mole of N a2CO3XH 2O will have a mass of 106 + 18X.
Molarity = Moles/L Mole = Gram-molecular weight/grams (mass) Assuming water solutions (also should be stated, along with the temperature) at 20'C one Liter of water is 1000grams. Molality is moles/1000g, which is the same as molarity for the conditions specified.
2.7g water Okay, so first we need to calculate the number of mols in the HCl that reacts. number of mols = "mass in (g)"/"Molecular Weight (g per mol)" = 10.8/36.5 = 0.295mols Notice the ratio of HCl to Water in the reaction. Two mols of HCl react but only one mol of H_2O is produced. Therefore if we start with 2mols of HCl, we get 1mol of H_2O, so in this case we need to halve the number of ...
The tequired mass of sulfur is 25"g". We have a very simple chemical reaction equation: "S"+"O"_2\rightarrow "SO"_2 This the ratio of reactant to product is one mole of sulfur to one mole of sulfur dioxide. But next we have to find the total number of moles corresponding to 50"g" of sulfur dioxide. To do that add p the atomic weights to get the molecular weight: ((32"g S")/"mol")+2×((16"g O ...