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How many moles are in 45 grams of potassium oxide?
45/94.2 is 0.4777 moles
How many atoms in 26 gr of sodium chloride?
We just use stoichiometry. The molecular formula for sodium chloride is NaCl. First we must find the molar mass of NaCl, using the molar masses of each element in the compound. So, 23 g/mol of Na + 36 g/mol of Cl = 58 g/mol of NaCl. Next, we take the amount of grams you have (26 grams) and divide it by the molar mass of NaCl to find the number of moles in your sample. 26 g NaCl / 58 g/mol of NaCl = .45 mol NaCl. Finally, we convert that to the number of NaCl molecules in a mole by multiplying .45 moles by 6.02x1023. This equals 2.7x1023 molecules. Because, technically, NaCl is made up of 2 atoms per molecule, you can multiply that by 2, giving 5.7x1023 atoms.
Is 45 Nacl a hypertonic solution?
Yes
How many moles of water are contained in one mole of this hydrate in alum containing 45 percent water?
The moles number of water 12; the chemical formula is KAl(SO4)2.12H2O.
How many moles of insulin are need to make up 45 ml of 0.0052m insulin solution?
To calculate the number of moles of insulin needed, you can use the formula: moles = Molarity × Volume (in liters). In this case, 0.0052 mol/L × 0.045 L = 0.000234 moles of insulin are required to make up a 45 ml solution.
How many moles of gas does a steel cylinder witha volume of 45 liters contain at standard temp pressure?
stp= 22.4 dm3, 1L = 1 dm3 1mole ---> 22.4dm3 xmole ---> 45dm3 45/22.4 = 2.001 moles
What is 0.45 NACL?
.45 what? Grams? in that case its 0.45 grams of salt
How many mol of bromide ions are in 0.500 L of a 0.300 M solution of AlBr3?
Molarity is mols of solute/volume of solution. We will do this in two parts, though you could use one conversion string. 0.300 M AlBr3 = mols/0.500L = 0.15 mols of AlBr3 (3mol Br/1 mol AlBr3 )( 6.022 X 10^23/1mol Br )(1mol Br/6.022 X 10^23 ) = 0.45 moles of Br
How many moles are in 45g of F?
The molecular mass of fluorine gas, F2 is 2(19.0) = 38.0Amount of F2 = mass of sample/molar mass = 9.5/38.0 = 0.25mol There are 0.25 moles of fluorine in a 9.5g pure sample.
How would you prepare 30mL of a 5M NaCl solution from a 2M NaCl stock solution?
You have to evaporate (by open boiling) 45 mL of the 75 mL 2M NaCl solution thus reducing the volume to 30 mL 5M NaCl.
How many molecules are in 45 g of silver?
To determine the number of molecules in 45 g of silver, you first need to calculate the number of moles of silver using its molar mass (107.87 g/mol). Then, you can use Avogadro's number (6.022 x 10^23) to convert moles to molecules.
How many atoms are in 45 grams of pb?
To find the number of atoms in 45 grams of Pb (lead), we need to first calculate the number of moles. The molar mass of Pb is approximately 207.2 g/mol. By dividing the given mass by the molar mass, we can find the number of moles. Then, we can convert moles to atoms using Avogadro's number (6.022 x 10^23 atoms/mol).
