Using Avogadro's Number to Calculate the Number of Molecules Say you have 2 moles of NaCl. How many molecules of NaCl is that? Here's where you can use Avogadro's number: \(\mathrm{2mol\enspace NaCl\Biggl(\dfrac{6.022\times10^{23}\enspace molecules\enspace NaCl}{1mol}\Biggr)=...
How many molecules are in 54 moles of CO2? How did Loschmidt discover Avogadro's constant? What is the relationship between Avogadro's constant and a mole? How many atoms of magnesium are in a sample of 4 moles? What are the steps to find Grams to ...
An average cup of coffee contains about 130 mg of caffeine, C8H10N4O2. How many molecules of caffeine? How many calories are contained in an 8.0 oz serving of cereal if their fuel value is 1.5 kJ/g? (1 cal = 4.184 kJ; 1 oz = 28.35 g) ...
Example: Determine the mole fraction of NaCl in a solution in which 0.10 moles of the salt is dissolved in 100 grams of water. The moles of NaCl is provided, but you still need the number of moles ofwater, H2O. Start by calculating the number of moles in one gram of water, using pe...
How many molecules of chloride are dissolved in a solution that contains 0.2 moles of calcium chloride per liter. How many moles of chloride ions are present in 18.4 g of CaCl_2? How many moles of chloride ions are in 0.04 dm^3 of 0.45 M calcium chloride CaCl_2? How many...
To prepare a 248 mM sugar solution, how many sugars (molecular weight = 309 g/mole) are required to be added to 128 mL of water? Show your work and explain. A pH of 9.75 has ... OH- molecules in concentration than pH of 5.75....
percent sodium [source: Salt Institute]. Although sodium is volatile and chlorine is toxic, together as sodium chloride they're integral to life. Sodium chloride molecules are cubical. The large chloride ions are closely packed together, with smaller sodium ions filling in the spaces between them...
Decipher which elements are present in your compound and how many molecules of each element by looking at the abbreviation in the compound name. For example, NaCl has two elements with one molecule of each element, Na (sodium) and Cl (Chlorine), and CaCl2 has two elements with one Ca (Ca...
Solutions: In chemistry, a solution is created by dissolving a substance *the solute) in another substance (the solvent). For example, when we mix table salt (NaCl) with water, we are effectively creating a solution of NaCl. Answer and Explanation:1 ...
When a number is written in front of a molecule it applies to all the atoms in the molecule. For example: H2 shows 1 molecule of 2 hydrogens bonded together, while 2NaCl shows 2 separate molecules of Na bonded to Cl, or 2 Na atoms and 2 Cl atoms in total....