calculate the molar concentration of substance in a solution containing 5,85g of Nacl2 in 200cm cube solution
There is no such substance as NaCl2.
Are you sure you have the formula right?
And to echo DrWLS' statement, Nacl isn't right either.
To calculate the molar concentration of a substance in a solution, you need to know the mass of the substance and the volume of the solution.
1. Start by finding the molar mass of NaCl2 (sodium chloride). Sodium (Na) has an atomic mass of 22.99 g/mol, and chlorine (Cl) has an atomic mass of 35.45 g/mol. Since there are two chlorine atoms in NaCl2, the molar mass of NaCl2 is:
Molar mass of NaCl2 = (2 * 35.45 g/mol) + 22.99 g/mol = 93.29 g/mol
2. Next, calculate the number of moles of NaCl2 by dividing the given mass by the molar mass:
Moles of NaCl2 = mass of NaCl2 / molar mass of NaCl2
= 5.85 g / 93.29 g/mol
Make sure to use consistent units for mass and molar mass.
3. Convert the volume of the solution from cm^3 to liters. Since 1 cm^3 is equal to 1 milliliter (ml), which is equal to 1/1000 of a liter, divide the given volume by 1000:
Volume of solution in liters = 200 cm^3 / 1000
= 0.2 liters
4. Finally, calculate the molar concentration (also known as molarity) by dividing the number of moles by the volume of the solution:
Molar concentration = Moles of NaCl2 / Volume of solution in liters
= (5.85 g / 93.29 g/mol) / 0.2 L
Solve the equation to get the numerical value of the molar concentration.