A mole of sodium chloride has mass 58.44 grams. You get that from adding the molar masses of sodium and chlorine, which are listed on the periodic table.
<span>58.44 g/mol * 4.40 mol = 257.1 or ≈ 257 grams with 3 significant figures</span>
Answer:
1.41 moles H2O2(with sig figs)
Explanation:
okay so what is the molar mass of H2O2= (1.008 g/mol)2+(16.00g/mol)2= (2.016+ 32.00) g/ mol
= 34. 02 g/mol
48.0g H2O2* 1 mol H2O2/ 34.02 g H2O2= 1.41 mol H2O2
Answer:
8.18 M
Explanation:
The osmotic pressure (π) is a colligative property that can be calculated using the following expression.
π = M . R . T
where,
M: molarity
R: ideal gas constant
T: absolute temperature
The absolute temperature is 25 + 273 = 298 K.
The osmotic pressure (in atm) is:
π = M . R . T
200 atm = M . (0.08206 atm.L/mol.K) . 298 K
M = 8.18 mol/L