We are asked to find the mass of 0.250 mol of NaOH
molar mass of NaOH - 40 g/mol
in other words 1 mol of NaOH has a mass of 40 g
therefore 0.250 mol of NaOH has a mass of - 40 g/mol x 0.250 mol = 10.0 g
mass of 0.250 mol of NaOH is 10.0 g
Answer:
Element Symbol Mass Percent
Chlorine Cl 28.930%
Oxygen O 39.166%
Potassium K 31.904%
Explanation:
Again, out my module hope this is helpfull!
Two atoms of different elements that are chemically combined are called compounds.
Answer:
3.0 atm is correct
Explanation:
303,900 pa = 2.999259 atm
303,900 pa = 2279.4371 mmHg
Answer:
0.643 mol.
Explanation:
- We can use the general law of ideal gas: <em>PV = nRT.</em>
where, P is the pressure of the gas in atm (P = 4.0 atm).
V is the volume of the gas in L (V = 4000 mL = 4.0 L).
n is the no. of moles of the gas in mol (n = ??? mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 30ºC + 273 = 303 K).
<em>∴ n = PV/RT </em>= (4.0 atm)(4.0 L)/(0.0821 L.atm/mol.K)(303 K) = <em>0.643 mol.</em>