You need 0.111 g of NH₃ to provide the same number of molecules as
in 0.95 g of SF₆.
<em>Step 1</em>. Convert grams of SF₆ to moles of SF₆
Moles of SF₆ = 0.95 g SF₆ × (1 mol SF₆/146.06 g SF₆) = 0.006 50 mol SF₆
Now, we can use the knowledge that <em>1 mol of anything has the same number of molecules</em> (Avogadro’s number) <em>as 1 mol of anything else</em>
.
Thus, 0.006 50 mol NH₃ has the same number of molecules
as 0.006 50 mol SF₆.
<em>Step 2</em>. Convert moles of NH₃ to grams of NH₃.
Mass of NH₃ = 0.006 50 mol NH₃ × (17.03 g NH₃/1 mol NH₃) = 0.111 g NH₃
Answer:
Bohr's model of the hydrogen atom is based on three postulates:
1) An electron moves around the nucleus in a circular orbit,
2) An electron's angular momentum in the orbit is quantised,
3) The change in an electron's energy as it makes a quantum jump from one orbit to another is always accompanied by the emission or absorption of a photon. Bohr's model is semi-classical because it combines the classical concept of electron orbit (postulate 1) with the new concept of quantisation ( postulates 2 and ).
Answer:
6
Explanation:
The atomic number (chemical sombol) is 6
Answer:
pH 4 represents an acidic