To answer this problem, we need to count the electrons in the given configuration. The complete configuration is 1s2 2s2 2p6 3s2 3p6. There are 2+2+6+2+6 equal to 18 electrons. We find next the element with an atomic number of 18. That element is noble gas argon.
Molar mass of Li = 6.9 g/mol
6.9 g -------------------- 6.0x10²³ atoms
g -------------------- 2.75x10^21 atoms
6.0x10²³ g = 6.9 * (2.75x10^21)
6.0x10²³ g = 1.8975x10²²
g = 1.8975x10²² / 6.0x10²³
x = 0,0317 g
answer b
hope this helps!.
Answer:
<h2>Density = 0.00026 g/mL</h2>
Explanation:
The density of a substance can be found by using the formula
<h3>
</h3>
From the question
mass of air = 1.2 g
volume = 4,555 mL
Substitute the values into the above formula and solve for the density
That's
<h3>
</h3>
= 0.0002634
We have the final answer as
<h3>Density = 0.00026 g/mL</h3>
Hope this helps you
C or A I may be incorrect but those are what I think it is