40.0 is the answer, sorry, I had some lag, I would've answered it like 5 minutes ago
Hope I helped
Answer:

Explanation:
There are no molecules in NaCl, because it consists only of ions.
However, we can calculate the number of formula units (FU) of NaCl.
Step 1. Calculate the moles of NaCl

Step 2. Convert moles to formula units

There are
in 3.6 g of NaCl.
Explanation:
A pinhole camera, as name suggests, is a camera has no lens. is a light- proof box,small hole on 1 side, light thru one side. projects an inverted pic which is known as an abscura effect....
Answer:
What reaction is balanced
Answer:

Explanation:
The relation between frequency and wavelength is shown below as:

c is the speed of light having value 
Given, Frequency = 1290 kHz =
(As 1 kHz = 1000 Hz )
Thus, Wavelength is:


