Answer:
WHAT IS THE DEFINITION FOR ISOTOPES
<u><em>the same atomic number (number of protons), but different mass number of neutrons and protons.</em></u>
WHAT ARE EXAMPLES OF ISOTOPES
<em><u>carbon</u></em>
<em><u>nitrogen</u></em>
<em><u>hydrogen</u></em>
WHAT ARE NON EXAMPLES OF ISOTOPES
<u><em>tiger-striped cat</em></u>
<u><em>idk other ones sorry...</em></u>
The translation of the question is
Commercial solutions of HCl (MP = 36.5 g / mol) are typically 39.0% W / W of this acid in water. Determine the molality of the HCl solution if its density is equal to 1.20 g / ml.
Answer:
Molality is 17.51 molal
Explanation:
We are given 39% w/w of HCl, this means for every 100g of this solution we have 39g of HCl in it.
to ease the calculation we assume we have 1L(1000ml) of this solution is present.
Density = mass /volume
1.20 = mass/1000
mass = 1200 g of solution
and we are given that 39% of this solution is will contain HCl
so
1200 * 39/100 = 468g of HCl present
no of moles of HCl = 468/36.5 = 12.82moles
mass of solution = mass of water + mass of acid
mass of water = mass of solution - mass of acid
Mass of water = 1200 - 468 = 732g of water
Molality = moles /masss of water in kg
= 12.82 *1000/732 =17.51molal
I think it would be either dead bodies or rocks? i dont really understand too well but sorry if this doesn’t help!! :((
Explanation:
I need a help of math.
please can someone help me ?
