1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Levart [38]
3 years ago
9

A hydrochloric acid solution contains 36 percent HCl by mass. Calculate its molality

Chemistry
1 answer:
Delvig [45]3 years ago
5 0
The Molarity M of a solute in a solution is defined as:

M=moles of solution / kilograms of solvent

Mass %= (mass solute/mass solution)x100%

Assume 100g of solution

Find moles of solute

Mass solute = (mass %/100%)mass solution

=(36%/100)100g=36 gHCL

36 gHCL 1 mol HCL/36.458 gHCL= 0.987molHCL

36% HCL by mass 100 g solution
36g HCL 0.987Mol HCL

Molarity=moles solute/kg solvent

Find kg solvent
Mass solution = mass solute + mass solvent
Mass solvent = mass solution - mass solute
= 100 g-36=64 g solvent

64 g solvent = 1 kg solvent/1000 g solvent = 0,064 kg solute

Molarity= molHCL/0.064 kg solvent

=0.987/0.064
=15.42 mHCL
You might be interested in
At 100°C, the Kw of water is 5.6x10−13. What is the pOH of a solution that has a pH of 6.25 at 100°C? A) 6.00 B) 6.25 C) 7.00 D)
Alex_Xolod [135]

Answer:

The pOH of a solution that has a pH of 6.25 at 100°C is 7.75 (option D)

Explanation:

pOH + pH = 14

pOH = 14 - 6.25

pOH = 7.75

Therefore, at 100°C, the Kw of water is 5.6x10⁻¹³ and the pOH of a solution that has a pH of 6.25 at 100°C is 7.75.

Thus, option D, is the correct answer.

8 0
4 years ago
Read 2 more answers
Pleas help me!
xeze [42]

Answer:

Explanation:

Question 1:

atomic number/number of protons

All atoms of the same element share the same number of protons or atomic numbers. In grouping elements on the periodic table, the periodic law is often used. The modern periodic law states that "properties of elements are a periodic function of their atomic number". The atomic number of an element distinguish it from others.

Question 2:

The two carbon atoms would be quite different as they are isotopes. Isotopy is the existence of two or more atoms of the same element having  the same atomic number but different mass numbers due to the differences in the number of neutrons in their various nuclei.

Naturally, carbon exists in two isotopic forms:

                        ¹³₆C and ¹⁴₆C

One might see these different samples in a rock and in the skin cells. They are simply isotopes. Isotopes have the same electronic configuration and hence similar chemical properties. Only their masses differ.

4 0
4 years ago
Read 2 more answers
How many sites on this antibody molecule have potential to bind to a non-self molecule?
Svetradugi [14.3K]
There are two sites on the antibody molecule that have a potential to bind to a non-self molecule. The Fab of an antibody is the region of the antibody that binds to an antigen. It consist of one constant and one variable domain from each heavy and light chain of the antibody. During immune reaction, an antigen-antibody reaction occurs between the antibodies made by the B cells and the antigens.

7 0
3 years ago
Pls help, the questions in the picture !
dedylja [7]

Answer:

B is sedimentary and A is metermorphic

4 0
3 years ago
PLEASE HELP!!
Ray Of Light [21]
So that every measurement is accurate.. hope this helps
7 0
3 years ago
Other questions:
  • How Do Covalent Form Between Atoms?
    11·1 answer
  • Which of the following is the weakest?. . A. polar covalent bond. . B. dipole interaction. . C. ionic bond
    15·2 answers
  • List one benefit and one limitation of using scientific models.
    11·1 answer
  • How many liters are contain 1.75 mol of f2 gas at stp?
    9·1 answer
  • A sample of argon gas has a volume of 735 mL at a pressure of 1.20 atm and a temperature of 112 ∘C. What is the final volume of
    12·1 answer
  • You add two substances together in a sealed bag and a chemical reaction happens. The mass before the reaction was 167 g. What wa
    14·1 answer
  • How old is a bone if it now .3125 of C-14 when it originally had 80.0g of C-14
    13·1 answer
  • What happens to the conductivity of water when a base is dissolved in it.
    11·1 answer
  • For a reversible reaction, it is likely that _____ is/are present at equilibrium. *
    11·1 answer
  • What happens as a result of photoelectric effect
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!