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
Alex777 [14]
3 years ago
5

La is element 57 on the periodic table a sample contains 2.82 * 10€25 power atoms of La calculate the amount of LA

Chemistry
1 answer:
vodka [1.7K]3 years ago
5 0

Answer:

n=46.8molLa\\\\m=6.50x10^3gLa

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to calculate both moles and grams of lanthanum by using the Avogadro's number as a relationship of atoms to moles and its atomic mass as a relationship to moles to grams to obtain the following:

n=2.82x10^{25}atomsLa*\frac{1molLa}{6.022x10^{23}atomsLa}=46.8molLa\\\\m=46.8molLa*\frac{138.9gLa}{1molLa}  =6.50x10^3gLa

Regards!

You might be interested in
Jada Peterson
barxatty [35]

Answer: A

Explanation:

4 0
2 years ago
Consider the following reaction
Fynjy0 [20]

Answer:

92.72 kJ

Explanation:

2 N₂ (g) + O₂ (g) —-> 2 N₂O

According to question , one mole of N₂O requires 163.2 kJ of heat

Molecular weight of N₂O = 44 gm

25 g  N₂O = 25 / 44 mole

25 / 44 mole will require 163.2 x 25 / 44 kJ

= 92.72 kJ

6 0
3 years ago
Draw the Lewis structure for BrCl3. What are the approximate bond angles about the central atom?
Korvikt [17]

Answer:

Explanation:

BrCl₃ is an interhalogen compound with a hybridization of sp³d. The approximate bond angles can be predicted from the structure (attached below). Although, the lewis structure might be predicted to be trigonal bipyramidal from the structure, it is however a T-shaped geometry because of it's two lone pairs.

Also, from the structure attached, it can be predicted that the approximate bond angles about the central atom is 120° (360 ÷ 3) since each of the three chlorine atoms is equally spaced about the central atom.

7 0
2 years ago
3) In the Hydrolysis of Disaccharides and Polysaccharides portion of the lab, starch should give one positive iodine test and on
AfilCa [17]

Answer: potassium iodide is the basic test for starch,and the positive test is blue-black coloration, any other test substance which is not starch will give a negative results.

Explanation:

Starch is an example of  polysaccharide  and since the standard test for it is potassium iodide solution, it gives a positive test.

Diasaccharides e.g maltose are reducing sugars.their standard test is BENEDICT test .

Therefore, in the hydrolysis;  starch should give a positve test, while Diasaccharides should give negative rest.

3 0
3 years ago
A fusion reaction releases energy because the binding energy of the resulting nucleus:______.
KIM [24]

Answer:

a. is released in the process

Explanation:

In fusion reaction the nucleus is unstable so it releases its binding energy resulting in decreasing its mass so it becomes more stable.

7 0
3 years ago
Other questions:
  • Why climate change can create drought in one area and flooding in another
    13·1 answer
  • if a drop of blood is 0.05 mL, how many drops of blood are in a blood collection tube that holds 6 mL?
    15·1 answer
  • An atom with one valence electron combines with an atom with seven valence electrons.
    15·1 answer
  • Identify the compound with the highest percent ionic character. identify the compound with the highest percent ionic character.
    11·1 answer
  • 1. Separation of amino acids by ion-exchange Chromatography. Mixtures of amino acids can be analyzed by first separating the mix
    10·1 answer
  • How long will it take a piece of strontium-90 (produced in a nuclear test blast) weighing exactly 1000.0 g to be
    8·1 answer
  • Why is there need to standardize a solution​
    15·1 answer
  • What is the difference between active transport and passive transport? Which one requires energy?
    14·1 answer
  • In a water molecule, the shared electrons spend more time around
    11·1 answer
  • An atom contains three protons, two neutrons, and one electron. What is the charge of the nucleus?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!