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
Luda [366]
2 years ago
5

Find mass percent of each element URGENT PLS HELP!!!

Chemistry
1 answer:
VARVARA [1.3K]2 years ago
8 0

Answer: Think and you will get it right!

Explanation:

To find the mass percent composition of an element, divide the mass contribution of the element by the total molecular mass. This number must then be multiplied by 100% to be expressed as a percent.

You might be interested in
In an experiment, hydrochloric acid reacted with different volumes of sodium thiosulfate in water. A yellow precipitate was form
morpeh [17]

Answer:

The time taken for the cross to become invisible decreases.

Explanation:

We know that one of the factors affecting the rate of reaction is the concentration of reactants. From the collision theory, we know that the higher the concentration of reactants, the greater the possibility of effective collision between reactants leading ultimately to an increase in the rate of reaction. Increase in the rate of reaction implies that the reaction takes a shorter time to reach completion.

In the case of the reaction shown in the question, the point when the reaction is completed is observed by the time take for the cross mark to become invisible. If we look at the given data closely, we will notice that the volume of acid was held constant, the volume of thiosulphate was increased gradually while the volume of water was decreased accordingly. This implies that the concentration of the reactants was increased. Decreasing the volume of water increases reactant concentration.

As explained above, increase in reactant concentration increases the rate of reaction. Hence, the rate of reaction of the acid and thiosulphate increases as reactant concentration increases and the cross mark becomes invisible faster. This implies that in the last column for time taken for the cross to become invisible, the values of time decreases steadily as concentration of reactants increases.

5 0
3 years ago
A 400 ml sample of gas is heated from -20 c to 60
Viktor [21]
Using p1v1/t1=p2v2/t2
p1=50
p2=225
v1=400ml
v2=?
t1=-20=253k
t2=60=333k
50x400/253=225xv2/333
7.9=0.7xv2
v2=7.9/0.7
v2=11.3ml
6 0
3 years ago
Read 2 more answers
How many moles of brcl form when 2.74 mol cl2 react with excess br2?
egoroff_w [7]
Following reaction arise between Br2 and Cl2

Br2   +               Cl2     →     2BrCl
(1mole)           (1mole)         (2moles)

From above balanced reaction, it can be seen that 1 mole of Br2 reacts with 1 mole of Cl2 to form 2 mole of BrCl

Thus, when <span>2.74 mol Cl2 reacts with excess Br2, 2.74 X 2 = 5.48 moles of BrCl will be formed. </span>
5 0
3 years ago
Given the unbalanced equation: Al + O2 → Al2O3
ArbitrLikvidat [17]
I believe it's 1. 9.
6 0
3 years ago
Why would you want to use a material that is not likely to undergo a phsical change for your stepping stone?
nadya68 [22]
Because a good stepping stone would be a solid and if that solid were to melt or turn to gas you’d have no stepping stone.
5 0
2 years ago
Other questions:
  • What functional group of aspirin causes it to irritate the stomach?
    8·2 answers
  • Nitrogen has an atomic number of 7; therefore, it has ______ electrons in its outermost electron shell.
    14·1 answer
  • Q5-P1 is 1.00atm and V1 is 3.00L. We've now changed the volume so P2 is 0.700atm. Use Boyle's Law, how much is V2? *Round your a
    13·2 answers
  • Why do the vinegar and oil in a salad dressing separate into layers if left standing for too long?
    10·1 answer
  • C9H8O4 Aroms in formula
    12·2 answers
  • The four structures that both prokaryotic and eukaryotic cells have are
    5·1 answer
  • HELP PLEASE Which type of power generation can produce carbon dioxide? solar hydroelectric coal wind
    6·2 answers
  • Oliver needs to standardize a base solution by titration with an acid solution of known concentration. He finds the volume of th
    14·1 answer
  • Condensation point AND freezing point of oxygen in C and F?
    5·1 answer
  • plz help very many points so there better be an answer if u say i just need the points sorry i will report u.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!