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
Ksenya-84 [330]
3 years ago
8

Please help ill medal and fan!

Chemistry
1 answer:
krok68 [10]3 years ago
6 0
Solutions for your questions are the following:
1. remaining amount is equal to:960 g : 100% = 30 g : xx = 30 g * 100% / 960 g
 = 3.125%
= 0.03125
Now, we use this formula to calculate the number of half-lives:(1/2)ⁿ = x,
so,(1/2)ⁿ = 0.03125
to calculate n, use this equation:
n*log(1/2) = log(0.03125) n = log(0.03125)/log(1/2)
= log(0.03125)/log(0.5)
= -1.505/-0.301  
n=5

Ifn = 5T = 15 min

Then
L = T/nL = 15 min/5
= 3 minutes

2. 
You should pick filtration. It is use to separate heterogeneous mixtures just like in the problem stated.

You might be interested in
What alkene(s) would be produced from the dehydration of cyclopentanol?
Ronch [10]
The dehydration of cyclopentanol is shown in the balanced equation below:

Cyclopentanol => cyclopentene + H2O

Therefore, the alkene produced from the dehydration of cyclopentanol is cyclopentene. 

The OH group is removed from the compound resulting to an alkene, cyclopentene. <span />
7 0
3 years ago
Which of the following will dissociate into the largest number of ions in solution?
Svetlanka [38]

Answer:D

Explanation:

4 0
3 years ago
Fe2O3(s) + 3CO(g) ---&gt; 2Fe(l) + 3CO2(g) Steve inserts 450. g of iron(III) oxide and 260. g of carbon monoxide into the blast
baherus [9]

Answer: Theoretical yield is 313.6 g and the percent yield is, 91.8%

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}    

\text{Moles of} Fe_2O_3=\frac{450}{160}=2.8moles

\text{Moles of} CO=\frac{260}{28}=9.3moles

Fe_2O_3(s)+3CO(g)\rightarrow 2Fe(l)+3CO_2(g)

According to stoichiometry :

1 mole of Fe_2O_3 require 3 moles of CO

Thus 2.8 moles of Fe_2O_3 will require=\frac{3}{1}\times 2.8=8.4moles  of CO

Thus Fe_2O_3 is the limiting reagent as it limits the formation of product and CO is the excess reagent.

As 1 mole of Fe_2O_3 give = 2 moles of Fe

Thus 2.8 moles of Fe_2O_3 give =\frac{2}{1}\times 2.8=5.6moles of Fe

Mass of Fe=moles\times {\text {Molar mass}}=2.6moles\times 56g/mol=313.6g

Theoretical yield of liquid iron = 313.6 g

Experimental yield = 288 g

Now we have to calculate the percent yield

\%\text{ yield}=\frac{\text{Actual yield }}{\text{Theoretical yield}}\times 100=\frac{288g}{313.6g}\times 100=91.8\%

Therefore, the percent yield is, 91.8%

6 0
3 years ago
Which forces can be classified as intramolecular?
just olya [345]

Answer:

D) Covalent Bonds

Explanation:

Quizlet says so

7 0
3 years ago
Read 2 more answers
Help me please!! What is the name of the alkyne molecule
juin [17]

Answer:

ans is (2) 2,4- hexadiene

5 0
3 years ago
Other questions:
  • Which climate conditions are typical of regions near the North Pole and the South Pole
    10·1 answer
  • What is the fubction of centrioles during metaphase
    8·1 answer
  • A _________ is an oxidizing agent that, when mixed with an oxidation hair color, supplies the necessary oxygen gas to develop co
    5·1 answer
  • Which radioactive isotope is used in treating cancer?
    5·1 answer
  • WILL RATE AND GIVE BRAINLIEST!!
    12·2 answers
  • PLZ HELP ME!!!!!! BEING TIMED!!!!!
    12·1 answer
  • Nồng độ mol của 200ml dung dịch Nacl chứa 0,5 mol chất tan là :
    12·2 answers
  • Help please I really need it. ​
    12·1 answer
  • How many molecules is 6.11 moles of Zn?
    14·1 answer
  • Which of the following examples is a molecule with a covalent bond? (Use the electronegativity values from the periodic table li
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!