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
spayn [35]
3 years ago
10

Express as an ordinary number. 3.85 x 10 -3 = 0.00385 3,850 0.385

Chemistry
2 answers:
Marta_Voda [28]3 years ago
7 0
Hey there, 

The answer is 0.00385

Hope it helped!
Rzqust [24]3 years ago
6 0
0.00385. Have a great day :)
You might be interested in
Draw the structure of the bromohydrin formed when (Z)-3-hexene reacts with Br2/H2O. Use the wedge/hash bond tools to indicate st
Ipatiy [6.2K]

Answer:

(3R,4R)-4-bromohexan-3-ol

Explanation:

In this case, we have  reaction called <u>halohydrin formation</u>. This is a <u>markovnikov reaction</u> with <u>anti configuration</u>. Therefore the halogen in this case "Br" and the "OH" must have <u>different configurations</u>. Additionally, in this molecule both carbons have the <u>same substitution</u>, so the "OH" can go in any carbon.

Finally, in the product we will have <u>chiral carbons</u>, so we have to find the absolute configuration for each carbon. On carbon 3 we will have an "R" configuration on carbon 4 we will have also an "R" configuration. (See figure 1)

I hope it helps!

5 0
3 years ago
What is the total number of electrons found in an atom of sulfur?<br> (1) 6 (2) 8 (3) 16 (4) 32
Anna007 [38]
8.........................................................................................
4 0
3 years ago
How many molecules are in 165 grams g of carbon dioxide ?
KATRIN_1 [288]

Answer:

There are 2.258 x 10^24 molecules of CO2 in 165 grams of CO2.

Explanation:

First you have to calculate the molar mass of carbon dioxide ⇒ 44 grs/mol. Then,

44 grs ------------- 1 mol CO2

165 grs ------------ x = 3.75 moles of CO2.

Then, from Avogadros constant we have that there are 6.022 x 10^23 molecules in 1 mol. So,

1 mol CO2 ---------------- 6.022 x 10^23 molecules CO2

3.75 moles CO2-------- x = 2.258 x 10^24 molecules CO2.

There are 2.258 x 10^24 molecules CO2 in 165 grams of CO2.

3 0
3 years ago
The concentration of the KCN solution given in Part A corresponds to a mass percent of 0.473 %. What mass of a 0.473 % KCN solut
tiny-mole [99]
If the Ka of HCN = 5.0 x 10^-10
Since
(Ka) (Ka) - 1 x 10^ -14
then
the Kb of its conjugate base (CN-) = 2.0 X 10^-5

since
pH + pOH = 14
when the pH = 10.00
then
the pOH = 4.00
& the OH-
would then equal 1.0 X 10^-4

NaCN as a base does a hydrolysis in water:
CN- & water --> HCN & OH-
notice that equal amounts of OH- & HCN are formed

Kb = [HCN] [OH-] / [CN-]

2.0 X 10^-5 = [1.0 X 10^-4] [1.0 X 10^-4] / [CN-]

[CN-] =(1.0 X 10^-8) / (2.0 X 10^-5)

[CN-] = (5.0 X 10^-4)

that's 0.00050 Molar
which is 0.00050 moles in each liter of aqueous KCN solution
which is
0.00025 moles KCN in 500. mL of aqueous KCN solution

use molar mass of KCN, to find grams:
(0.00025 moles KCN) (65.12 grams KCN / mole) = 0.01628 grams of KCn

which is 16.3 mg of KCN
& rounded to the 2 sig figs which are showing in the Ka of HCN , "5.0" X 10^-10
your answer would be
16 mg of KCN

sorry even after making a correction in calcs , I don't get one of your answers.
the only way that I could get one of them is to pretend that yours was a 1 sig fig problem,
in which case your 16 mg would round off to 20 mg.
but you have 3 sig figs in "500. ml", & 2 sig figs in both the "pH of 10.00."
& The Ka of HCN = "5.0 x 10^-10."

it does however take 12 mg of NaCN, to make 500. mL of aqueous solution pH of 10.00. the molar mass of NaCN has the smaller molar mass of 49.00 grams per mole.
maybe they meant NaCN, but wrote KCN instead.

I hope i answered this correctly for you.
8 0
4 years ago
Most scientific discoveries are made when scientists work collaboratively
postnew [5]
I believe it’s B. At least thats what makes sense for me.
7 0
3 years ago
Other questions:
  • The number of _______________ in the nucleus determines an element's atomic number. this number defines the name of the element,
    6·1 answer
  • air in a closed container with a fixed volume is heated from 25 c to 36 c if the pressure is initially at 3.8atm what would the
    15·1 answer
  • Would tearing aluminum foil be a physical change
    5·1 answer
  • When an object is thrown, the thrower pushes the object. This causes the object to move in a
    14·1 answer
  • Match the Parts of a Transverse Wave Question 4 options: Distance from rest position to the crest or trough Lowest point of a wa
    13·1 answer
  • Can someone please help me​
    9·1 answer
  • 7) An ionic bond could form between:
    11·1 answer
  • 2
    5·1 answer
  • You’re taking a walk on a warm fall morning. The temperature is about 70 degrees Fahrenheit, and you cannot see a cloud anywhere
    8·1 answer
  • What is the total Mass of Reactants in Alpha Decay
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!