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
wel
3 years ago
10

some inkjet printers produce picoliter-sized drops. how many water molecules are there in one picoliter of water? the density of

water is 1.00g/ml.
Chemistry
1 answer:
GrogVix [38]3 years ago
4 0

3.37 x 10¹⁰ molecules

Explanation:

Given parameters:

Volume of water = 1pL = 1 x 10⁻¹²L

Density of water = 1.00g/mL = 1000g/L

Unknown:

Number of water molecules = ?

Solution:

To solve this problem, we first find the mass of the water molecule in the inkjet.

       Mass of water = density of water x volume of water

Then, the number of molecules can be determined using the expression below:

        number of moles = \frac{mass of water}{molar mass of water}

 Number of molecules = number of moles x 6.02 x 10²³

Solving:

Mass of water = 1 x 10⁻¹² x 1000 = 1 x 10⁻⁹g

Number of moles:

Molar mass of H₂O = 2 + 16 = 18g/mol

Number of moles = \frac{1 x 10^{-12} }{18} = 5.6 x 10⁻¹⁴moles

Number of molecules =  5.6 x 10⁻¹⁴   x   6.02 x 10²³ = 33.7 x 10⁹

                                     = 3.37 x 10¹⁰ molecules

Learn more:

Number of molecules brainly.com/question/4597791

#learnwithBrainly

You might be interested in
Can someone please help me by answering this question??
NeX [460]

Answer: 12N IT IS JUST MATH

8 0
3 years ago
Match the vocabulary terms to their definitions.
vesna_86 [32]

Answer:

1. The standard metric unit of length is a meter.

2. A proposed explanation for a scientific problem is a hypothesis.

3. The standard unit of volume is a liter.

4. The curved top surface of a liquid column is the meniscus.

5. A quantity in an experiment that remains unchanges or constant is a controlled variable (control)

6. The amount of matter in an object is mass.

7 0
3 years ago
Read 2 more answers
When a piece of metal A is placed in a solution containing ions of metal B, metal B plates out on the piece of A.(a) Which metal
zmey [24]

While metal B is being reduced from an ion to a solid metal, metal A is being oxidized.

Metal A is being displaced because, through oxidation, it transforms from a solid metal to ions in a solution.

What is Oxidation ?

Redox reactions include a change in the oxidation state of the substrate. Loss of electrons or a rise in an element's oxidation state are both considered to be oxidation.

Gaining electrons or lowering the oxidation state of an element or its constituent atoms are both examples of reduction.

In general, the term "reduction" refers to a reaction in which a chemical receives additional electrons; the compound that gets electrons is referred to as being reduced. We can think of the transformation of a ketone or an aldehyde into an alcohol as a two-electron reduction because hydride can be thought of as a proton plus two electrons.

So finally we can say that Metal A is being oxidized.

To know more about Oxidation please click here : brainly.com/question/25886015

#SPJ4

5 0
1 year ago
A 15.0-L scuba diving tank contains a helium-oxygen (heliox) mixture made up of 23.0 g of He and 4.14 g of O2 at 298 K. Calculat
EleoNora [17]

<u>Answer:</u> The mole fraction of Helium is 0.978 and that of oxygen gas is 0.022

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}      .....(1)

  • <u>For helium:</u>

Given mass of helium = 23 g

Molar mass of helium = 4 g/mol

Putting values in equation 1, we get:

\text{Moles of helium}=\frac{23g}{4g/mol}=5.75mol

  • <u>For oxygen gas:</u>

Given mass of oxygen gas = 4.14 g

Molar mass of oxygen gas = 32 g/mol

Putting values in equation 1, we get:

\text{Moles of oxygen gas}=\frac{4.14g}{32g/mol}=0.129mol

Mole fraction of a substance is given by:

\chi_A=\frac{n_A}{n_A+n_B}

  • <u>For helium:</u>

Moles of helium = 5.75 moles

Total moles = [5.75 + 0.129] = 5.879 moles

Putting values in above equation, we get:

\chi_{(He)}=\frac{5.75}{5.879}=0.978

  • <u>For oxygen gas:</u>

Moles of oxygen gas = 0.129 moles

Total moles = [5.75 + 0.129] = 5.879 moles

Putting values in above equation, we get:

\chi_{(O_2)}=\frac{0.129}{5.879}=0.022

Hence, the mole fraction of Helium is 0.978 and that of oxygen gas is 0.022

3 0
3 years ago
Given the two reactions PbCl2(aq)⇌Pb2+(aq)+2Cl−(aq), K3 = 1.84×10−10, and AgCl(aq)⇌Ag+(aq)+Cl−(aq), K4 = 1.14×10−4, what is the
Nimfa-mama [501]

Answer: The value of equilibrium constant for reaction is, 1.42\times 10^{-2}

Explanation:

The given chemical equations are:

(1) PbCl_2(aq)\rightleftharpoons Pb^{2+}(aq)+2Cl^-(aq) ;  K_3=1.84\times 10^{-10}

(2) AgCl(aq)\rightleftharpoons Ag^{+}(aq)+Cl^-(aq) ;  K_4=1.14\times 10^{-4}

Now we have to calculate the equilibrium constant for chemical equation as:

PbCl_2(aq)+2Ag^{+}(aq)\rightleftharpoons 2AgCl(aq)+Pb^{2+}(aq) ;  K=?

We are reversing reaction 2 and multiplying reaction 2 by 2 and then adding both reaction, we get the final reaction.

The equilibrium constant for the reverse reaction will be the reciprocal of that reaction.

If the equation is multiplied by a factor of '2', the equilibrium constant of that reaction will be the square of the equilibrium constant.

If we are adding equations then the equilibrium constants will be multiplied.

The value of equilibrium constant for reaction is:

K=(\frac{1}{K_4})^2\times K_3

Now put all the given values in this expression, we get:

K=(\frac{1}{1.14\times 10^{-4}})^2\times (1.84\times 10^{-10})

K=1.42\times 10^{-2}

Hence, the value of equilibrium constant for reaction is, 1.42\times 10^{-2}

7 0
3 years ago
Other questions:
  • The electrons that are passed to nadp at the end of the electron transfer chain were obtained from
    9·1 answer
  • Gold can undergo transmutation. es001-1.jpg This type of nuclear decay is called .
    9·2 answers
  • When two atoms combine by transferring electrons, it is a(n) _____ bond.<br> ionic<br> covalent
    15·1 answer
  • PLEASE HELP ASAP. I WILL MARK BRAINLIEST!!!
    12·2 answers
  • An environmental scientist performs research to discover what is in the solid garbage of the average American family. She calcul
    9·1 answer
  • In Rutherford experiment some alpha particles fired at a gold foil bounced backward as a result of ... A.reflection from the sur
    15·2 answers
  • Yttrium-90, Y90 , is a radioactive isotope used in the treatment of liver cancer. The half‑life of Y90 is 2.67 days. If a dose w
    5·1 answer
  • Calculate the pressure in Pascals when a box with a weight force of 294 Newtons is placed on its base which measures 24cm by 12c
    14·1 answer
  • The weight of an object never changes.<br><br><br> A. True B. False
    5·2 answers
  • Explain why when an ion is formed, the mass of the atom does not change.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!