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
Akimi4 [234]
3 years ago
14

A sample of an unknown gas at STP has a density of 0.630 gram per liter. What is the gram molecular mass of this gas?

Chemistry
1 answer:
jeyben [28]3 years ago
3 0
<span>STP means standard temperature and pressure at 0°C (273K) and 1 atm (atmosphere). The density of the unknown gas is 0.63 gram per liter. The deal gas equation is PV = nRT. The n is the numer of moles and can be represented as mass of the gas, m, divided by the molar mass, c.  so we have,</span>  

PV = nRT
PV = (m/c)RT
Since the density is d = m/V
Pc = (m/V)RT
Pc = dRT
c = drT/P  

substitute the values into the equation,
c = [(0.63g/L)(0.08206 L-atm/mol-K)(273K)]/(1atm)
<u>c = 14.11 g/mol</u>
You might be interested in
Which one of the following is not a fossil fuel?
Finger [1]

The answer is C, Uranium.

Natural gas, coal, and oil are all naturally made from fossils. Uranium is an element which can be found on the Periodic Table of Elements.

5 0
3 years ago
Read 2 more answers
How many moles of Cu(OH)2 are soluble in 1L of sodium hydroxide (NaOH) when the pH is 8.23?
Morgarella [4.7K]

Answer:

4.96E-8 moles of Cu(OH)2

Explanation:

Kps es the constant referring to how much a substance can be dissolved in water. Using Kps, it is possible to know the concentration of weak electrolytes. Then, pKps is the minus logarithm of Kps.

Now, we know that sodium hydroxide (NaOH) is a strong electrolyte, who is completely dissolved in water. Therefore the pH depends only on OH concentration originating from NaOH. Let us to figure out how much is that OH concentration.

pH= -log[H]\\pH= -log (\frac{kw}{[OH]})

8.23 = - log(\frac{Kw}{[OH]} \\10^{-8.23} = Kw/[OH]\\ [OH] = Kw/10^{-8.23}

[OH]=1.69E-6

This concentration of OH affects the disociation of Cu(OH)2. Let us see the dissociation reaction:

Cu(OH)_2 -> Cu^{2+} + 2OH^-

In the equilibrum, exist a concentration of OH already, that we knew, and it will be added that from dissociation, called "s":

The expression for Kps is:

Kps= [Cu^{2+}] [OH]^2

The moles of (CuOH)2 soluble are limitated for the concentration of OH present, according to the next equation.

Kps= s*(2s+1.69E-6)^2

"s" is the soluble quantity of Cu(OH)2.

The solution for this third grade equation is s=4.96E-8 mol/L

Now, let us calculate the moles in 1 L:

moles Cu(OH)_2 = 4.96E-8 mol/L * 1 L = 4.96E-8 moles

7 0
3 years ago
I WILL MARK YOU BRAINLYEST
Agata [3.3K]

Answer:

Osmosis is the diffusion of  ⇒ water across a selectively permeable membrane. This process does not require the cell to use ⇒ energy to move molecules. It is an example of ⇒ passive transport.

Explanation:

3 0
3 years ago
Read 2 more answers
Where do surface waves occur
Verizon [17]

In physics, a surface wave can occur along any boundary of two different substances. The seismic type of surface wave happens at the boundary between air and rock—the surface of the earth.

Hope this helped you!

God bless ;)

6 0
3 years ago
What condition must be satisfied by a balanced chemical equation?
Zolol [24]

Answer:

The chemical equation needs to be balanced so that it follows the law of conservation of mass. A balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side. Balancing chemical equations is a process of trial and error.

Explanation:

8 0
3 years ago
Other questions:
  • You're legally obligated to yield the right-of-way:
    8·1 answer
  • What is the mole fraction of solute and the molal concentration for an aqueous solution that is 16.0% NaOH by mass?
    6·1 answer
  • What is the acronym for DNA??
    13·1 answer
  • How are atoms and molecules the same and how are they different?
    5·1 answer
  • The synthesis of dipropyl ether can be accomplished using 1-propanol. What reactants and conditions are necessary for this to oc
    15·1 answer
  • Science fair ideas? please help
    11·2 answers
  • Weather, such as thunderstorms or rain showers, takes place in the _____. A. troposphere B. mesosphere C. stratosphere D. thermo
    10·2 answers
  • PLS HELP!! it’s science how do waves travel through gas
    13·1 answer
  • How many molecules Of H20 are<br> equivalent to 97.2 g H20?<br> (H = 1.008 g/mol, O = 16.00 g/mol)
    9·1 answer
  • Why is a solution not a pure substance?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!