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
lorasvet [3.4K]
1 year ago
9

An ion has 56 protons, 54 electrons, and 81 neutrons. What is its atomic number ?

Chemistry
2 answers:
-BARSIC- [3]1 year ago
8 0

The Atomic Number indicates the number of protons = 56

EastWind [94]1 year ago
5 0

Answer: The barium – 137 atom would have 56 protons, 56 electrons and 81 neutrons. The barium – 137 cation would have 56 protons, 54 electrons and 81 neutrons.

Explanation: Hope this is helpful

You might be interested in
Question 12 A chemistry student must write down in her lab notebook the concentration of a solution of sodium thiosulfate. The c
o-na [289]

Weight of sodium thiosulfate   = 76.148 - 8.2

= 67.948 g.

Concentration of the solution = 67.948 / 172.7

= 0.393 g / mL.  to the nearest thousandth . (answer).

3 0
3 years ago
A hydrogen halide diffuses 1.49 times faster than HBr. This hydrogen halide is
marysya [2.9K]

To solve this problem, we must assume ideal gas behaviour so that we can use Graham’s law:

vA / vB = sqrt (MW_B / MW_A)

where,

<span>vA = speed of diffusion of A  (HBR)</span>

vB = speed of diffusion of B (unknown)

MW_B = molecular weight of B (unkown)

MW_A = molar weight of HBr = 80.91 amu

 

We know from the given that:

vA / vB = 1 / 1.49

 

So,

1/1.49 = sqrt (MW_B / 80.91)

MW_B = 36.44 g/mol

 

Since this unknown is also hydrogen halide, therefore this must be in the form of HX.

HX = 36.44 g/mol , therefore:

x = 35.44 g/mol

 

From the Periodic Table, Chlorine (Cl) has a molar mass of 35.44 g/mol. Therefore the hydrogen halide is:

HCl

6 0
2 years ago
How many atoms are present in 179.0 g of iridium?<br> include units please:)!
denpristay [2]

Answer:

179.0 g of iridium (1 mol / 192.217 g) ( 6.022 x 10^23 atoms /  1 mol ) = 5.61 x 10^23 atoms of iridium

Explanation:

5 0
3 years ago
Read 2 more answers
At what point does sucrose actually become dissolved in the water?
Oksi-84 [34.3K]
Yes it does dissolve hope this helps
8 0
3 years ago
Suppose that 10.0 L of Carbon Dioxide gas are produced by this reaction, 4C3H5N3O9 -&gt; 12 CO2 + 10H2O + 6N2 +O2, at a temperat
siniylev [52]

The mass of nitroglycerin : 34.52 g

<h3>Further explanation</h3>

Reaction

4C₃H₅N₃O₉ ⇒ 12 CO₂ + 10H₂O + 6N₂ +O₂

Volume = 10 L

Temperature = -5°C=268 °K

Pressure = 1 atm

mol of CO₂ (ideal gas) :

\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{1\times 10}{0.082\times 268}\\\\n=0.455

mol ratio C₃H₅N₃O₉ : mol CO₂= 4 : 12, so mol C₃H₅N₃O₉ :

\tt \dfrac{4}{12}\times 0.455=0.152

mass C₃H₅N₃O₉ (MW=227,0865 g/mol):

\tt 0.152\times 227.0865=\boxed{\bold{34.52~g}}

4 0
2 years ago
Other questions:
  • pleaaaaaaaaaaaaaaaase answerrrrrrr quickkkkkkkkkkk am scared can somebody write me a small kinda article about fractional distil
    13·1 answer
  • What happens to iron when iron oxide becomes elemental iron?
    7·2 answers
  • Potassium chloride and oxygen gas are formed upon heating potassium
    6·1 answer
  • How many grams of sodium hydroxide are present in 247.0 mL of a 0.300 M NaOH solution?
    11·1 answer
  • A 110.-g sample of copper (specific heat capacity 0.20 J/C g) is heated to 82.4C and then placed in a container of water at 22.3
    5·1 answer
  • I NEED HELP ASAP!!! PLEASE!!!
    6·2 answers
  • My teacher is grading this soon can someone help me ASAP!
    10·1 answer
  • Which era did we live on in 2008
    9·2 answers
  • Which phrase is the best description of osmosis
    8·2 answers
  • I need help with this someone help
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!