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
ipn [44]
3 years ago
9

A.

Chemistry
1 answer:
Tema [17]3 years ago
8 0

Answer:

do u  i dont

Explanation:

You might be interested in
A 5.0 balloon containing nitrogen gas is cooled from 25 degrees to 5°C. What is the final volume of the balloon?
mylen [45]

Answer:

5.4

Explanation:

V1=5.0

T1=25+ 273=298

V2= z(unknown)

T2=5+273=278

V1/T1 =V2/T2

V2=V1T2/T1

=5*298/278

=5.4

5 0
3 years ago
A 30.7 g sample of Strontium nitrate, Sr(NO3)2•nH2O, is heated to a constant mass of 22.9 g. Calculate the hydration number.
Elodia [21]

Answer:

  • <em>Hydration number:</em> 4

Explanation:

<u>1) Mass of water in the hydrated compound</u>

Mass of water = Mass of the hydrated sample - mass of the dehydrated compound

Mass of water = 30.7 g - 22.9 g = 7.8 g

<u>2) Number of moles of water</u>

  • Number of moles = mass in grams / molar mass

  • molar mass of H₂O = 2×1.008 g/mol + 15.999 g*mol = 18.015 g/mol

  • Number of moles of H₂O = 7.9 g / 18.015 g/mol = 0.439 mol

<u>3) Number of moles of Strontium nitrate dehydrated, Sr (NO₃)₂</u>

  • The mass of strontium nitrate dehydrated is the constant mass obtained after heating = 22.9 g

  • Molar mass of Sr (NO₃)₂ :  211.63 g/mol (you can obtain it from a internet or calculate using the atomic masses of each element from a periodic table).

  • Number of moles of Sr (NO₃)₂ = 22.9 g / 211.63 g/mol =  0.108 mol

<u>4) Ratio</u>

  • 0.439 mol H₂O / 0.108 mol Sr(NO₃)₂ ≈  4 mol H₂O : 1 mol Sr (NO₃)₂

Which means that the hydration number is 4.

4 0
3 years ago
Read 2 more answers
Can someone please helpppp!
dolphi86 [110]

Answer: A

Aloha is the one that loses a helium

5 0
3 years ago
Convert mass to moles for both reactants. (Round to 2 significant figures.)
shepuryov [24]
Mass = mr x moles
Mr of CuCl2 = ( 63.5) + ( 35.5 x 2) = 134.5
2.5 = 134.5 x moles
2.5 / 134.5 = moles
Moles = 0.019 (2DP)

0.25g of Al
Mr of Al = 27
0.25 = 27 x moles
0.25/ 27 = 0.0093 moles (2sf)

Hope this helps :)
6 0
3 years ago
Read 2 more answers
How much heat is required to change temperature of 10 g of water from 4 °C to 8 °C? (Water has a specific heat of 4.18 )?
Andrews [41]

Answer: 167.2 J

Explanation:

5 0
2 years ago
Other questions:
  • How many electrons in an atom could have these sets of quantum numbers?
    14·1 answer
  • What element is in the 3 rd period and 7th family
    13·2 answers
  • 6. How does temperature relate to the layers of the atmosphere?
    11·1 answer
  • A 0.085 M solution of a weak acid has a pH of 2.68. Determine the Ka value for this acid.
    6·1 answer
  • What is the scientific name of lion
    8·2 answers
  • What are the most common metric units used in science?
    12·1 answer
  • PLZZ HELP QUICK WORTH 20 POINTS IM NOT JOKING PLZZZ
    14·2 answers
  • At a certain temperature, O2 molecules move at an average velocity of 480 m/s. At that same temperature what would be the veloci
    15·1 answer
  • Which of the following methods of making electricity results in dangerous radioactive waste
    9·1 answer
  • Question 9 (1 point)
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!