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
tekilochka [14]
2 years ago
7

Given that cao(s) + h2o(l) → ca(oh)2(s), δh°rxn = –64.8 kj/mol, how many grams of cao must react in order to liberate 525 kj of

heat?
Chemistry
1 answer:
USPshnik [31]2 years ago
8 0

Answer:

454.3 g.

Explanation:

  • From the given data:

1.0 mol of CaO liberates → – 64.8 kJ.

??? mol of CaO liberates → - 525  kJ.

∴ The no. of moles needed = (1.0 mol)(- 525 kJ)/(- 64.8 kJ) = 8.1 mol.

<em>∴ The no. of grams of CaO needed = no. of moles x molar mass</em> = (8.1 mol)(56.077 g/mol) = <em>454.3 g.</em>

You might be interested in
Which organ gives our body the sense to touch, protects it, and helps keep it at the right temperature?
Tomtit [17]
The answer is A) skin
7 0
3 years ago
Read 2 more answers
How does sodium become a negative ion of neon
Svetlanka [38]
I don’t know if this works

8 0
3 years ago
Give the chemical formula and systematic name for aurous sulfide, which is named using the older nomenclature. spelling counts!
Bingel [31]
Aurous is a cation of gold. Gold takes the name "aurum" (Au) with atomic number of 79. In its purest form, the element is bright, slightly yellow, soft, ductile, and malleable. The charge of aurous is +1. Sulfide, on the other hand, has a charge of -2. 

Hence, the chemical formula of the compound is Au₂S and its systematic name is gold (I) sulfide. 
5 0
3 years ago
Setting up a one-step unit conversion A student sets up the following equation to convert a measurement. (The ? stands for a num
Aneli [31]

Answer:

0.0008 m

Explanation:

We are given that 0.080 cm

We have to convert 0.080 cm into meter

To find the value of 0.080 cm in meter we are using unitary method

We know that

100 cm =1 m

1 cm =\frac{1}{100} m

Therefore, 0.080 cm =\frac{1}{100}\times 0.080 m

0.080 cm =\frac{1}{100}\times \frac{80}{1000}m

0.080 cm =\frac{8}{10000}m

0.08cm=0.0008 m

Hence, the value of 0.080 cm is equal to 0.0008 meter .

7 0
2 years ago
Determine the approximate amount of potassium hydrogen phthalate, KHP, that you will need to neutralize 6.00 ml of 0.100 M NaOH.
Sveta_85 [38]

Answer:

potassium hydrogen phthalate KHP MOLAR MASS = 204.233 glmol

to get 1000 ml

Molar concentration = Mass concentration/Molar Mass

mass concentration = molar concentration x molar mass

mass concentration=0.1 M,

molar mass= 204.233 g/mol

so to get 1L

mass conc = 204.233 x 0.1

= 20.4233g  for 1L or 1000 ml

to get 6.00 ml

if 20.4233g is for 1000ml

then to 6.00 ml

= 20.4233 x 6 / 1000

= 0.123g for 6.00 ml

according to the equation below

NaOH(aq) + KHC8H4O4(aq) --> KNaC8H4O4(aq) + H2O(l)

number of moles of NaOH is equal to that of KHP

so the same amount will be needed too, which is

= 0.123g

6 0
2 years ago
Other questions:
  • How does a plants food translate to plant growth (hint: energy is needed for growth)?
    9·1 answer
  • When writing the electron configuration for an element in the d block you have to remember to lower the energy level by 1. 
    15·1 answer
  • Which of the units is NOT a measure of pressure ?
    8·1 answer
  • Question 1
    10·1 answer
  • SOMEONE PLEASE HELP ME!
    14·1 answer
  • In general which way does wind blow
    12·1 answer
  • In a particular genetic cross, the probability of the offspring having a certain traitis 3/4
    9·2 answers
  • An ideal gas is contained in a cylinder with a volume of 5.0×102 mL at a temperature of 30. ºC and a pressure of 710. torr. The
    5·1 answer
  • When metals combine with non metals , the metallic atom tend to
    6·1 answer
  • Balance the chemical equation. ___Mg + ___Fe2O^3 -&gt; ___MgO + ___Fe
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!