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
atroni [7]
3 years ago
8

The molar heat of fusion of platinum (Pt) is 4.700 kcal/mol. How much heat must be added to 85.5 g of solid platinum at its melt

ing point to completely melt it?
Chemistry
2 answers:
Zolol [24]3 years ago
6 0
The answer is 2.06 kcal
Andre45 [30]3 years ago
4 0
The heat required to completely melt the given substance, platinum, we just have to convert first the given mass in mole and multiply the answer to its molar heat of fusion.. 
                              Hf  = mass x (1/molar mass) x molar heat of fusion
                            Hf = (85.5 g) x (1 mole/195.08 g) x 4.70 kcal/mol
                                   Hf = 2.06 kcal
You might be interested in
The theoretical yield of a reaction is the amount of product obtained if the limiting reactant is completely converted to produc
Elis [28]

Answer: 9.9 grams

Explanation:

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}

a) moles of H_2

\text{Number of moles}=\frac{8.150g}{2g/mol}=4.08moles

b) moles of C_2H_4

\text{Number of moles}=\frac{9.330g}{28g/mol}=0.33moles

H_2(g)+C_2H_4(g)\rightarrow C_2H_6(g)

According to stoichiometry :

1 mole of C_2H_4 combine with 1 mole of H_2

Thus 0.33 mole of C_2H_4 will combine with =\frac{1}{1}\times 0.33=0.33 mole of H_2

Thus C_2H_4 is the limiting reagent as it limits the formation of product.

As 1 mole of C_2H_4 give =  1 mole of C_2H_6

Thus 0.33 moles of C_2H_4 give =\frac{1}{1}\times 0.33=0.33moles  of C_2H_6

Mass of C_2H_6=moles\times {\text {Molar mass}}=0.33moles\times 30g/mol=9.9g

Thus theoretical yield (g) of C_2H_6 produced by the reaction is 9.9 grams

7 0
3 years ago
How many moles of solute are contained in 3.0 L of a 1.5 M solution? Helppp pleaseee
Art [367]
4.5 moles! I hope my answer helps
8 0
3 years ago
Under what pressure did 10L of gas change to if the original pressure was 4 atm on 3L?​
cluponka [151]

Answer:

11111

Explanation:

1110001001

3 0
3 years ago
What is the mass of 4.2kg gold when it's transferred to a planet having twice the gravity of earth
rjkz [21]

Answer:

The only relationship is that the larger the mass of an object the more gravitational force it has. So... something that has more mass has more gravity. The mass of 4.2kg of gold when transferred to this new planet is still 4.2kg. However, the WEIGHT (not mass) is now doubled to 8.4kg. Mass is constant it is how much matter something is made up of. Weight depends on the gravitational force. Moreover, I would look at other answers too (I'm not entirely confident of saying that the weight is 8.4kg since I don't have any gravitational equations in front of me it just sounds logical).

Explanation:

5 0
3 years ago
What kind of elements do not give, receive or share electrons?
galina1969 [7]
The group of elements on the periodic table that does not participate in chemical bonding at all would be the noble gas elements. These either do not give, receive, and or share electrons.
6 0
3 years ago
Other questions:
  • 3 Na2O(aq) + 2 Al(NO3)3(aq) ----> _ Compound A + _ Compound B
    8·1 answer
  • Why does metal need to be extracted from an ore before it can be used?
    11·1 answer
  • What is formed from joining<br> positive and<br> negative ions
    14·1 answer
  • Which of the following best describes the impact of glaciers upon the surface of the earth?
    14·1 answer
  • 1. You return to the car from an all-day shopping spree at the mall.
    11·1 answer
  • Microwave ovens emit microwave energy with a wavelength of 12.8 cm. What is the energy of exactly one photon of this microwave r
    8·2 answers
  • When molten candle wax solidifies is that a chemical reaction or not?l
    10·1 answer
  • 2. As elements go down a group, they have a whole
    11·1 answer
  • Explain why a random copolymer is obtained when 3,3-dimethyl-1-butene undergoes cationic polymerization.
    7·1 answer
  • Please help! its due at the end of class.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!