Answer: gradual increase in temperature of ice from −15°C to 0°C, holding at 0°C as ice melts to water
Explanation: The heat used to convert solid to liquid is gained by molecules to gain kinetic energy and thus the molecules start moving faster and the temperature increases.
But as the melting point is approached i.e.
, the temperature remains constant as now the heat given is used to break the inter molecular forces and thus is not reflected in terms of temperature increase. This hidden heat is called as latent heat.
The temperature remains constant till the phase change is complete.
Explanation:
Gravitational potential energy
= mgh = (45kg)(9.81N/kg)(2m) = 882J.
Al =2
Cl =1
O=5
H=5
is this wt u need ??
Answer:
B) Tammi has a comparative advantage in both tasks.
Explanation:
Based on the information provided in the question, Horace does not have the total advantage in the grooming of dogs as well as the bathing of cats due to the opportunity cost. On the other hand, Tammi has the total advantage of the bathing of cats as well as the grooming of dogs due to the opportunity cost. Therefore, the correct option is option B.
Answer:
755.625 kj
Explanation:
Given data:
Heat released by two mole of H₂ = 241.8 Kj
Heat released by 12.5 grams of H₂ = ?
Solution:
Number of moles of hydrogen:
Number of moles = mass/ molar mass
Number of moles = 12.5 g/ 2 g/mol
Number of moles = 6.25 mol
Chemical equation:
2H₂ + O₂ → 2H₂O + 241.8 kj
Now we will determine the heat released by 6.25 moles of hydrogen.
2 mole = 241.8 kj
1 mole =241.8 kj/2 = 120.9 kj
120.9 kj × 6.25 = 755.625 kj