Answer:

Explanation:
When water changes from ice (solid) to water (liquid), it is melting or fusion. Therefore, we can use the following formula to find energy:

where <em>q</em> is the energy, <em>m </em>is the mass, and <em>Hf</em> is the heat of fusion.
1. Define Values
The mass is 150 grams. The heat of fusion for water is 334 Joules per gram.

2. Calculate Energy
Substitute the values into the formula.

Multiply. Note that the grams (g) will cancel each other out and leave Joules as our units.


3. Convert Units
We found the answer in joules, but the question asks for kilojoules, so we must convert.
There are 1000 Joules in 1 kilojoule. Therefore, we can divide the joules calculated by 1000.



<u>50.1 kilojoules </u>are needed to change 150 grams of ice to water.
Answer: 159.61 g/mol
Copper has a molar mass of 63.546 g/mol
Sulfur has a molar mass of 32.065 g/mol
Oxygen has a molar mass of 16 g/mol, multiply by 4 and it is 16 x 4 = 64 g/mol
63.546 + 32.065 + 64 = 159.61 g/mol
Answer:
Wavelength of Radio wave = 10² meter = 100 meters, frequency 10 power 6 htz,
Wavelength of gamma ray = 10 power -12 meters = 0.000000000002 meters, frequency 10 power 20 htz
frequenc
Explanation:
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