In order to determine if the ion is positively charged or negatively charged
From the periodic table:
mass of carbon = 12 grams/mole
mass of hydrogen = 1 gram/mole
mass of oxygen = 16 grams/mole
The given compound C₆H₁₂O₆ has 6 moles of carbon, 12 moles of hydrogen and 6 moles of oxygen.
Therefore, the molar mass of the given compound will be calculated as follows:
molar mass = 6(12) + 12(1) + 6(16) = 180 grams/mole
What is the amount of heat, in joules, required to increase the temperature of a 49.5-gram sample of water from 22°C to 66°C?
- (1) 9100 J
- (2) 4600 J
- (3) 1400 J
- (4) 2300 J
<u>Answer:</u>
9100 J is the amount of heat, in joules, required to increase the temperature of a 49.5-gram sample of water from 22°C to 66°C.
<u>Explanation:</u>
Given: Q = ? J
mass = 49.5 g = 0.0495 kg
T1 = 22°C
T2 = 66°C
Cp = 4.18 J/Kg°C
Q = mCpΔT
Q = (4.95)(4.18)(66 - 22)
Q = 9104 J
So 9100 J is the amount of heat, in joules, required to increase the temperature of a 49.5-gram sample of water from 22°C to 66°C.
Answer:
B, wax melting
Explanation:
When wax melts, the form of matter is the only thing that changes. Wax in this case goes from a solid to a liquid, and this process can be reversed when it cools. Hence labeling it a physical change instead.
