Ammonia gas will have a mass of 3.17grams.
HOW TO CALCULATE MASS:
- The mass of a substance can be calculated by multiplying the number of moles in the substance by its molar mass.
- However, to calculate the number of moles present in the ammonia gas given in this question, we use the formula as follows:
where;
- P = pressure (atm)
- V = volume (L)
- n = number of moles (mol)
- R = gas law constant
- T = temperature
n = PV ÷ RT
n = (1.2 × 3.7) ÷ (0.0821 × 290)
n = 4.44 ÷ 23.81
n = 0.186mol
- Mass of ammonia gas = 3.17g
- Therefore, the mass of ammonia gas is 3.17grams.
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A, B, and C because they all equal 5.6 cm and it’s not close to 6.
Answer:
- 0.674 kJ.
Explanation:
The equation used to solve this problem is:
Q = mCΔT
where,
Q = amount of heat
m = mass of the substance
C = specific heat capacity
ΔT = change in temperature
= Temp.f - Temp.i
Given:
m = 29.2 g
Temp.i = 79°C
Temp.f = 27°C
Cp(iron) = 0.444 J/g.K
Q = mCΔT
ΔT = 27.0°C - 79.0°C
= -52°C
= 29.2 * 0.444 * -52
Q = - 674.17 J
= 0.674 kJ.
Heat of Fusion is defined as the energy required to turn a liquid into a solid, or said phase changing latent heat. In this case the only choice that represents that phase change is (1). Where the heat removed to turn a liquid of a substance into it's solid form is instead added to excite the bonds and liquify it. Yet, heat of fusion (s) ->(l)
is still the same as going from liquid to solid just one is adding and the other is removing, respectively.
