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Musya8 [376]
3 years ago
6

Which one of this is endothermic and which one is exothermic?

Chemistry
1 answer:
pickupchik [31]3 years ago
7 0
The first one is exothermic because energy is a reactant, the second formula is endothermic
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The balloon Spirit of Freedom, flown around the world by American Steve Fossett in 2002, contained 550,000 cubic feet of helium.
Elodia [21]
Assuming the balloon initially has volume of 0 when deflated, the total P(deltaV) = (1.00 atm)(550,000 ft^3) = 550,000 atm-ft^3. To convert into work units, we can first convert ft^3 to L:
(550,000 atm-ft^3)(1 m/3.28 ft)^3
= (15,586.2 atm-m^3)
Then we convert to L:
(15,586.2 atm-m^3)(1000 L/m^3)
= 15,586,200 atm-L
Then we convert to J:
(15,586,200 atm-L)(101.325 J / 1 atm-L)
= 1.579 x 10^9 J
3 0
3 years ago
How might someone dispute the results of your investigation? How might you counter the argument?
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Someone may think the results are wrong you can fight with them through words or the use of hands in which you can toss them
5 0
2 years ago
Calculate the molar mass of a gaseous substance if 0.125 g of the gas occupies 93.3 mL at STP.
just olya [345]

Answer:

30.0g/mol

Explanation:

Step 1: Given data

  • Mass of the gas: 0.125 g
  • Pressure (P): 1 atm (standard pressure)
  • Temperature (T): 273.15 K (standard temperature)
  • Volume (V): 93.3 mL

Step 2: Calculate the moles of the gas

We will use the ideal gas equation.

P \times V = n \times R \times T\\n = \frac{P \times V}{R \times T} = \frac{1atm \times 0.0933L}{\frac{0.0821atm.L}{mol.K}  \times 273.15K} = 4.16 \times 10^{-3} mol

Step 3: Calculate the molar mass of the gas

4.16 × 10⁻³ moles correspond to a mass of 0.125 g. The molar mass of the gas is:

\frac{0.125g}{4.16 \times 10^{-3} mol} =30.0g/mol

7 0
3 years ago
What occurs when a reaction reaches equilibrium?
lara31 [8.8K]

Answer:

3)The rate of the forward reaction is equal to the rate of the reverse reaction

4 0
2 years ago
Read 2 more answers
Consider the sulfur difluoridemolecule.What is the central atom? Enter its chemical symbol.How many lone pairs are around the ce
olchik [2.2K]

Answer:

a. The central atom is sulfur

b. SF2

c. The central atom has two lone pairs

d. The ideal angle between the sulfur-fluorine bonds is 109.5°

e.  I expect the actual angle between the sulfur-fluorine bonds to be less than 109.5° because unbonded pairs repel bonded pairs more than bonded pairs repel other bonded pairs. So the bonds here will be pushed closer than normal

8 0
3 years ago
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