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loris [4]
3 years ago
6

What was the name of yesterday's supermoon​

Chemistry
1 answer:
MrRa [10]3 years ago
5 0

Answer: May's full moon or Flower moon

Explanation:

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Protons have about the same mass as:<br> A. electrons<br> B. neutrons<br> C. plasma particles
Andrews [41]
Protons have the same mass as B. Neutrons. They have almost the same exact mass.
3 0
3 years ago
Flag this question question 8 10 pts use the δh°f and δh°rxn information provided to calculate δh°f for if: δh°f (kj/mol) if7(g)
GarryVolchara [31]

\Delta H\textdegree{}_f(\text{IF} \; (g)} = -95 \;  \text{kJ} \cdot \text{mol}^{-1}

Explanation

\text{IF}_7 \; (g) + \text{I}_2 \; (s) \to \text{IF}_5 \; (g) + 2\; \text{IF} \; (g)

  • \Delta H\textdegree{}_\text{rxn} = -89\; \text{kJ} \cdot \text{mol}^{-1}
  • \Delta H\textdegree{}_f (\text{IF}_7 \; (g) ) = -941 \; \text{kJ} \cdot \text{mol}^{-1} (from the question)
  • \Delta H\textdegree{}_f (\text{IF}_5 \; (g) ) = -840 \; \text{kJ} \cdot \text{mol}^{-1} (from the question)
  • As an the most stable allotrope under standard conditions, \Delta H\textdegree{}_f (\text{I}_2) = 0\; \text{kJ} \cdot \text{mol}^{-1}

By definition,

\Delta H\textdegree{}_\text{rxn} = \Delta H\textdegree{}_f (\text{all products})  - \Delta H\textdegree{}_f (\text{all reactants})

\Delta H\textdegree{}_f (\text{IF}_5 \; (g) ) + 2 \;  \Delta H\textdegree{}_f (\text{IF} \; (g) ) - \Delta H\textdegree{}_f (\text{IF}_7 \; (g) )  - \Delta H\textdegree{}_f (\text{I}_2 \; (s) ) \\  =  \Delta H\textdegree{}_{\text{rxn}}

\begin{array}{ccc} \Delta H\textdegree{}_f  (\text{IF} \; (g) )& = & 1/2\; ( \Delta H\textdegree{}_{\text{rxn}} - \Delta H\textdegree{}_f (\text{IF}_5 \; (g) ) + \Delta H\textdegree{}_f (\text{IF}_7 \; (g) )  + \Delta H\textdegree{}_f (\text{I}_2 \; (s) ) )\\ & = & 1/2 \; (-89 - (-840) + (-941))}\\ & = & - 95 \; \text{kJ} \cdot \text{mol}^{-1} \end{array}

Note, that iodine on the reactant side is stated as a gas in the equation given in the question whereas under standard conditions it is expected to be under the solid state; the \Delta H\textdegree{} _f given in the question seemingly corresponds to the one in which the reactant iodine exists as a solid rather than as a gas. Evaluating the last expression using data from an external source

\Delta H\textdegree{}_f (\text{I}_2 \; (g) ) = \Delta H\textdegree{}_f(\text{I}_2 \; (s)) + \Delta H\textdegree{}_{\text{sublimation}}(\text{I}_2) = 62.42 \;  \text{kJ} \cdot \text{mol}^{-1} (Cox, Wagman, et al., 1984)

... yields \Delta H\textdegree{}_f  (\text{IF} \; (g) )  \approx -64 \; \text{kJ}\cdot \text{mol}^{-1}, which deviates significantly from the experimental value of -94.76    \; \text{kJ}\cdot \text{mol}^{-1} (Chase, 1998.) It is thus assumed that the \Delta H\textdegree{}_\text{rxn} value provided requires a reaction with \text{I}_2 \; (s) rather than \text{I}_2 \; (g) as a reactant.

3 0
3 years ago
what is the molarity of a solution made by dissolving 18.5 grams of NaCL into enough water to reach 450.0ML​
ValentinkaMS [17]

Answer:

0.702M

Explanation:

Molarity of a solution, which refers to the molar concentration of that solution can be calculated thus;

Molarity = number of moles (n) ÷ volume (V)

Firstly, we convert 18.5 grams of NaCl to moles using the formula; mole = mass/molar mass

molar mass of NaCl = 23 + 35.5 = 58.5g/mol

mole = 18.5/58.5

mole = 0.32moles

Volume of water (V) = 450mL = 450/1000 = 0.450L

Molarity = n/V

Molarity = 0.32/0.450

Molarity = 0.702M

4 0
3 years ago
(Al = 27.0 g, O = 16.0 g, H = 1.0 g)
nadya68 [22]

Answer:

Explanation:

21

4 0
2 years ago
The gas in a 350 mL balloon has a pressure of 0.85 atm. If the temperature remains constant, what will be the pressure of the ga
Lina20 [59]

Answer:

<h2>0.66 atm </h2>

Explanation:

The new pressure can be found by using the formula for Boyle's law which is

P_1V_1 = P_2V_2

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we're finding the new pressure

P_2 =  \frac{P_1V_1}{V_2}  \\

We have

P_2  =  \frac{350 \times 0.85}{450}  =  \frac{297.5}{450}  \\  = 0.661111...

We have the final answer as

<h3>0.66 atm</h3>

Hope this helps you

8 0
3 years ago
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