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3 years ago

HELP ASAP

Chemistry

2 answers:

emmainna [20.7K]3 years ago

8 0

Answer:

Explanation:

Hurricane category numbers, from 1-5, are based off of what wind speed the hurricane is. Each category has a certain wind speed number that the hurricane must be in for it to qualify.

sveta [45]3 years ago

3 0

Uhh I think d sorry if wrong ;-;

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Consider the reactionI2(g) + Cl2(g)2ICl(g)Using standard thermodynamic data at 298K, calculate the entropy change for the surrou

Georgia [21]

We know,

$\Delta H_{I_2(g)}=62.438\ KJ/mol\\\\\Delta H_{Cl_2(g)}= 0.0\ KJ/mol\\\\\Delta H_{ICl(g)}=17.78\ KJ/mol$

For given reaction, $I_2(g)+Cl_2(g)\ -->\ 2ICl(g)$

$\Delta H_{rxn}=2\Delta H_{ICl(g)}-\Delta H_{I_2(g)}-\Delta H_{Cl_2(g)}\\\\\Delta H_{rxn}=2(17.78)-0-62.438\ KJ/mol\\\\\Delta H_{rxn}=-26.878\ KJ/mol$

For , 2.41 moles of $I_2$ :

$\Delta H_{rxn}=2.41\times (-26.878)\ KJ\\\\\Delta H_{rxn}=-64.78\ KJ$

We know :

$\Delta S = -\dfrac{\Delta H_{rxn}}{T}\\\\\Delta S = -\dfrac{-64.78}{298}\ KJ/K\\\\\Delta S =-0.21738 \ KJ/K\\\\\Delta S=-217.38\ J/K$

Hence, this is the required solution.

7 0

4 years ago

The Al2O3 crystal structure (corundum) consists of an HCP arrangement of O2- ions; the Al3+ ions occupy octahedral positions. Wh

vesna_86 [32]

Answer:

The fraction of the available octahedral positions are filled with $Al^{3+}$ ions is $\frac{2}{3}$

Explanation:

If there are n numbers of spheres in HCP in packing:

Number of octahedral void = n

Number of tetrahedral void = 2n

Total number of voids = n + 2n = 3n

The $Al_2O_3$ crystal structure consists of an HCP arrangement of $O^{2-}$ ions.

Number of spheres in HCP = 6

Number of $O^{2-}$ = 6

Number of octahedral voids = 6

Number of tetrahedral void = 12

Number of aluminum ions when there are 6 $O^{2-}$ ion = $\frac{2}{3}\times 6= 4$

Number of voids in which $Al^3+$ ions are present = 4

The fraction of the available octahedral positions are filled with $Al^{3+}$ ions = $\frac{4}{6}=\frac{2}{3}$

5 0

4 years ago

What functional feature(s) does the phosphate group contribute to the structure of a phospholipid? select all that apply. select

bezimeni [28]

A phospholipid structure is shown in the picture attached. It has three parts: the hydrophobic tail, the hydrophilic head and the phosphate group in the center. Thus, the function of the phosphate group is to link the hydrophobic and hydrophilic parts of a phospholipid. Specifically, the phosphate group is part of the hydrophilic head. So, it is used to connect the phospholipids to polar compounds.

5 0

3 years ago

study the electron dot diagrams in figure 1 above. which two elements are most likely to react and form a compound what type of

azamat

There’s no picture? regardless, if there are two numbers of electrons adding up to 8, then they will likely form an ionic bond/compound. if they can form a covalent bond with whatever amount of electrons, ex carbon 4 and 4, then it would b covalent compound

8 0

3 years ago

Read 2 more answers

What is the molar mass of BaBr2? A. 217.2 g/mol B. 297.1 g/mol C. 354.5 g/mol D. 434.4 g/mol

qaws [65]

Answer: Option (B) is the correct answer.

Explanation:

Molar mass is defined as the sum of masses of all the atoms present in a compound.

For example, atomic mass of barium is 137.32 g/mol and atomic mass of bromine is 79.90 g/mol.

Therefore, molar mass of $BaBr_{2}$ will be as follows.