Please help me with this question number 22

Answers

Answer 1

Answer: If I remember correctly 1 Cal (capital C) is equal to 1000 cal (lower case c) where Cal is used in nutrition since 1 cal is actually relatively small. If I am write about that, the answer should be 138Cal (nutritional calories) equals 138000cal. Therefore I think the answer is 138000cal.

I hope this helps. Let me know in the comments if anything is unclear.

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Determine the number of protons and neutrons in an isotope of bromine (br) with a mass number/atomic mass of 79. (the atomic number of bromine is 35.)

Which of the following aqueous solutions will have the lowest vapor pressure at 25 degrees Celsius?a. 1.0 M CH4
b. 1.0 M NaCl
c. 1.0 M AlCl3
d. 1.0 M BaCl2

Answers

The choices experiences colligative properties. These set of properties depend on the amount of solute dissolved in a solvent. These properties include freezing point depression, boiling point elevation, osmotic pressure and vapor pressure lowering. From the choices, the correct answer is A.

Answer : The correct option is, (C) 1.0 M $AlCl_3$

Explanation :

According to the relative lowering of vapor pressure, the vapor pressure of a component at a given temperature is equal to the mole fraction of that component of the solution multiplied by the vapor pressure of that component in the pure state.

1.0 M means that the 1.0 moles of solute present in 1 liter of solution.

Formula used :

$(\Delta p)/(p^o)=i* X_B$

where,

$p^o$ = vapor pressure of the pure component (water)

$p_s$ = vapor pressure of the solution

$X_B$ = mole fraction of solute

i = Van't Hoff factor

As we know that the vapor pressure depends on the mole fraction of solute and the Van't Hoff factor.

So, the greater the number of particles of solute dissolved the lower the resultant vapor pressure.

(a) The dissociation of 1.0 M $CH_4$ is not possible because it is a non-electrolyte solute. So, the Van't Hoff factor will be, 1.

(b) The dissociation of 1.0 M $NaCl$ will be,

$NaCl\rightarrow Na^++Cl^-$

So, Van't Hoff factor = Number of solute particles = $Na^++Cl^-$ = 1 + 1 = 2

(c) The dissociation of 1.0 M $AlCl_3$ will be,

$AlCl_3\rightarrow Al^(3+)+3Cl^(-)$

So, Van't Hoff factor = Number of solute particles = $Al^(3+)+3Cl^(-)$ = 1 + 3 = 4

(c) The dissociation of 1.0 M $BaCl_2$ will be,

$BaCl_2\rightarrow Ba^(2+)+2Cl^(-)$

So, Van't Hoff factor = Number of solute particles = $Ba^(2+)+2Cl^(-)$ = 1 + 2 = 3

From this we conclude that, 1.0 M $AlCl_3$ has the highest Van't Hoff factor which means that the solution will exhibit the lowest vapor pressure.

Hence, the correct option is, (C) 1.0 M $AlCl_3$

How does a prokaryotic cell know how to reproduce? A The instructions necessary are found in the nucleoid. B A hormone is released that prompts a mature cell to mate. C An enzyme reacts with the cytoplasm to create two cells from one. D The DNA in the nucleus provides the instructions to the cell.

Answers

D. The nucleus provides instructions to all organelles in the cell

In the mid-1900s, most scientists used the Bohr atomic model to study atoms. In the Bohr model, electrons move in set paths around the atom's nucleus.In current atomic models, electron clouds are shown around the atom's nucleus. Electron clouds are regions where electrons are likely to be found.

What is a limitation of current atomic models as compared to the Bohr atomic model?

A. Current atomic models do not indicate the position of the nucleus within the atom's structure.

B. Current atomic models do not show how many electrons an atom has.

C. Current atomic models do not show where the electron is but only where the electron is likely to be.

Answers

the answer is c beca it true

Answer:

The answer is C.

Explanation:

6X, Y and Z are all gases that behave ideally and react according to the equation shown.
X(g) + 2Y(g) → 2Z(9)
When 3.0 mol of X and 3.0 mol of Y are placed inside a container with a volume of 1.0 dmº, they
react to form the maximum amount of Z.
The final temperature of the reaction vessel is 120°C.
What is the final pressure inside the reaction vessel?
А
4.49 x 10 Pa
B
9.80 x 106 Pa
C
1.47 x 10' Pa
D
1.96 x 10' Pa

Answers

Answer:

Explanation:

PV=nRT

n=nx + my

n=3mol+3mol

n=6mol

T=120+273=393K

P=nRT/V

P=6×0.0821×393/1

P=193atm

1atm=1.01325×10^5Pa

193atm=xPa

x=1.96×10^7Pa

Which of the following has a positive enthalpy without a temperature change? condensing gas

evaporating a liquid

cooling a solid

cooling a liquid

Answers

A cooling solid because a cooling liquid would turn into a solid

i think the answer is cooling a liquid

Which begins as radiant energy and can be transformed into electricity? A.
water

B.
uranium

C.
sunlight

D.
wind

Answers

A. water. hope i helped

A. water is the most likly choice for the answer

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