How do you balance H2SO4 + B(OH)3 --> B2(SO4)3 + H2O

Answers

Answer 1

Answer: $B(OH)_3=H_3BO_3$

then

$H_2SO_4+H_3BO_3\longrightarrow~B_2(SO_4)_3+H_2O$

$\boxed{3H_2SO_4+2H_3BO_3\longrightarrow~B_2(SO_4)_3+6H_2O}$

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What Kelvin temperature is equal to -33DC? A) 306K B) -33K C) 240K D) 33K

Answers

Final Answer:

$\boxed{\boxed{\huge\textsf{$\rm -33^(\,\circ)C=240.15\,K$}}}$

Kelvin Absolute Temperature:

The kelvin, symbol K, is a unit of measurement for temperature. The Kelvin scale is an absolute scale, which is defined such that 0 K is absolute zero, the lowest temperature possible on Earth.

Historically developed from the Celsius scale, the conversion is thus:

$\boxed{\Large\textsf{$\rm 0^(\,\circ)C=273.15\,K$}}$

And absolute zero, 0 K = -273.15° C, the lowest temperature possible.

Knowing this, we can solve the question as:

$\Large\textsf{$\rm -33^(\,\circ)C=(-33+273.15)\,K$}\n\n\boxed{\boxed{\Large\textsf{$\therefore\rm -33^(\,\circ)C=240.15\,K$}}}$

$\hrulefill$

To learn more about the Kelvin Absolute Temperature Scale:

brainly.com/question/24652526

1 ℃ = 273.15 K.

The Kelvin temperature equal to -33℃ is 240 K.

Compared to the freezing point of 1.0 M KCl(aq) at standard pressure, the freezing point of 1.0 M CaCl2(aq) at standard pressure is(1) lower
(2) higher
(3) the same

Answers

Answer : The correct option is, (1) lower

Explanation :

Formula used for lowering in freezing point :

$\Delta T_f=i* k_f* m$

where,

$\DeltaT_b$ = change in freezing point

$k_b$ = freezing point constant

m = molality

i = Van't Hoff factor

According to the question, we conclude that the molality of the given solutions are the same. So, the freezing point depends only on the Van't Hoff factor.

Now we have to calculate the Van't Hoff factor for the given solutions.

(a) The dissociation of $KCl$ will be,

$KCl\rightarrow K^++Cl^-$

So, Van't Hoff factor = Number of solute particles = 1 + 1 = 2

(b) The dissociation of $CaCl_2$ will be,

$CaCl_2\rightarrow Ca^(2+)+2Cl^-$

So, Van't Hoff factor = Number of solute particles = 1 + 2 = 3

The freezing point depends only on the Van't Hoff factor. That means higher the Van't Hoff factor, lower will be the freezing point and vice-versa.

Thus, compared to the freezing point of 1.0 M $KCl(aq)$ at standard pressure, the freezing point of 1.0 M $CaCl_2(aq)$ at standard pressure is lower.

An experiment requires 40.0g of ethylene glycol, a liquid whose density is 1.114 g/mL. Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What volume of the liquid should he use?

Answers

Density= mass/volume
volume=mass/density
volume= 40.0g/1.114g per mL
volume= 35.90664273 mL
volume = 35.9 mL

The atomic masses in the Periodic Table are not integral numbers. For example, carbon is listed as 12.011 amu instead of 12.000 amu. Why?

Answers

The reason that the atomic masses shown on the periodic table include fractions, is to account for the other isotopes of the element, not just the pure element. Remember, an isotope is a atom of an element with a reduced or increased number of neutrons. This changes the atomic mass but not the charge. The number is calculated by multiplying the atomic mass of each isotope of the element with its percent abundance found in nature. Therefore it is an averaged atomic mass for all of the element. For example, carbon-12 may (I don't know the real numbers) have a % abundance of 98.5%, and carbon-14 may have a percent abundance of 1.5%, so that is why carbon would have an atomic mass greater than 12.000.

What happens to a water bottle in a freezer and why

Answers

the water well begin to freeze and turn into soild. why? because the temperature of the the freezer is getting the water bottle cold so when that cold temperature hits that that bottle which has liquid in it so you should know that when liquid is into cold air it well so be soild so when you put the water bottle in the freezer it will be soild.
and also remember gas - liquid - soild gas change to liquid by hot air and liuid change to soild by clod air
hoped i helped

What material would be the best choice for the support beams of a building

Answers

Answer:

Steel.

Explanation:

Hello,

Based on the high breaking down, corrosion and shearing resistance steel has, it is by far the best option to be chosen in order to support the beams in a building.

Best regards.

Steel would be the best choice for support beams

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