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3 years ago

98 POINTS! MUST SHOW WORK for Brainliest!

Chemistry

2 answers:

Gnoma [55]3 years ago

8 0

ans is B) 2 moles of CH₄

because it has 4 Hydrogen atoms per molecule, 1 more than NH3 has.

xxTIMURxx [149]3 years ago

5 0

B. because the little number below the H stands for how many atoms there are, and b has 1 more Hydrogen atom than A does.

(I think)

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What is the concentration of OH − and pOH in a 0.00066 M solution of Ba ( OH ) 2 at 25 ∘ C? Assume complete dissociation.

Allushta [10]

<u>Answer:</u> The hydroxide ion concentration and pOH of the solution is $1.32\times 10^{-3}M$ and 2.88 respectively

<u>Explanation:</u>

We are given:

Concentration of barium hydroxide = 0.00066 M

The chemical equation for the dissociation of barium hydroxide follows:

$Ba(OH)_2\rightarrow Ba^{2+}+2OH^-$

1 mole of barium hydroxide produces 1 mole of barium ions and 2 moles of hydroxide ions

pOH is defined as the negative logarithm of hydroxide ion concentration present in the solution

To calculate pOH of the solution, we use the equation:

$pOH=-\log[OH^-]$

We are given:

$[OH^-]=(2\times 0.00066)=1.32\times 10^{-3}M$

Putting values in above equation, we get:

$pOH=-\log(1.32\times 10^{-3})\\\\pOH=2.88$

Hence, the hydroxide ion concentration and pOH of the solution is $1.32\times 10^{-3}M$ and 2.88 respectively

3 0

3 years ago

A 8.249 gram sample of copper is heated in the presence of excess fluorine. A metal fluoride is formed with a mass of 13.18 g. D

levacccp [35]

Answer:

$CuF_2$ the empirical formula of the metal fluoride.

Explanation:

Mass of copper heated = 8.249 g

Mass of copper fluoride formed = 13.18 g

Mass of fluorine gas in copper fluoride = x

$13.18 g = 8.249 g + x\\x= 13.18 - 8.249 g = 4.931 g$

Moles of copper :

$= \frac{8.249 g}{63.546 g/mol}=0.1298 mol$

Moles of fluorine:

$= \frac{4.931 g}{18.998 g/mol}=0.2596 mol$

For the empirical formula divide the smallest mole of an element with all the moles of elements present in the compound.

$Copper= \frac{0.1298 mol}{0.1298 mol}=1\\Fluorine = \frac{0.2596 mol}{0.1298 mol}=2$

The empirical formula of the copper fluoride = $CuF_2$

$CuF_2$ the empirical formula of the metal fluoride.

6 0

3 years ago

Which of the following is the correct definition of convection?

kvv77 [185]

Answer: A. the transfer of heat by currents

Explanation: There are three modes of heat transfer:

1) Conduction: This type of heat transfer happens when there is direct contact between the two object. Example: heating a pan on stove.

2) Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas) due to the movement of hot layers to the top and cold layers to the bottom which leads to convection currents. Example: Heating of swimming pool.

3) Radiation: This type of heat transfer happens when there is direct transfer of energy through space. Example: Heating of earth's surface.

B. The transmission of heat across matter is conduction.

C. The electromagnetic radiation from the surface of an object which is due to the object's temperature is radiation.

D. The transmission of heat across empty space is radiation.

3 0

3 years ago

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What is the appearance of H2o?

telo118 [61]

Answer:

Water

Explanation:

one molecule of water has two hydrogen atoms covalently bonded to a single oxygen atom. Water is a tasteless, odorless liquid at ambient temperature and pressure. Which is known to be crystal blue.

6 0

3 years ago

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Is PCl3 ionic or covalent?

mote1985 [20]

Answer:

covalent

Explanation:

P and Cl are non-metals, so bonds between P and Cl are covalent.

8 0

4 years ago