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2 years ago

what is the number of moles formed when 20.50g of Copper 2 oxide completely react with hydrogen gas.

Chemistry

1 answer:

CaHeK987 [17]2 years ago

4 0

CuO(aq) + H2(g) → H2O(l) + Cu(s)

CuO= 64 + 16= 80g

1 mole of CuO → 1 mole of Cu

80g of CuO → 1 mole of Cu

20.50g of CuO → y

y= 20.50/80= 0.26mole.

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Which hydrocarbons are present in styrene?<br> a) alkene <br> b) alkyne<br> c) none of the above?

sleet_krkn [62]

Option a: alkene

Styren is C6H5CH=CH2, i.e. ethenylbenzene

6 0

3 years ago

Which reactants would lead to a spontaneous reaction?

balandron [24]

Answer: Option (b) is the correct answer.

Explanation:

The elements which have excess or deficiency of electrons will react readily.

Atomic number of Mn is 25 and electronic configuration of $Mn^{2+}$ is [Ar] $4s^{0}3d^{5}$ . This configuration is stable.

Atomic number of Cr is 24 and electronic configuration of $Cr$ is [Ar] $4s^{1}3d^{5}$ . This configuration is not stable.

Atomic number of Fe is 26 and electronic configuration of $Fe$ is [Ar] $4s^{2}3d^{6}$ . This configuration is stable.

Atomic number of Cu is 29 and electronic configuration of $Cu^{2+}$ is [Ar] $4s^{0}3d^{9}$ . This configuration is not stable.

Atomic number of Al is 13 and electronic configuration of Al is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{1}$ . This configuration is not stable.

Atomic number of Ba is 56 and electronic configuration of $Ba^{2+}$ is [Kr] $4d^{10}5s^{2}5p^{6}$ . This configuration is stable.

Atomic number of Mg is 12 and electronic configuration of $Mg^{2+}$ is $1s^{2}2s^{2}2p^{6}$ . This configuration is stable.

Atomic number of Sn is 50 and electronic configuration of Sn is [Kr] $4d^{10}5s^{2}5p^{2}$ . This configuration is stable.

Thus, we can conclude that out of the given options, only Fe and $Cu^{2+}$ reactants would lead to a spontaneous reaction as they have incomplete sub-shells. Therefore, in order to gain stability they will readily react.

8 0

3 years ago

Which molecule has a polar bond but is nonpolar in nature

Snezhnost [94]

CCl₄ - carbon tetrachloride

This molecule has 4 polar bonds, but is non-polar in nature.
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7 0

3 years ago

Wood has a density of 0.531 g/cm3. What is the volume of 44 grams of wood?

Sunny_sXe [5.5K]

Answer:

<h3>The answer is 82.86 cm³</h3>

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

$volume = \frac{mass}{density} \\$

From the question

mass of wood = 44 g

density = 0.531 g/cm³

It's volume is

$volume = \frac{44}{0.531} \\ = 82.86252354...$

We have the final answer as

Hope this helps you

3 0

3 years ago

NH,F+ _AICI,<br>__NH,CI + __A!F,

mart [117]

Explanation:

NH₄F+ AICI₃, → NH₄CI + AlF₃

NH,F: in ionic form

NH₄⁺ + F⁻ = NH₄F

AICI in ionic form:

Al³⁺ + Cl⁻ = AlCl₃

NH Cl in ionic form:

NH₄⁺ + Cl⁻ = NH₄Cl

Al F in ionic form:

Al³⁺ + F⁻ = AlF₃

NH₄F+ AICI₃, → NH₄CI + AlF₃

Now we have to balance the equation with respect to the atoms:

aNH₄F+ bAICI₃, → cNH₄CI + dAlF₃

for N: a = c

H: 4a = 4c

F: a = 3d

Cl: 3b = c

let a = 1

c = 1

b = $\frac{1}{3}$

d = $\frac{1}{3}$

Therefore we can imply that:

a = 3, b = 1 , c = 3 and d = 1 if we multiply through by 3

3NH₄F+ AICI₃, → 3NH₄CI + AlF₃

Learn more:

Chemical equation brainly.com/question/2924195

#learnwithBrainly

8 0

3 years ago

what is the number of moles formed when 20.50g of Copper 2 oxide completely react with hydrogen gas.​

what is the number of moles formed when 20.50g of Copper 2 oxide completely react with hydrogen gas.