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Scorpion4ik [409]

1 year ago

13

QUIZ 3: GOLDEN YEARS TO BOHR MODEL quizleConsider the two electron arrangements for neutral atoms A and B. What is the atomic nu

mber of A

1 answer:

ELEN [110]1 year ago

5 0

Answer:

11

Explanation:

trust me

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Experience in star is very nice

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2 years ago

I NEED HELP PLEASE, THANKS! :)

EleoNora [17]

Answer:

$\large \boxed{\text{2.20 g Pb}}$

Explanation:

They gave us the masses of two reactants and asked us to determine the mass of the product.

This looks like a limiting reactant problem.

1. Assemble the information

We will need a chemical equation with masses and molar masses, so, let's gather all the information in one place.

Mᵣ: 239.27 32.00 207.2

2PbS + 3O₂ ⟶ 2Pb + 2SO₃

m/g: 2.54 1.88

2. Calculate the moles of each reactant

$\text{Moles of PbS} = \text{2.54 g PbS } \times \dfrac{\text{1 mol PbS}}{\text{239.27 g PbS}} = \text{0.010 62 mol PbS}\\\\\text{Moles of O}_{2} = \text{1.88 g O}_{2} \times \dfrac{\text{1 mol O}_{2}}{\text{32.00 g O}_{2}} = \text{0.058 75 mol O}_{2}$

3. Calculate the moles of Pb from each reactant

$\textbf{From PbS:}\\\text{Moles of Pb} = \text{0.010 62 mol PbS} \times \dfrac{\text{2 mol Pb}}{\text{2 mol PbS}} = \text{0.010 62 mol Pb}\\\\\textbf{From O}_{2}:\\\text{Moles of Pb} =\text{0.058 75 mol O}_{2} \times \dfrac{\text{2 mol Pb}}{\text{3 mol O}_{2}}= \text{0.039 17 mol Pb}\\\\\text{PbS is the $\textbf{limiting reactant}$ because it gives fewer moles of Pb}$

4. Calculate the mass of Pb

$\text{ Mass of Pb} = \text{0.010 62 mol Pb} \times \dfrac{\text{207.2 g Pb}}{\text{1 mol Pb}} = \textbf{2.20 g Pb}\\\\\text{The reaction produces $\large \boxed{\textbf{2.20 g Pb}}$}$

4 0

2 years ago

11. Which is the solubility product expression for Na3PO4(s)?

dlinn [17]

Answer: B

Explanation: the 3 in Na3PO4(s) belong to the sodium atom (Na). so in any of these equations, the 3 would have to be with Na.

A- the 3 is along w the PO4, which would make it part of that bond

C- there is no 3 at all for Na in this choice, making it incorrect

D- Again, the 3 is placed on the other half of the bond

8 0

2 years ago

In the reaction 2 c o2 → 2 co, how many moles of carbon are needed to produce 66.0 g of carbon monoxide

weeeeeb [17]

The solution would be like this for this specific problem:

<span>Given:

</span>66.0 g of carbon monoxide

reaction 2 C + O2 → 2 CO

<span>mol e= mass / molar mass <span>
<span>mole of 2CO = 66.0g / (12.011 15.999)g / mol </span>
mole of 2CO = 2.36 (CO and C has a 1:1 mole ratio)

mole of 2CO = 2.36 -> mole of 1 CO = 2.36 / 2 = 1.18

<span>We got 2 moles of C, thus 1.18 x 2 = 2.36

So, we 2.36 </span>moles of carbon are needed to produce 66.0 g of carbon monoxide in the </span>reaction 2 C + O2 → 2 CO.</span> <span>To add, Carbon nonmetallic and tetravalent, thus, making four electrons available to form covalent chemical bonds. </span>

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2 years ago

Which of the following describes a compound? (Hint: Carbon and oxygen both appear on the periodic table.)

Alekssandra [29.7K]

Answer:

A

Explanation:

a compound is a pure substance and A tells that

5 0

2 years ago