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3 years ago

Element reactions???

Chemistry

1 answer:

vagabundo [1.1K]3 years ago

3 0

It is C because the element x must reach an octet by forming covalent bonds; in each bond, it shares 1 electron, and as it needs 2 electrons, it must form 2 bonds;

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When aqueous solutions of K3PO4 and Ba(NO3)2 are combined, Ba3(PO4)2 precipitates. Calculate the mass, in grams, of the Ba3(PO4)

Firdavs [7]

Answer:

Mass of Ba₃(PO₄)₂ = 0.0361 g

Explanation:

Given data:

Volume of Ba(NO₃)₂ = 1.2 mL (1.2 × 10⁻³ L )

Molarity of Ba(NO₃)₂ = 0.152 M

Volume of K₃PO₄ = 4.2 mL (4.2 × 10⁻³ L)

Molarity of K₃PO₄ = 0.604 M

Mass of Ba₃(PO₄)₂ produced = ?

Solution:

Chemical equation:

3Ba(NO₃)₂ + 2K₃PO₄ → Ba₃(PO₄)₂ + 6KNO₃

Number of moles of Ba(NO₃)₂ = Molarity × Volume in litter

Number of moles of Ba(NO₃)₂ = 0.152 M × 1.2 × 10⁻³ L

Number of moles of Ba(NO₃)₂ = 0.182 × 10⁻³ mol

Number of moles of K₃PO₄ = Molarity × Volume in litter

Number of moles of K₃PO₄ = 0.604 M × 4.2 × 10⁻³ L

Number of moles of K₃PO₄ = 2.537 × 10⁻³ mol

Now we will compare the moles of Ba₃(PO₄)₂ with K₃PO₄ and Ba(NO₃)₂ .

Ba(NO₃)₂ : Ba₃(PO₄)₂

3 : 1

0.182 × 10⁻³ : 1/3 ×0.182 × 10⁻³ = 0.060 × 10⁻³ mol

K₃PO₄ : Ba₃(PO₄)₂

2 : 1

2.537 × 10⁻³ : 1/2 × 2.537 × 10⁻³= 1.269 × 10⁻³ mol

The number of moles of Ba₃(PO₄)₂ produced by Ba(NO₃)₂ are less it will limiting reactant.

Mass of Ba₃(PO₄)₂ = moles × molar mass

Mass of Ba₃(PO₄)₂ = 0.060 × 10⁻³ mol × 601.93 g/mol

Mass of Ba₃(PO₄)₂ = 36.12 × 10⁻³ g

Mass of Ba₃(PO₄)₂ = 0.0361 g

6 0

4 years ago

PLEASE HELP

earnstyle [38]

Answer:
Cp = 0.093 J.g⁻¹.°C⁻¹
Solution:

The equation used for this problem is as follow,

Q = m Cp ΔT ----- (1)

Where;
Q = Heat = 300 J

m = mass = 267 g

Cp = Specific Heat Capacity = ??

ΔT = Change in Temperature = 12 °C

Solving eq. 1 for Cp,

Cp = Q / m ΔT

Putting values,
Cp = 300 J / (267 g × 12 °C)

Cp = 0.093 J.g⁻¹.°C⁻¹

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4 years ago

a sample of double-stranded dna contains 42% cytosine. approximately what percent of the nucleotides in this sample will be thym

Simora [160]

Answer:

8% thymine

Explanation:

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3 years ago

Write 6319857 in scientific notation

Anna71 [15]

Answer:

6.319857 * 10 to the power 7

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3 years ago

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Complete the following radioactive decay problem. 238 Np → 93 0 e + - 1

JulijaS [17]

Answer:

238 94Pu

Explanation:

From the question given, we noticed that the element is undergoing beta minus decay. This means that the daughter nuclei obtained will have the same mass number as the parent element and the the atomic number of the daughter nuclei will increase by 1.

Please see attached photo on how to arrive at the answer.

5 0

3 years ago