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Arte-miy333 [17]
3 years ago
12

PLEASE HELP WITH ALL! Do the following Mole conversions:

Chemistry
1 answer:
ExtremeBDS [4]3 years ago
7 0

Answer:

The answer to your question is below

Explanation:

1)  number of molecules = x

   23 g of CoCl₂

Molar mass CoCl₂ = 59 + 71 = 130 g

                    130 g ------------------ 6.023 x 10²³ molecules

                      23 g -----------------  x

                      x = (23 x 6.023 x 10²³) / 130

                     x = 1.066 x 10²³ molecules

2)

3.2 moles of H₃PO₄ to grams

Molar mass = 3 + 31 + (16 x 4)

                   = 98 g

                      98 g ------------------- 1 mol

                        x     ------------------- 3.2 moles

                        x = (3.2 x 98)/1

                        x = 313.6 g

3)

2.2 moles of (NH₄)₂ to grams

Molar mass = (14 x 2) + (8 x 1)

                    = 36 g

                      36 g of (NH₄)₂ ---------------- 1 mol

                        x                     ---------------- 2.2 moles

                        x = (2.2 x 36)/1

                        x = 79.2 grams

4)

Molecules = ? 4.5 g of NH₄SO₂

Molar mass = 14 + 32 + 32 + 4

                   = 82 g

                      82 g of NH₄SO₂ --------------- 6.023 x 10²³ molecules

                      4.5 g                   ---------------- x

                      x = (4.5 x 6.023 x 10²³) / 82

                      x = 3.3 x 10²³ molecules

5)

Liters of N₂ = ?  7.9 x 10³⁰ particles

                     22.4 l --------------------- 6.023 x 10²³ particles

                        x      --------------------  7.9 x 10³⁰

                        x = (7.9 x 10³⁰ x 22.4) / 6.023 x 10²³

                        x = 2.93 x 10⁸ particles

                         

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After that, the second step derives that when oxalic acid is in aqueous solution eliminates other proton so it represent the polyprotic acid

Now the chemical equations are as follows:

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Answer:

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2) The nuclear binding energy for 1 mol of Ne is 1.6 *10^13 J/mol

Explanation:

Step 1: Data given

The nucleus of a21Ne atom has a amass of 20.98846 amu.

Step 2: Calculate number of protons and neutrons

The number of electrons and protons in an 21Ne atom = 10

The number of neutrons = 21 -10 =11

Step 3: mass of the atom

Mass of a proton = 1.00727647 u

Mass of a neutron = 1.0086649 u

The mass of the atom = mass of all neutrons + mass of protons

Mass of atom = 11*1.0086649 + 10*1.00727647  = 21.1680786 amu

Step 4: Calculate change of mass

The change in mass = Mass of atom - mass of neon

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Step 5: Calculate mass for a single nucleus

The change of mass for a single nucleus is = Δmass / number of avogadro

Δmass of nucleus = 0.1796186 / 6.022*10^23

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Step 6: Calculate energy to break a Ne nucleus

Calculate the amount of energy to break a Ne nucleus

ΔEnucleus = Δmass of nucleus * c²

⇒ with c = 2.9979 *10^8 m/s

ΔEnucleus = 2.98 * 10^-28 kg * (2.9979*10^8)² = 2.68 * 10^-11 J

What is the nuclear binding energy for 1 mol of Ne?

ΔE= ΔEnucleus * number of avogadro

ΔE= 2.68 * 10^-11 J * 6.022*10^23

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