The temperature at which a substance in the liquid phase transforms to the gaseous phase refers to the substance's _______. A. sublimation point B. boiling point C. melting point D. freezing point

Answer:

Which atomic model describes the atom as a nucleus surrounded by electrons that may travel as waves in the electron cloud?

Explanation:

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Answer:

                     Mass of Sodium  =  574.75 g

                     Mass of Chlorine  =  886.25 g

Explanation:

                   The  balance chemical equation for the synthesis of NaCl is,

                                        2 Na + Cl₂ → 2 NaCl

Step 1: Find out moles of each reactant required,

According to balance chemical equation,

                 2 moles of NaCl is produced by  =  2 moles of Na

So,

         25 moles of NaCl will be produced by  =  X moles of Na

Solving for X,

                     X  =  25 mol × 2 mol /  2 mol

                     X  =  25 moles of Na

Similarly for Cl₂,

According to balance chemical equation,

                 2 moles of NaCl is produced by  =  1 mole of Cl₂

So,

         25 moles of NaCl will be produced by  =  X moles of Cl₂

Solving for X,

                     X  =  25 mol × 1 mol /  2 mol

                     X  =  12.5 moles of Cl₂

Step 2:Convert each moles to mass as;

Mass  =  Moles × Atomic Mass

For Na,

Mass  =  25 mol × 22.99 g/mol

Mass  =  574.75 g

For Cl₂,

Mass  =  12.5 mol × 70.90 g/mol

Mass  =  886.25 g

Mass of Sodium =  574.75 g and Mass of Chlorine =  886.25 g

The  balanced chemical equation for the synthesis of NaCl:

The number of moles can be calculated by dividing given mass over molar mass.

2 Na + Cl₂ → 2 NaCl

Calculation for moles:

2 moles of NaCl is produced by  =  2 moles of Na

So,

25 moles of NaCl will be produced by  =  x moles of Na

Solving for x,

x  =  25 mol × 2 mol /  2 mol

x =  25 moles of Na

Similarly for Cl₂,

2 moles of NaCl is produced by  =  1 mole of Cl₂

So,

25 moles of NaCl will be produced by  =  x moles of Cl₂

Solving for x,

x  =  25 mol × 1 mol /  2 mol

x =  12.5 moles of Cl₂

Conversion of moles from mass:

Mass  =  Moles × Atomic Mass

For Na,

Mass  =  25 mol × 22.99 g/mol

Mass  =  574.75 g

For Cl₂,

Mass  =  12.5 mol × 70.90 g/mol

Mass  =  886.25 g

Find more information about Molar mass here:

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Answer:

Planet: The object orbits the sun

Not planet: The object is a satellite

Planet: The regions surrounding the object are free from debris

Not Planet: The object is triangular in shape.

Explanation:

A planet is characterized as:

Spheroidal (or at least big enough to be round-ish)

It should orbit the sun (not other planets, so satellites like the moon is not considered as a planet)

It should have no debris, or cleared of debris around its orbit

Although there is now the dwarf planet category, it satisfies almost all charateristics to be considered a planet, except the cleared of debris part.

Answer:

Planet: The object orbits the sun

Not planet: The object is a satellite

Planet: The regions surrounding the object are free from debris

Not Planet: The object is triangular in shape.

Answer:

Mass of phosphoric acid = 6.37 g

Mass of magnesium nitride = 50.5 g

Mass of  iron chloride = 22.71 g

Explanation:

1 = Given data:

Mass of phosphorus = 4 g

Mass of phosphoric oxide = ?

Solution:

4P +  5O₂  →  2P₂O₅

Number of moles of phosphorus = mass / molar mass

Number of moles of phosphorus = 4 g / 31 g/mol

Number of moles of phosphorus = 0.13 mol

Mole ration of phosphorus and phosphoric acid.

                                 P        :         P₂O₅

                                 4        :           2

                               0.13      :          2/4× 0.13 = 0.065 mol

Mass of phosphoric acid:

Mass of phosphoric acid = moles × molar mass

Mass of phosphoric acid = 0.065 mol × 98 g/mol

Mass of phosphoric acid = 6.37 g

2 = Given data:

Mass of magnesium = 36 g

Mass of magnesium nitride = ?

Solution:

3Mg  + N₂   →   Mg₃N₂

Number of moles of magnesium = mass / molar mass

Number of moles of magnesium = 36 g / 24 g/mol

Number of moles of magnesium = 1.5 mol

Mole ration of magnesium and magnesium nitride.

                                 Mg     :        Mg₃N₂

                                 3        :           1

                               1.5        :          1/3× 1.5 = 0.5 mol

Mass of magnesium nitride:

Mass of magnesium nitride = moles × molar mass

Mass of magnesium nitride = 0.5 mol × 101 g/mol

Mass of magnesium nitride = 50.5 g

3 = Given data:

Mass of iron = 8 g

Mass of iron chloride = ?

Solution:

2Fe  + 3Cl₂   →   2FeCl₃

Number of moles of iron = mass / molar mass

Number of moles of iron = 8 g / 55.85 g/mol

Number of moles of iron = 0.14 mol

Mole ration of iron and iron chloride.

                                Fe     :        FeCl₃

                                 2        :           2

                               0.14       :          0.14

Mass of iron chloride:

Mass of  iron chloride = moles × molar mass

Mass of iron chloride = 0.14 mol × 162.2 g/mol

Mass of  iron chloride = 22.71 g