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Wittaler [7]
3 years ago
10

Explain why methane has a low melting point

Chemistry
1 answer:
LenKa [72]3 years ago
3 0
Simple molecular substances consist of molecules in which the atoms are joined by strong covalent bonds. However, the molecules are held together by weak forces so these substances have low melting and boiling points.
I hope this helps.=^D
You might be interested in
Nitrogen reacts with a metal to form a compound in which there are three atoms of the metal for each atom of nitrogen. if 1.486
trapecia [35]

We are given that:

1 atom N = 3 atom of the metal

1 mol N = 3 mol of the metal

 

First let us convert the given nitrogen into number of moles:

moles N = 1 g / (14 g / mol)

moles N = 0.071 mol

 

Therefore the atomic or molar mass of the metal is:

molar mass = 1.486 g / (3 * 0.071 mol)

<span>molar mass = 6.93 g / mol</span>

5 0
3 years ago
Calcium hydroxide is partially soluble as shown by the
Blizzard [7]

Answer:

4

10

Explanation:

The reaction equation is given as;

            Ca(OH)₂     →    Ca²⁺   + 2OH⁻

Concentration of Ca(OH)₂ = 5 x 10⁻⁵M

         

Unknown:

pOH of the solution  = ?

pH of the solution = ?

Solution:

Solve for the pOH of this solution using the expression below obtained from the ionic product of water;

                 pOH  = ⁻log₁₀[OH⁻]

           Ca(OH)₂             →           Ca²⁺              +              2OH⁻

          1moldm⁻³                         1moldm⁻³                     2 x 1moldm⁻³

         5 x 10⁻⁵moldm⁻³         5 x 10⁻⁵moldm⁻³            2( 5 x 10⁻⁵moldm⁻³ )

                                                                                            1 x 10⁻⁴moldm⁻³

  Therefore;

             pOH = -log₁₀ 1 x 10⁻⁴ = 4

Since

           pOH + pH  = 14

                        pH  = 14  - 4  = 10

4 0
4 years ago
How many grams of phosphorus are in a sample containing 10^30 phosphorus atoms?
san4es73 [151]

Answer:

18.1 g

 

Explanation:

You know that the atomic weight of phosphorus is equal to  

30.794 u

, where  

u

represent the unified atomic mass unit.

The unified atomic mass unit is equivalent to  

1 g/mol

, but let's take the long road and prove that identity.

Now, the unified atomic mass unit is defined as  

1

12

th

of the mass of a single unbound carbon-12 atom in its ground state and is equivalent to

1 u

=

1.660539

⋅

10

−

24

g

This means that the mass of one phosphorus atom will be

30.974

u

⋅

1.660539

⋅

10

−

24

g

1

u

=

5.14335

⋅

10

−

23

g

You know that one mole of any element contains exactly  

6.022

⋅

10

23

atoms of that element - this is known as Avogadro's number.

Well, if you know the mass of one phosphorus atom, you can use Avogadro's nubmer to determine what the mass of one mole of phosphorus atoms

5.14335

⋅

10

−

23

g

atom

⋅

6.022

⋅

10

23

atoms

1 mole

=

30.974 g/mol

Finally, if one mole of phosphorus atoms has a mass of  

30.974 g

, then  

0.585

moles will have a mass of

0.585

moles

⋅

30.974 g

1

mole

=

18.1 g

From: https://socratic.org/questions/the-atomic-weight-of-phosphorus-is-30-974-u-what-is-the-mass-of-a-phosphorus-sam

3 0
3 years ago
How to do question 23
Advocard [28]

Answer:

A

Explanation:

7 0
4 years ago
__H2 + __O2 --&gt; __H2O
nekit [7.7K]

Answer:

42.3moles

Explanation:

The chemical equation given in this question is as follows:

H2 + O2 → H2O

However, this equation is unbalanced, the balanced chemical equation is as follows:

2H2 + O2 → 2H2O

This equation shows that;

2 moles of hydrogen gas (H2) will produce 2 moles of water (H2O)

Hence, If 42.3 moles of water (H2O) are produced, 42.3 × 2/2

= 42.3moles of hydrogen was reacted.

6 0
3 years ago
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