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jonny [76]
2 years ago
11

HELP

Chemistry
1 answer:
Wittaler [7]2 years ago
8 0

Answer:

Explanation:

1.

 Given parameters:

Number of moles of CaO = 0.22moles

Unknown:

Mass of CaO = ?

Solution:

Mass, number of moles and molar mass are related using the expression below;

  Mass  = number of moles x molar mass

Molar mass of CaO  = 40 + 16  = 56g/mol

  Insert the parameters and solve;

  Mass = 0.22 x 56  = 12.32g

2

Given parameters:

Number of moles of NaCl  = 0.83moles

Unknown:

mass of NaCl  = ?

Solution:

Also,

 Mass  = number of moles x molar mass

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

Now insert the parameters and solve;

    mass = 0.83 x 58.5

     mass  = 48.6g

3.

Given parameters:

Number of moles of H₂SO₄  = 0.5moles

Unknown:

mass of H₂SO₄ = ?

Solution:

Mass  = number of moles x molar mass

Molar mass of H₂SO₄  = 2(1) + 32 + 4(16) = 98g/mol

Insert the parameters and solve;

  Mass = 0.5 x 98  = 49g

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Leokris [45]

Answer:

0.0010 mol·L⁻¹s⁻¹  

Explanation:

Assume the rate law is  

rate = k[A][B]²

If you are comparing two rates,

\dfrac{\text{rate}_{2}}{\text{rate}_{1}} = \dfrac{k_{2}\text{[A]}_2[\text{B]}_{2}^{2}}{k_{1}\text{[A]}_1[\text{B]}_{1}^{2}}= \left (\dfrac{\text{[A]}_{2}}{\text{[A]}_{1}}\right ) \left (\dfrac{\text{[B]}_{2}}{\text{[B]}_{1}}\right )^{2}

You are cutting each concentration in half, so

\dfrac{\text{[A]}_{2}}{\text{[A]}_{1}} = \dfrac{1}{2}\text{ and }\dfrac{\text{[B]}_{2}}{\text{[B]}_{1}}= \dfrac{1}{2}

Then,

\dfrac{\text{rate}_{2}}{\text{rate}_{1}} = \left (\dfrac{1}{2}\right ) \left (\dfrac{1}{2}\right )^{2} = \dfrac{1}{2}\times\dfrac{1}{4} = \dfrac{1}{8}\\\\\text{rate}_{2} = \dfrac{1}{8}\times \text{rate}_{1}= \dfrac{1}{8}\times \text{0.0080 mol$\cdot$L$^{-1}$s$^{-1}$} = \textbf{0.0010 mol$\cdot$L$^{-1}$s$^{-1}$}\\\\\text{The new rate is $\large \boxed{\textbf{0.0010 mol$\cdot$L$^\mathbf{{-1}}$s$^{\mathbf{-1}}$}}$}

8 0
3 years ago
Whats the molar mass of potassium nitride
Lyrx [107]
<span>The answer is
101.1032 g/mol</span>
6 0
3 years ago
if you place a crystal substance on a tabletop, return to view it after some time passes, and find it as a powered substance, wh
Goryan [66]
The process which has taken place is called CRYSTALLIZATION.
Generally, crystallization is the process by which solid crystals are precipitated from solution. Crystallization can also occur when a crystal melt or when a crystal get deposited directly from a  gas, although these cases are rarer compare to crystals forming from solutions.
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3 years ago
Determine the density of gold if a 475.09g sample occupy a space of 24.6cm^3
Ira Lisetskai [31]

Answer:

The answer is

<h2>19.31 g/cm³</h2>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume}

From the question

mass of gold = 475.09g

volume = 24.6 cm³

The density of the gold is

density =  \frac{475.09}{24 .6}  \\  = 19.3126016...

We have the final answer as

<h3>19.31 g/cm³</h3>

Hope this helps you

6 0
3 years ago
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IRINA_888 [86]

Answer:

Explanation:

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Consider...

V₁ = V₁     V₂ = 4V₁

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Charles Law => T ∝ V at constant P ... that is, increasing temperature generates a proportional increase in volume to maintain constant pressure.

Empirical Charles Law Relation is ...

V₁/T₁ = V₂/T₂ => T₂ = T₁(V₂/V₁) = T₁(4V₁/V₁) = 4T₁

Increasing Volume of a gas by 4 times requires a 4 times increase in absolute temperature in order to maintain constant pressure.

7 0
3 years ago
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