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3 years ago

26. Which method is correct for determining the number of gallons required to fill an automobile's

Chemistry

1 answer:

Zielflug [23.3K]3 years ago

8 0

Answer:

b is correct method.

Explanation:

Given that,

Volume of tank = 64 liter

We need to find the conversion liter to quarts

Using conversion

$1\ L=\dfrac{1\ l}{1.057\ quarts}$

We need to find the conversion quarts to gallons

Using conversion

$1\ quarts=\dfrac{1\ l}{4\ gallons}$

We need to find correct method

Using conversion

$64\ L=\dfrac{1\ L}{1.057}\times\dfrac{1\ gallon}{4\ quarts}$

Hence, b is correct method.

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A 1.10 g sample contains only glucose and sucrose. When the sample is dissolved in water to a total solution volume of 25.0L, th

olga_2 [115]

Answer:

$\large \boxed{79 \, \%}$

Explanation:

I assume the volume is 2.50 L. A volume of 25.0 L gives an impossible answer.

We have two conditions:

(1) Mass of glucose + mass of sucrose = 1.10 g

(2) Osmotic pressure of glucose + osmotic pressure of sucrose = 3.78 atm

Let g = mass of glucose

and s = mass of sucrose. Then

g/180.16 = moles of glucose, and

s/342.30 = moles of sucrose. Also,

g/(180.16×2.50) = g/450.4 = molar concentration of glucose. and

s/(342.30×2.50) = s/855.8 = molar concentration of sucrose.

1. Set up the osmotic pressure condition

Π = cRT, so

$\begin{array}{rcl}\Pi_{\text{g}} +\Pi_{\text{s}}&=&\Pi_{\text{tot}}\\\dfrac{g}{450.4}\times8.314\times298 + \dfrac{s}{855.8}\times8.314\times298 & = & 3.78\\\\5.501g + 2.895s & = & 3.78\\\end{array}$

Now we can write the two simultaneous equations and solve for the masses.

2. Calculate the masses

$\begin{array}{lrcl}(1)& g + m & = & 1.10\\(2) &5.501g +2.895s & = & 3.78\\(3) & m & = &1.10 - g\\&5.501g + 2.895(1.10 - g) & = & 3.78\\&2.606g + 3.185 & = & 3.78\\ &2.606g & = & 0.595\\(4) & g & = & \mathbf{0.229}\\&0.229 + s & = & 1.10\\& s & = & \mathbf{0.871}\\\end{array}$

We have 0.229 g of glucose and 0.871 g of sucrose.

3. Calculate the mass percent of sucrose

$\text{Mass percent} = \dfrac{\text{Mass of component}}{\text{Total mass}} \times \, 100\%\\\\\text{Percent sucrose} = \dfrac{\text{0.871 g}}{\text{1.10 g}} \times \, 100\% = 79 \, \%\\\\\text{The mixture is $\large \boxed{\mathbf{79 \, \%}}$ sucrose}$

6 0

3 years ago

Which type of property can be observed only by changing a substance into a different substance?

Svetradugi [14.3K]

Answer: chemical property.

Explanation:

The chemical properties are the capacity or incapacity of a substance to transform into one or more different substance either by reacting with one or more different substances or by decomposition.

Such properties can only be observed when such change (reaction) takes place and the substance, therefore, is transformed into one or more different substances.

On the other hand, the physicial properties can be observed or measured without changing the composition of the sample.

4 0

4 years ago

Read 2 more answers

Which skill involves creating representation of complex objects or processes

lesya692 [45]

Answer:

Making models

Explanation:

Classifying is the grouping together of items that are alike in some way. Answer: Making models involves creating rep- resentations of complex objects or processes.

6 0

3 years ago

Combustion reactions are a notable source of carbon dioxide in the environment. Using the following balanced equation, how many

iris [78.8K]

Answer:

Explanation:

Number of moles of propane:

=Mass in grams ÷ Relative molecular Mass

= 100/((12*3) + (1*8))

= 100 ÷ 44

= 2.2727

Mole ratio propane:carbon (IV) oxide = 1:3(from the equation)

Number of moles of CO2 = 3*2.2727 = 6.8181

Mass in grams = Relative molecular Mass * Number of moles

= 44 * 6.8181

= 299.9964 grams

8 0

4 years ago

What is the difference between chemical and electrical gradient? When defined, they both sound very similar; is there a way to d

soldi70 [24.7K]

chemical gradient is defined as the a gradient appearance by the dissimilarity in concentration of a certain type of solute in an universal solvent take examples like salt in water.

<span> electrical gradient is defined as the disparity between the electrical potential of a given solute in an universal solvent. fundamentally, if the chemical that establishes the chemical gradient is electrically charged. Then the diversity in the charge over the barrier will produce an electrical gradient</span>

<span>hope it helps</span>

3 0

3 years ago