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2 years ago

9

If you have exactly 2.00 moles each, of two different substances, then which of the following must be true about the two samples

?

1 answer:

Alenkinab [10]2 years ago

4 0

The two samples have the same number of atoms.

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Iron(III) oxide and hydrogen react to form iron and water, like this:

Andru [333]

Answer:mmmm popeyes chicken

Explanation:

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1 year ago

suppose that you are comparing several objects. is it correct to say that the object with the largest volume has the largest mas

Semmy [17]

Answer:

No

Explanation:

It is not correct to say that an object with the largest volume has the largest mass.

Mass and volume are not directly related. In fact, the relationship between them can be direct or inverse.

Mass is the amount of matter in a substance. Volume is the space a body occupies.

A balloon and a stone for example is a typical one.
A balloon has more volume but far lesser mass compared to a stone.
A stone, gravel sized has low volume but more massive than a balloon.

Therefore, it is wrong to say a balloon has more mass because it has more volume.

3 0

1 year ago

What is the volume of an irregular object if the initial volume in the graduated cylinder is 3.50 ml and it rises to 7.50 ml aft

Margarita [4]

Answer is: the volume of an irregular object is 4,00 ml.
<span>Volume is the amount of space the object occupies and can be finded immersing it in water in a container with volume markings and than see how much the level of the container changes (goes up).
</span>V(irregular object) = V(final volume) - V(initial volume).
V(irregular object) = 7,50 ml - 3,50 ml.
V(irregular object) = 4,00 ml.

8 0

2 years ago

Why does a group of warmer atoms take up more volume than a group of cooler atoms ?

const2013 [10]

Warmer atoms expand. There is also more movement. This is also explained when putting it into terms with solid vs. gas. in a solid, the atoms vibrate, but they can't move very far because there is not a lot of space between them. In a gas, on the other hand, the atoms are spread apart, and they move very fast. Putting it into context with water, the steam (gas) version is hot, and the ice cube (solid) version is cold.

7 0

2 years ago

Read 2 more answers

Polymers are large molecules composed of simple units repeated many times. Thus, they often have relatively simple empirical for

elena55 [62]

Answer:

(a) $C_5H_8O_2$

(b) $CHCl$

(c) $CH_2$

(d) $CH$

(e) $C_3H_3N$

Explanation:

Hello,

(a) For the lucite, one computes the moles of C, H and O that are present:

$n_C=0.599gC*\frac{1molC}{12gC}=0.05molC\\n_H=0.0806gH*\frac{1molH}{1gH}=0.0806molH\\n_O=0.32gO*\frac{1molO}{16gO}=0.02molO\\$

Now, dividing each moles by the smallest moles (oxygen's moles), one obtains:

$C=\frac{0.05}{0.02} =2.5;H=\frac{0.0806}{0.02} =4;O=\frac{0.02}{0.02} =1$

Finally, we look for the smallest whole number subscript by multiplying by 2, so the empirical formula turns out into:

$C_5H_8O_2$

(b) For the Saran, one computes the moles of C, H and Cl that are present:

$n_C=0.248gC*\frac{1molC}{12gC}=0.021molC\\n_H=0.02gH*\frac{1molH}{1gH}=0.02molH\\n_{Cl}=0.731gCl*\frac{1molCl}{35.45gCl}=0.021molCl\\$

Now, dividing each moles by the smallest moles (hydrogen's moles), one obtains:

$C=\frac{0.021}{0.02} =1;H=\frac{0.02}{0.02} =1;Cl=\frac{0.021}{0.02} =1$

Finally, as all of the subscripts are whole numbers, the empirical formula turns out into:

$CHCl$

(c) For the polyethylene, one computes the moles of C and H that are present:

$n_C=0.86*\frac{1molC}{12gC}=0.072molC\\n_H=0.14gH*\frac{1molH}{1gH}=0.14molH$

Now, dividing each moles by the smallest moles (carbon's moles), one obtains:

$C=\frac{0.072}{0.072} =1;H=\frac{0.14}{0.072} =2$

Finally, as all of the subscripts are whole numbers, the empirical formula turns out into:

$CH_2$

(d) For the polystyrene, one computes the moles of C and H that are present:

$n_C=0.923*\frac{1molC}{12gC}=0.077molC\\n_H=0.077gH*\frac{1molH}{1gH}=0.077molH$

Now, dividing each moles by the smallest moles (either carbon's or hydrogen's moles), one obtains:

$C=\frac{0.077}{0.077} =1;H=\frac{0.077}{0.077} =1$

Finally, as all of the subscripts are whole numbers, the empirical formula turns out into:

$CH$

(e) For the orlon, one computes the moles of C, H and N that are present:

$n_C=0.679*\frac{1molC}{12gC}=0.057molC\\n_H=0.057gH*\frac{1molH}{1gH}=0.057molH\\n_N=0.264gN*\frac{1molN}{14gN}=0.019molN$

Now, dividing each moles by the smallest moles (nitrogen's moles), one obtains:

$C=\frac{0.057}{0.019} =3;H=\frac{0.057}{0.019} =3;N=\frac{0.019}{0.019} =1$

Finally, as all of the subscripts are whole numbers, the empirical formula turns out into:

$C_3H_3N$

Best regards.

3 0

2 years ago