27.0 g
Explanation:
The density of a substance tells you the mass of exactly one unit of volume of said substance.
In your case, aluminium is said to have a density of
density Al
=
2.70 g
.
cm
−
3
This tells you that every
1 mL
of aluminium has a mass of
2.70 g
.
All you have to do now is use the density of aluminium as a conversion factor to go from cubic centimenters of aluminium to grams
10.0
cm
3
⋅
2.70 g
1
cm
3
=
27.0 g
−−−−−
The answer is rounded to three sig figs.
The correct answer to this open question is the following.
Decide whether the elements of a typical conclusion paragraph are in the correct order.
So this is the correct order.
1.- summary of the main thesis.
2.- restatement thesis.
3.- satisfying close.
This is the explanation. When you are writing a conclusion, you have to be precise, summarize the main ideas of the document, not adding something new or different, restate the thesis, and give direct-to-the-point closing ideas so the reader can get the main purpose of the document clear.
Writing a good conclusion is very important because it represents the last idea that you want to convey to your readers and formally ends your essay.
Answer:
The problem tells you that
6 g
of hydrogen gas,
H
2
, react with an unknown mass of oxygen gas,
O
2
, to form
54 g
of water.
As you know, the law of mass conservation tells you that the in a chemical reaction the total mass of the reactants must be equal to the total mass of the products.
In your case, this can be written as
total mass of reactants
m
H
2
+
m
O
2
=
mass of product
m
H
2
O
This means that the reaction must have consumed
m
O
2
=
m
H
2
O
−
m
H
2
m
O
2
=
54 g
−
6 g
=
48 g O
2
Explanation:
I'll show you two approaches to solving this problem, one really short and one relatively long.
The answer to the question is: significantly lower
