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mina [271]
3 years ago
11

A 400g sample is found to be 27% aluminum. What is the mass percent of A1 in the sample?

Chemistry
1 answer:
Roman55 [17]3 years ago
8 0

34.59%

Explanation:
In order to calculate the mass percent of aluminum in that ionic compound, we're going to need two things:
1: The formula mass of the entire compound

2: The atomic mass of aluminum

The formula mass of aluminum hydroxide is
78.00
g
m
o
l
because:
26.98
g
m
o
l
+
3
(
16.00
g
mol
)
+
3
(
1.0079
g
mol
)

=
78.00
g
m
o
l

We already know the atomic mass of aluminum since that's already given.
Now, we have to use the following equation:
https://wilsonsch3u-01-2012.wikispaces.com/Unit+4+Moles?responseToken=6fbe1bc52003b1c7d0a470e50127b3a2
https://wilsonsch3u-01-2012.wikispaces.com/Unit+4+Moles?responseToken=6fbe1bc52003b1c7d0a470e50127b3a2
The numerator represents the mass of the desired atom, which is Al in our case, and the denominator represents the mass of the entire compound. You just divide the two and multiply by 100 to obtain the percent composition:
Mass of Al
Molar Mass of Al(OH)
3
×
100
%

26.98 g/mol
78.00g/mol
×
100
%
=
34.59
%
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77julia77 [94]

Answer:

Metals and non-metals are substances that can be differentiated on the basis of various physical and chemical properties. Metals are the elements that are generally hard as strong metallic bond exists between the atoms. As against non-metals are the elements which are usually soft.

7 0
3 years ago
Determine the concentration of a solution (M) made by dissolving 18.8 g of sodium chloride (NaCl) in 750.0 mL of solution.
Viefleur [7K]

Answer:

0.429 M

Explanation:

To find the molarity, you need to (1) convert grams to moles (using the molar mass), then (2) convert mL to L, and then (3) calculate the molarity (using the molarity ratio).

(Step 1)

Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol

Molar Mass (NaCl): 58.443 g/mol

18.8 grams NaCl               1 mole
--------------------------  x  ------------------------  =  0.322 moles NaCl
                                     58.443 grams

(Step 2)

1,000 mL = L

 750.0 mL                1 L
------------------  x  -----------------  =  0.7500 L
                            1,000 mL

(Step 3)

Molarity (M) = moles / volume (L)

Molarity = 0.332 moles / 0.7500 L

Molarity = 0.429 M

5 0
2 years ago
What is the minimum mass of hubnerite (MnWO4), a tungsten ore, from which 95.0 g of pure tungsten could be extracted?
Gnoma [55]

From one mole of MnWO4, we get one mole of tungsten. Therefore 10.88 mol of tungsten will be obtained from 10.88 mol of MnWO4.

Molar mass MnWO4 = 54.94 + 183.84 + 4(16.0) = 302.78 g.mol-1

Therefore mass of MnWO4 required = mole x molar mass = 10.88 mol x 302.78 g.mol-1 = 3294.24 grams

And, 3294.24 grams = > 3.29424 kg

On rounding off to two significant digits, we get 3.3 kg.

Rounds a number to 3 significant digits the same way it rounds to 3 decimal places. Count up to 3 digits from the first non-zero digit. Then round off the last digit. Pad the remaining digits to the right of the decimal point with zeros. 0.0560 has 3 significant digits. In accordance with scientific conventions, leading zeros in decimal numbers are not treated as significant. So exclude 0.0 from 0.0560.

Learn more about Significant digits here:-brainly.com/question/28052368

#SPJ1

8 0
1 year ago
A substance can change into a new kind of molecule when:
Artyom0805 [142]

Answer:

Chemical changes cause a substance to change into an entire substance with a new chemical formula. Chemical changes are also known as chemical reactions. The “ingredients” of a reaction are called reactants, and the results are called products.

Hope it helps

4 0
3 years ago
A(n) ______________ is an organism that lives on another organism and causes harm to that organism
RoseWind [281]

Answer: The answer is Parasite ma dude

Explanation:

In evolutionary ecology, parasitism is a symbiotic relationship between species, where one organism, the parasite, lives on or in another organism, the host, causing it some harm, and is adapted structurally to this way of life.

Hopes this helps

8 0
3 years ago
Read 2 more answers
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