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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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How many moles of hydrogen atoms are there in one mole of C6H12O2
zvonat [6]

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<h3>Further explanation</h3>

Given

C₆H₁₂O₂ compound

Required

moles of Hydrogen

Solution

In a compound, there is a mole ratio of the constituent elements.

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7 0
3 years ago
Covert 1.57 x 10^14 nm= ___m
LekaFEV [45]

Answer:

1.57 x 10⁷m

Explanation:

Given quantity is;

          1.57 x 10¹⁴nm

Now;

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So, let us convert this given quantity;

         1 nm          =             10⁻⁹

  1.57 x 10¹⁴nm  will give 1.57 x 10¹⁴ x 10⁻⁹  = 1.57 x 10⁷m

 

7 0
3 years ago
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