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kodGreya [7K]
1 year ago
5

Determine the empirical formula for a compound that is 64.8% C, 13.6% H, and 21.6% O by mass.

Chemistry
1 answer:
True [87]1 year ago
8 0

Answer:

C4H10O

In case it's not understandable: c four, h ten, no

Explanation:

Molar mass of each component: C = 12.0107, H = 1.00794, O = 15.9994

Convert to moles: C = 5.3951892895502, H = 13.492866638887, O=1.3500506268985

Find the smallest mole value: 1.3500506268985

Divide all components by the smallest value: C = 3.9962866444087, H=9.9943412269543, O = 1

Round to closest whole numbers: C = 4, H = 10, O = 1

Combine to get the empirical formula: C4H10O

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An element crystallizes in a face-centered cubic lattice. If the length of an edge of the unit cell is 0.408 nm, and the density
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Answer:

Au

Explanation:

For the density of a face-centered cubic:

Density = \dfrac{4 \times M_w}{N_A \times a^3}

where

M_w = molar mass of the compound

N_A= avogadro's constant

a^3 = the volume of a unit cell

Given that:

Density (\rho) = 19.30 g/cm³

a = 0.408 nm

a = 0.408 \times 10^{-9} \times 10^{2} \ cm

a = 4.08 \times 10^ {-8} \ cm

∴

19.3 = \dfrac{4 \times M_w}{(6.023 \tmes 10^{23})\times (4.08 \times 10^{-8})^3}

M_w= \dfrac{19.3\times (6.023 \times 10^{23})\times (4.08 \times 10^{-8})^3}{4}

M_w=197.37 \ g/mol

Thus, the molar mass of 197.37 g/mol element is Gold (Au).

4 0
3 years ago
Rank the following measurements in order from least to greatest
Harman [31]
It’s
1.A
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4 0
3 years ago
Find [H+] of a 0.056 M hydrofluoric acid solution. Ka = 1.45 x 10-7
brilliants [131]

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Explanation:

HF\rightarrow H^+F^-

 cM              0             0

c-c\alpha        c\alpha          c\alpha  

So dissociation constant will be:

K_a=\frac{(c\alpha)^{2}}{c-c\alpha}

Give c= 0.056 M and \alpha = ?

K_a=1.45\times 10^{-7}

Putting in the values we get:

1.45\times 10^{-7}=\frac{(0.056\times \alpha)^2}{(0.056-0.056\times \alpha)}

(\alpha)=0.0016

[H^+]=c\times \alpha

[H^+]=0.056\times 0.0016=8.96\times 10^{-5}  

Thus [H^+] of 0.056 M HF solution is 8.96\times 10^{-5}

8 0
3 years ago
One atom of silicon can properly be combined in a compound with
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