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marta [7]
3 years ago
15

What is the mass of iron contained in 100g of an iron ore?

Chemistry
1 answer:
anzhelika [568]3 years ago
3 0
It depends on which iron ore it is.
The most common form is Fe2O3
Molar mass o iron =  55.85
Molar Mass of Oxygen = 16 

So mass of iron i Fe2O3  = (2*55.85)  * 100/ (2*55.85 + 3*16) = 69.9 g
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COLLEGE CHEMISTRY 35 POINTS
Sati [7]

6.81% is the percent yield when 12 g of CO2 are formed experimentally from the reaction of 0.5 moles of C8H18 reacting with excess oxygen.

Explanation:

Data given:

mass of carbon dioxide formed = 12 grams (actual yield)

atomic mass of CO2 = 44.01 grams/mole

moles of C_{8} H_{18} = 0.5

Balanced chemical reaction:

2 C_{8} H_{18} + 25 O_{2} ⇒ 16 CO_{2} + 18 H_{2} _O{}

number of moles of carbon dioxide given is

number of moles = \frac{mass}{atomic mass of 1 mole}

number of moles= \frac{12}{44}

number of moles of carbon dioxide gas = 0.27 moles

from the reaction 2 moles of C_{8} H_{18} reacts to produce 16 moles of CO_{2}

So, when 0.5 moles reacted it produces x moles

\frac{16}{2} = \frac{x}{0.5}

x = 4

4 moles of carbon dioxide formed, mass from it will give theoretical yield.

mass  = number of moles x molar mass

mass = 4 x 44.01

        = 176.04 grams

percent yield =\frac{actual yield}{theoretical yield} x 100

percent yield = \frac{12}{176.04} x 100

     percent yield  = 6.81 %

8 0
3 years ago
_______ is a media that consists of natural or synthetic mineral or plant substances that deposit crystalline or splinter-like f
diamong [38]

Answer : Option A) Dry media


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iii) Ink Painting - Uses various inks on the paper.


iv) Liquid media - uses liquid pigments suspended in some base which in liquid state that soaks the paper.

3 0
3 years ago
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statuscvo [17]
<span>Compounds whose colours are sensitive to pH are best defined as.......Acid-base indicators.</span>
4 0
4 years ago
Viết cấu hình electron nguyên tử các nguyên tố có số electron từ 1 đến 10
Dmitry [639]

Explanation:

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5 0
3 years ago
An object has a weight of 5.10 Newtons (N) at sea level, where the acceleration due to gravity is 9.81 m/s2.
RUDIKE [14]
Well, you could get the mass as m=\frac{G_0}{g_0} ad then g_1=\frac{G_1}{m}, where G_0 is the sea level weight, g_0 the sea level accel., g_1 the accel. above while G_1 the weight above.
8 0
3 years ago
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