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3 years ago

How many grams in 120 moles of iron (Fe)?

Chemistry

1 answer:

beks73 [17]3 years ago

4 0

Answer:

Mass = 6702 g

Explanation:

Given data:

Number of moles of iron = 120 mol

Mass of iron = ?

Solution:

Formula:

Number of moles =mass/molar masa

Molar mass of iron = 55.85 g/mol

By putting values,

120 mol = mass/ 55.85 g/mol

Mass = 120 mol ×55.85 g/mol

Mass = 6702 g

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evablogger [386]

The answer is; D,

Because these rocks cool slowly, the rocks are able to form large crystals hence giving the rock a coarse texture. These crystals are big enough to be viewed with the unaided eye. The opposite is extrusive rocks that form on the surface of the earth. These cool rapidly and form fine-grained textured rocks because of the small crystals formed during the rapid cooling process.

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3 years ago

A liquid has a density of 0.87g/ml. What volume is occupied by 25g of liquid

irga5000 [103]

Answer:

29 mL

Explanation:

<h3>Equation</h3>

The question needs us to find the volume of the liquid. The equation for volume using density and mass is:

Volume = Mass / Density

<h3>Solve</h3>

We can substitute the given values for density and mass into the equation:

$V=\frac{25\ g}{0.87\ g/ml}$

$V\approx29\ mL$

<h3>Additional Comments</h3>

The answer we obtained (29 mL) is rounded to two significant figures. When multiplying or dividing, the amount of significant figures in the final answer is always the least amount of significant figures in one of the values.

Below are the significant figure rules:

Nonzero digits will always be significant (eg. 54 --> 2 significant figures)

Zeroes at the beginning of a number will never be significant (eg. 0.1 --> 1 significant figure)

Zeroes between two nonzero digits will always be significant (eg. 504 --> 3 significant figures)

Zeroes following a number will always be significant if the number contains a decimal point (eg. 40.0 --> 3 significant figures)

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2 years ago

White gold is used in jewelry and contains two elements, gold and palladium. A jeweler has two different samples that are both i

wlad13 [49]

Solution : As they have uniform composition throughout they are considered as homogeneous mixture. Both samples are mixture of two metals (gold and palladium) thus are alloys.

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2 years ago

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David's body breaks down the sandwich into small enough molecules that can be absorbed through his intestinal lining and then in

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break down food into smaller molecules the body can use; absorb molecules into blood and carry them throughout the body; eliminate wastes from the body

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3 years ago

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Igoryamba

Answer:

$\large \boxed{\text{e. 15.4 mol C$_{3}$H}_{8}}$

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3 years ago