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romanna [79]
3 years ago
8

28.5g of iron shot is added to a graduate cylinder containing 45.50 mL of water. The water level rises to the 49.10 mL , From th

is information calculate the density of the iron?
Chemistry
1 answer:
Oxana [17]3 years ago
6 0
To calculate the density of an object you use the density formula which is:

D=m/v

now we plug in what we're given.

m=25.0g
v=49.10mL-45.50mL=3.6mL

D=25.0g/3.6mL=6.9 g/mL

The density of the iron is 6.9 g/mL. (btw, I left the answer in significant figures)


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Gold is alloyed (mixed) with other metals to increase its hardness in making jewelry.
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A) 54.04%

B) 13-karat

Explanation:

A) From the problem we have

<em>1)</em> Mg + Ms = 9.40 g

<em>2)</em> Vg + Vs = 0.675 cm³

Where M stands for mass, V stands for volume, and g and s stand for gold and silver respectively.

We can rewrite the first equation using the density values:

<em>3)</em> Vg * 19.3 g/cm³ + Vs * 10.5 g/cm³ = 9.40

So now we have<em> a system of two equations</em> (2 and 3) <em>with two unknowns</em>:

We <u>express Vg in terms of Vs</u>:

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  • Vg = 0.675 - Vs

We <u>replace the value of Vg in equation 3</u>:

  • Vg * 19.3 + Vs * 10.5 = 9.40
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  • 13.0275 - 19.3Vs + 10.5Vs = 9.40
  • -8.8 Vs + 13.0275 = 9.40
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Now we <u>calculate Vg</u>:

  • Vg + Vs = 0.675 cm³
  • Vg + 0.412 cm³ = 0.675 cm³
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We <u>calculate Mg from Vg</u>:

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We calculate the mass percentage of gold:

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B)

We multiply 24 by the percentage fraction:

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A water sample has a pH of 8.2 and a bicarbonate concentration of 97 mg/L. What is the alkalinity of the sample in moles/L and i
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