All categories

3 years ago

What is the percent cr, by mass, in the steel sample? express your answer numerically as a percentage?

2 answers:

8 0

Given:3.40g sample of the steel used to produce 250.0 mLSolution containing Cr2O72−

Assuming all the Cr is contained in the BaCrO4 at the end.
(0.145 g BaCrO4) / (253.3216 g BaCrO4/mol) x (250.0 mL / 10.0 mL) x (1 mol Cr / 1 mol BaCrO4) x (51.99616 g Cr/mol / (3.40 g) = 0.219 = 21.9% Cr

lbvjy [14]3 years ago

3 0

3.40g example of the steel used to deliver 250.0 mL Solution containing Cr2O72−

Expecting all the Cr is contained in the BaCrO4 toward the end.

(0.145 g BaCrO4)/(253.3216 g BaCrO4/mol) x (250.0 mL/10.0 mL) x (1 mol Cr/1 mol BaCrO4) x (51.99616 g Cr/mol/(3.40 g)

= 0.219 = 21.9% Cr

Further Explanation:

Chromium (cr):

Chromium is a compound component with the image Cr and nuclear number 24. It is the primary component in gathering 6. It is a steely-dim, radiant, hard and weak progress metal. Chromium is the principle added substance in tempered steel, to which it includes hostile to destructive properties.

Characterization of chromium:

Classification: Chromium is a progress metal

Color: silver-dark

Nuclear weight: 51.996

State: solid

Softening point: 1907 oC, 2180 K

synthetic properties of chromium:

Chromium is a radiant, fragile, hard metal. Its shading is silver-dark and it tends to be profoundly cleaned. It doesn't discolor in air, when warmed it borns and structures the green chromic oxide. Chromium is unsteady in oxygen, it quickly creates a meager oxide layer that is impermeable to oxygen and secures the metal underneath.

Subject: chemistry

Level: High School

Keywords: Chromium (cr), Characterization of chromium, synthetic properties of chromium.

Related links:

Learn more about evolution on

brainly.com/question/5325748

brainly.com/question/7035326

You might be interested in

If 45.0 mL of ethanol (density = 0.789 g/mL) initially at 8.0 ∘C is mixed with 45.0 mL of water (density = 1.0 g/mL) initially a

strojnjashka [21]

Answer : The final temperature of the mixture is, $22.14^oC$

Explanation :

First we have to calculate the mass of ethanol and water.

$\text{Mass of ethanol}=\text{Density of ethanol}\times \text{Volume of ethanol}=0.789g/mL\times 45.0mL=35.5g$

and,

$\text{Mass of water}=\text{Density of water}\times \text{Volume of water}=1.0g/mL\times 45.0mL=45.0g$

Now we have to calculate the final temperature of the mixture.

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

$q_1=-q_2$

$m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)$

where,

$c_1$ = specific heat of ethanol = $2.42J/g^oC$

$c_2$ = specific heat of water = $4.18J/g^oC$

$m_1$ = mass of ethanol = 35.5 g

$m_2$ = mass of water = 45.0 g

$T_f$ = final temperature of mixture = ?

$T_1$ = initial temperature of ethanol = $8.0^oC$

$T_2$ = initial temperature of water = $28.6^oC$

Now put all the given values in the above formula, we get:

$35.5g\times 2.42J/g^oC\times (T_f-8.0)^oC=-45.0g\times 4.18J/g^oC\times (T_f-28.6)^oC$

$T_f=22.14^oC$

Therefore, the final temperature of the mixture is, $22.14^oC$

3 0

3 years ago

Is the process by which certain waste materials, such as plastic, glass, aluminum, and paper, are prepared for reuse.

andriy [413]

the process is called recycling.

3 0

3 years ago

Read 2 more answers

ppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppplllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll

sp2606 [1]

Answer:

YIkES One thing u can do i ask your teacher about it or say that u need help with it the cant make fun of u because u need help with your work.

8 0

3 years ago

Read 2 more answers

HELP!!!! A glass flask containing 100 milliliters of water is sealed with a rubber stopper and placed on a burner. After a while

kondor19780726 [428]

Answer: A closed system, because energy can enter or leave the container, but the water molecules cannot

Explanation:

Open system: In this system energy and matter both have access to their surroundings beyond the boundaries of system. .

Closed system :In this type system only energy has an access to its surroundings beyond the boundaries of system but not matter.

Isolated system:In this type system exchange of both energy and matter are restricted to move outside the boundaries of system.

According to question, the system given is a closed system because energy is transferred from the burner to glass flask and from the glass flask to the water (matter). But water molecules are only getting condensed on the inside surface of the flask that is exchange of matter beyond the boundaries of the system is restricted. Hence, closed system ,A closed system, because energy can enter or leave the container, but the water molecules cannot.

7 0

2 years ago

Speed of an electron to orbit radius wire linear charge density is _________

ch4aika [34]

Answer:

A long uniformly charged wire has charge density λ=0.16μλ=0.16μC/m.

7 0

3 years ago