PLEASE HELP

lidiya [134]

Answer:

Carbon dioxide is used as a refrigerant, in fire extinguishers, for inflating life rafts and life jackets, blasting coal, foaming rubber and plastics, promoting the growth of plants in greenhouses, immobilizing animals before slaughter, and in carbonated beverages.

3 0

3 years ago

Plz help me I swear to God i will mark you brainiest

Marat540 [252]

I think it’s b hope that helped

3 0

3 years ago

Iron has many isotopes but only 4 are found in significant amounts in naturally found mixtures. The amounts by mass percent are:

AnnZ [28]

Answer:

The average mass of iron to be is 54.76 amu.

Explanation:

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$

1)

Mass of Fe-54 isotope = 53.9396 amu

Percentage abundance of Fe-54 = 5.845%

Fractional abundance of Fe-54 = 0.05845

2)

Mass of Fe-56 isotope = 55.9349 amu

Percentage abundance of Fe-56 = 91.754 %

Fractional abundance of Fe-56= 0.91754

3)

Mass of Fe-57 isotope = 56.9354 amu

Percentage abundance of Fe-57 = 2.119%

Fractional abundance of Fe-57 = 0.002119

4)

Mass of Fe-58 isotope = 57.9333 amu

Percentage abundance of Fe-58 = 0.282%

Fractional abundance of Fe-58 = 0.00282

Average atomic mass of iron :

$=53.9396 amu\times 0.05845+55.9349 amu\times 0.91754 +56.9354 amu\times 0.002119 + 57.9333 amu\times 0.00282=54.76 amu$

The average mass of iron to be is 54.76 amu.

5 0

3 years ago

Why is methanol written as ch3oh instead of ch4o?

Ahat [919]

Answer: Here comes the role of another formula, which we refer to as the structural formula and that is CH3OH for methanol. The structural formula gives us an additional information that carbon is attached to three hydrogen atoms and one oxygen atom.

3 0

3 years ago

For the reaction 2Na + 2H20 - 2NaOH + H2 how many grams of sodium hydroxide are

ololo11 [35]

Answer:

Explanation:

Moles of sodium

=

130

⋅

g

22.99

⋅

g

⋅

m

o

l

−

1

=

5.65

⋅

m

o

l

.

Now you have the stoichiometric equation:

2

N

a

(

s

)

+

2

H

2

O

(

l

)

→

2

N

a

O

H

(

a

q

)

+

H

2

(

g

)

↑

⏐

If there are

5.65

⋅

m

o

l

of metal, clearly

5.65

⋅

m

o

l

2

dihydrogen gas are evolved......, i.e.

2.83

⋅

m

o

l

H

2

. Typically, in a question like this, you would also be asked to calculate the volume the gas occupies under standard conditions, and the

p

H

of the resultant solution (would it be high, low, neutral?).

3 0

4 years ago

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