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lianna [129]
3 years ago
13

Please help with this chemistry question, image attached.

Chemistry
1 answer:
koban [17]3 years ago
8 0

Answer:

The answer to your question is 0.67 moles of Glucose

Explanation:

Data

120 g of Glucose

convert to moles

Process

1.- Calculate the molar mass of Glucose

C₆H₁₂O₆ = (12 x 6) + (1 x 12) + (16 x 6)

              = 72 + 12 + 96

              = 180 g

2.- Remember that the molar mass of each molecule equals 1 mol. Use the rule of three to find the answer.

                        180 g ------------------- 1 mol

                         120 g ------------------ x                    

                         x = (120 x 1)/180

                         x = 120/180

                         x = 0.67 moles

3.- Conclusion

120 g of Glucose are equal to 0.67 moles.

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H+ ions
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3 years ago
How many moles of copper (Cu) are in 65.8 g Cu?
Veseljchak [2.6K]
<h2><u>Answer:</u></h2>

The correct answer is A) 1.04 mol Cu

{65.8 g     /   63.55 g/mol}

= 1.04 mol Cu

Explanation:

In  63.55  g  of copper metal there are  1 m o l  of  C u  atoms. By dividing the mass of Cu and molar mass, we can easily get the number of moles.


5 0
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. How many grams of water would require 4400 joules
Alja [10]

Answer:

The specific heat of water is 4.18 J/g C.

Explanation:

q

=

m

C

s

Δ

T

Never forget that!

2200

=

m

⋅

4.18

J

g

⋅

°

C

⋅

66

°

C

∴

m

≈

8.0

g

5 0
3 years ago
What is the standard electrode potential for a galvanic cell constructed in the appropriate way from these two half-cells?
____ [38]

E

θ

Cell

=

+

2.115

l

V

Cathode

Mg

2

+

/

Mg

Anode

Ni

2

+

/

Ni

Explanation:

Look up the reduction potential for each cell in question on a table of standard electrode potential like this one from Chemistry LibreTexts. [1]

Mg

2

+

(

a

q

)

+

2

l

e

−

→

Mg

(

s

)

−

E

θ

=

−

2.372

l

V

Ni

2

+

(

a

q

)

+

2

l

e

−

→

Ni

(

s

)

−

E

θ

=

−

0.257

l

V

The standard reduction potential

E

θ

resembles the electrode's strength as an oxidizing agent and equivalently its tendency to get reduced. The reduction potential of a Platinum-Hydrogen Electrode under standard conditions (

298

l

K

,

1.00

l

kPa

) is defined as

0

l

V

for reference. [2]

A cell with a high reduction potential indicates a strong oxidizing agent- vice versa for a cell with low reduction potentials.

Two half cells connected with an external circuit and a salt bridge make a galvanic cell; the half-cell with the higher

E

θ

and thus higher likelihood to be reduced will experience reduction and act as the cathode, whereas the half-cell with a lower

E

θ

will experience oxidation and act the anode.

E

θ

(

Ni

2

+

/

Ni

)

>

E

θ

(

Mg

2

+

/

Mg

)

Therefore in this galvanic cell, the

Ni

2

+

/

Ni

half-cell will experience reduction and act as the cathode and the

Mg

2

+

/

Mg

the anode.

The standard cell potential of a galvanic cell equals the standard reduction potential of the cathode minus that of the anode. That is:

E

θ

cell

=

E

θ

(

Cathode

)

−

E

θ

(

Anode

)

E

θ

cell

=

−

0.257

−

(

−

2.372

)

E

θ

cell

=

+

2.115

Indicating that connecting the two cells will generate a potential difference of

+

2.115

l

V

across the two cells.

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2 years ago
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lilavasa [31]

Answer: The mass of the sample will be 1417.7 grams.

Explanation:

We are given:

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So, 30.2 kJ of heat is require for a mass 58.44 grams of NaCl

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5 0
3 years ago
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