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ss7ja [257]
4 years ago
14

When determining the mass of product used or reactant consumed, the number of moles must be determined before comparing two subs

tances because a) moles react. b) atoms have the same mass but moles are different for each substance. c) different substances have different masses due to their atomic make-up. d) masses are the same for different substances.
Chemistry
2 answers:
maria [59]4 years ago
8 0

Answer:

it is NOT moles react. Just got it wrong on test

Explanation:

FromTheMoon [43]4 years ago
7 0

Answer:

moles react.

Explanation:

In a chemical reaction equation, we know that chemical species react in moles. It is actually the moles of the individual chemical species that participate in a chemical reaction and not the masses of those species.

In solving stoichiometric problems, it is mandatory to use moles as a conversion factor in calculating the mass of product formed or the mass of reactant consumed. We often read off the number of moles that reacted from the balanced reaction equation and then convert the reacting mass of species given to the number of moles of that specie that actually participated in the reaction in order to obtain any required information from a reaction.

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Determine the number of moles of C5H12 that are contained in 357.4 g of the compound.
AlladinOne [14]

Answer: 4.96 moles

Explanation:

C5H12 is the chemical formula for pentane, the fifth member of the alkane family.

Given that,

number of moles of C5H12 = ?

Mass in grams = 357.4 g

Molar mass of C5H12 = ?

To get the molar mass of C5H12, use the atomic mass of carbon = 12g; and Hydrogen = 1g

i.e C5H12 = (12 x 5) + (1 x 12)

= 60g + 12g

= 72g/mol

Now, apply the formula

Number of moles = Mass / molar mass

Number of moles = 357.4g / 72g/mol

= 4.96 moles

Thus, 4.96 moles of C5H12 that are contained in 357.4 g of the compound.

4 0
3 years ago
A solution of HCl has a concentration of 3.4 x 10-3 M. What would be the [OH-] of this solution?
Debora [2.8K]

Answer:

a

Explanation:

uffvyffvfvf

7 0
3 years ago
Which statements accurately describe Ernest Rutherford’s experiment? Check all that apply.
Sunny_sXe [5.5K]

Answer:

The positive particles were deflected due the concentrated positive charge of the atom

Explanation:

Rutherford concluded that the positive particles were deflected through an angle greater than 90 due to electrostatic force of repulsion between the particles and positive part of the atom.

3 0
3 years ago
Read 2 more answers
A ball is moving at a speed of 6.70 m/s. If the kinetic energy of the ball is 3.10 J, what is the mass of the ball?​
Anni [7]

Answer:

<h2>0.14 kg</h2>

Explanation:

The mass of the ball can be found by using the formula

m =  \frac{2k}{ {v}^{2} }  \\

v is the velocity

k is the kinetic energy

From the question we have

m =  \frac{2(3.10)}{ {6.70}^{2} }  =  \frac{6.20}{44.89}  \\  = 0.138115...

We have the final answer as

<h3>0.14 kg</h3>

Hope this helps you

7 0
3 years ago
How many different elements are there in the formula AgNO3
kotegsom [21]

Answer:

3

Explanation:

Ag

N

O

6 0
3 years ago
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