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Arturiano [62]
2 years ago
5

Does the excess reactant get used up completely in a reaction??

Chemistry
1 answer:
Alex787 [66]2 years ago
4 0

Answer:

In a chemical reaction, reactants that are not used up when the reaction is finished are called excess reagents. The reagent that is completely used up or reacted is called the limiting reagent, because its quantity limits the amount of products formed.

Explanation:

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3. How many moles are in 1.49 x 1023 molecules of iodine?
tino4ka555 [31]

Answer:

<h3>The answer is 0.25 moles</h3>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

n =  \frac{N}{L}  \\

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{1.49 \times  {10}^{23} }{6.02 \times  {10}^{23} }  =  \frac{1.49}{6.02}  \\  = 0.247508305...

We have the final answer as

<h3>0.25 moles</h3>

Hope this helps you

7 0
3 years ago
Compare the nuclear charge of nitrogen to oxygen on the valance electrons.
Lera25 [3.4K]

Answer: well the the nuclear charge of nitrogen is 7

but the Oxygen is in the 6A group which means that oxygen has 6 valence electrons.

Explanation:

4 0
2 years ago
Based on the chart, determine the identity of a substance that increases in temperature by 11.4oC when 1250J of energy are added
Firdavs [7]

Answer:

LIthium vegetable oil

7 0
3 years ago
How many li are in 2.5 moles of li​
NARA [144]

Answer:

15.06 × 10²³ atoms of Li

Explanation:

Given data:

Number of moles of Li = 2.5 mol

Number of toms of Li = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

For 2.5 mol of Li:

1 mole of lithium = 6.022 × 10²³ atoms of Li

2.5 mol × 6.022 × 10²³ atoms of Li / 1 mol

15.06 × 10²³ atoms of Li

8 0
3 years ago
Brass is stronger than steel<br> True or False
Ket [755]
False . Steel is stronger
8 0
2 years ago
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