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Mice21 [21]
3 years ago
10

ithium metal reacts with water to give lithium hydroxide and hydrogen gas. if 75.5 mL of hydrogen gas is produce at STP, what is

the mass of lithium metal that reacted?
Chemistry
2 answers:
netineya [11]3 years ago
7 0
The reaction would written as:

2Li + 2H2O = 2LiOH + H2

We are given the amount in volume of the hydrogen gas that is produced. Assuming that this gas is an ideal gas, we use the relation that in every 1 mol of gas, 22.4 L is being occupied.

75.5 mL ( 1 L / 1000 mL ) ( 1 mol / 22.4 L ) = 0.0034 mol H2 produced

0.0034 mol H2 ( 2 mol Li / 1 mol H2 ) ( 6.941 g / mol ) = 0.0472 g Li is needed
Galina-37 [17]3 years ago
6 0
The reaction equation may be written as:
2Li + 2H₂O → 2LiOH + H₂

A single mole of gas occupies 22,400 ml of gas at STP. Therefore, the moles of hydrogen gas are
75.5 / 22,400 = 0.0034 mol
According to the equation, the moles of lithium are twice that of hydrogen gas; thus,
0.0034 x 2 = 0.0068 mol

The mass of lithium is given by:
mass = moles x atomic mass
mass = 0.0068 x 6.9
mass = 0.047 grams
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Which diagram shows the correct direction of electron flow in an electrolytic cell?
Alborosie

Answer:

A

Explanation:

4 0
2 years ago
When trying to determine whether or not an atom gives up electrons easily, do chemists look at electronegativity or ionization p
Archy [21]
Here I found some info at Yahoo answers: https://answers.yahoo.com/question/index?qid=20090119191941AAB7oAb
The more electronegative an atom is the more unwilling it is to lose its electrons in a compound. If you do try to take a very EN atom away from a compound you'll need to apply a lot of energy for that to happen. I can give an example of a single atom though 

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4 0
3 years ago
What is the total number of liters of SO3 produced when 32.0 of SO2 reacts completely
ahrayia [7]
Write  the   chemical  equation   for  reaction
that  is  
2SO2+O2  --->2SO2

find  the   moles  of  SO2   used  =  moles=mass/molar mass  of  so2

=  32g/80g/mol=0.4 moles

by  use  of  reacting  ratio  between  SO2   and  SO3   which   is   2:2  therefore  the  moles  of  so3  is  also =  0.4  moles

STP  1 mole  =  22.4L.
what  about  0.4moles

= 0.4 /1 x22.4=8.96 liters
4 0
3 years ago
2<br> CuCl2 +4KI -&gt; 2 Cul + 4 KCI + 12
Amanda [17]

Answer:

Explanation:

This is an example of a limiting reactant question, and is very common as a general chemistry problem.

We first see the balanced equation, that is:

2CuCl2+4KI→2CuI+4KCl+I2

We first need to find the limiting reactant

We see that 0.56 g of copper(II) chloride (CuCl2) reacts with 0.64 g of potassium iodide (KI) . So, let's convert those amounts into moles.

Copper(II) chloride has a molar mass of

134.45 g/mol . So in 0.56 g of copper(II) chloride, then there exist

0.56g134.45g/mol≈4.17⋅10−3 mol

Potassium iodide has a molar mass of

166 g/mol . So, in 0.64 g of potassium iodide, there exist

if it wrong i am sorry

5 0
3 years ago
Only a professional scientist can benefit from scientific knowledge.<br><br> True<br><br> False
svet-max [94.6K]
The answer is False ... Anyone can benefit form <span>scientific knowledge. Thank about your Health</span>
4 0
3 years ago
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