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-Dominant- [34]
3 years ago
15

How many moles of lithium metal would need to react with excess oxygen gas to produce 4 moles of lithium oxide in the following

reaction?
4Li + O2 → 2Li2O (My answer: C)


1

2

4

8
Chemistry
2 answers:
Oduvanchick [21]3 years ago
6 0
4Li + O₂ = 2Li₂O

Li : Li₂O = 4 : 2 = 2 : 1

2 : 1
x : 4

x=4*2/1=8 mol

D) 8
meriva3 years ago
6 0

Answer: The correct answer is 8.

Explanation: For the following equation:

4Li(s)+O_2(g)\rightarrow 2Li_2O(s)

As oxygen gas is in excess, so lithium metal is considered as the limiting reagent because it limits the formation of product.

By Stoichiometry,

2 moles of lithium oxide is produced by 4 moles of Lithium

So, 4 moles of lithium oxide will be produced by = \frac{4}{2}{\times 4 = 8 moles of lithium metal.

So, the correct answer is 8.

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3. If all the waves were measured for a period of 5 seconds, which wave had the highest frequency?
Vanyuwa [196]

Answer:

Correct answer is A.

Explanation:

Frequency is the number of oscillations that a wave have per unit time. Since time is measured in seconds, the wave with the highest frequency must register the highest number of oscillation per second. Hence, correct answer is A.

8 0
3 years ago
An empty vial weighs 55.32 g. (a) If the vial weighs 185.56 g when filled with liquid mercury (d = 13.53 g/cm3). What i its volu
Tasya [4]

Answer:

a) Volume of vial= 9.626cm3

b) Mass of vial with water = 62.92 g

Explanation:

a) Mass of empty vial = 55.32 g

Mass of Vial + Hg = 185.56 g

Therefore,

mass\ of\ Hg = 185.56-55.32 = 130.24 g

Density of Hg = 13.53 g/cm3

Volume\ of\ vial = Volume\ of\ Hg = \frac{Mass}{Density} \\\\= \frac{130.24g}{13.53g/cm3} = 9.626 cm3

b) Volume of water = volume of vial = 9.626 cm3

Density of water = 0.997 g/cm3

Mass\ of\ water = Density*volume = 0.997g/cm3*9.626cm3=9.60 g\\\\Total\ Mass\ of\ vial = Empty\ vial + mass\ of\ water\\= 53.32+9.60= 62.92g

3 0
3 years ago
Evaluate importance:<br> - Why does a patch of garbage in the ocean effect humans on land?
andrew-mc [135]

Why does a patch of garbage in the ocean effect humans on land

3 0
2 years ago
HELP ME AGAIN FOR BRAINLIEST
oksano4ka [1.4K]

Answer:

1: C

2: a

3: B

4: D

hope this helps

7 0
3 years ago
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