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2 years ago

2Li +H₂0= LiOH+H₂ balance the equation

Chemistry

1 answer:

Irina-Kira [14]2 years ago

7 0

2Li+2H2O=2LiOH+H2

We need to make number of the atoms of each reactant(the elements from the left side)equaled to the products(the elements from the right side)

Li is 2 on the left side so in order to make it balanced we add a 2 in front of LiOH.

For the H2O we take a look at the right side there are 2 atoms from H2 and 2 atoms of H for 2LiOH therefore we have 4 atoms of H in the right side and only 2 in the left side.So,to make them equal we will add a 2 in front of H2O.

Hope,I explained well.

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Perform the following calculations and give your answer with the correct number of significant figures:

GarryVolchara [31]

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2 years ago

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the heat of fusion of acetone is 5.7 kJ/mol. Calculate to two significant figures the entropy change when 6.3 mol of acetone mel

shtirl [24]

Answer: The entropy change of the process is $2.0\times 10^2J/K$

Explanation:

To calculate the entropy change for different phase at same temperature, we use the equation:

$\Delta S=n\times \frac{\Delta H_{f}}{T}$

where,

$\Delta S$ = Entropy change

n = moles of acetone = 6.3 moles

$\Delta H_{f}$ = enthalpy of fusion = 5.7 kJ/mol = 5700 J/mol (Conversion factor: 1 kJ = 1000 J)

T = temperature of the system = $-94.7^oC=[273-94.7]=178.3K$

Putting values in above equation, we get:

$\Delta S=\frac{6.3mol\times 5700J/mol}{178.3K}\\\\\Delta S=201.4J/K=2.0\times 10^2J/K$

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3 years ago

How many moles are in 8.2 x 10^22molecules of N2I6?

stiks02 [169]

Answer:

First, find out how many moles of N2I6 you have. Then convert that to grams.

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moles N2I6 = 8.2x1022 molecules N2I6 x 1 mole/6.02x1023 molecules = 1.36x10-1 moles = 0.136 moles

grams N2I6 = 0.136 moles x 789 g/mole = 107 g = 110 g (to 2 significant figures)

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2 years ago

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Answer:

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3 years ago

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stiv31 [10]

Answer:

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number of C moles

Required O2 moles (According to the mole ratio )

Relevant to the first equation, find the moles the KClO3, which is used to produce that amount of O2 moles

Now you can find the mass of KClO3

I mentioned the useful steps which can guide you to get the answer.

Explanation:

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2 years ago

2Li +__H₂0= __LiOH+H₂ balance the equation

2Li +H₂0= LiOH+H₂ balance the equation