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3 years ago

5

What is the Relative Formula Mass of Potassium bromide?

1 answer:

Aleonysh [2.5K]3 years ago

6 0

The relative formua for Potassium bromide is Kbr

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9.44 x 10^3 In standard form

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9440 is standard form.

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The empirical formula of styrene is CH; find the % composition for H and CH. How many atoms are present in a 2.00 gram sample of

lina2011 [118]

% Composition = ?
no atom in 2 g of styrene =?
molar mass of strene =104.15
% composition of c= 12/13.008 =.922*100=92.2
% composition of h =1.008/13.008=0.0774*100= 7.74

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3 years ago

You have 15.42g of C2H6. How many moles of H2O can be made?

Amiraneli [1.4K]

<u>Answer:</u> The moles of water produced are 1.54 moles.

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of ethane = 15.42 g

Molar mass of ethane = 30.07 g/mol

Putting values in above equation, we get:

$\text{Moles of ethane}=\frac{15.42g}{30.07g/mol}=0.513mol$

The chemical equation for the combustion of ethane follows:

$2C_2H_6+5O_2\rightarrow 4CO2+6H_2O$

By Stoichiometry of the reaction:

2 moles of ethane produces 6 moles of water

So, 0.513 moles of ethane will produce = $\frac{6}{2}\times 0.513=1.54mol$ of water

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4 years ago

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7nadin3 [17]

I think c may be your anwser but im not too sure :/ srry if u get it wrong!

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