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3 years ago

How many grams of kno3 pellets must be dissolved in water in order to prepare 100 ml of a 8 m kno3?

1 answer:

Montano1993 [528]3 years ago

4 0

In 8M of KNO3, there are x moles of KNO3 divided by (100/1000)L of water (because molarity is concentration, given by no. of moles divided by total volume in liters).

by changing the subject of formula, x = 0.1L × 8M = 0.8mol

given the no. of mol of KNO3, mass of KNO3 is given by no. of mol multipled by the relative molecular mass of KNO3.

mass = 0.8mol × 101.10g/mol (or whatever your periodic table says) = 80.88g

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Explanation:

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In this case, since the Ka is lower than 1, we infer the reverse reaction is favored since the reactant (acetic acid) will tend to have a higher concentration.

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In this case, since the Ka is lower than 1, we infer the reverse reaction is favored since the reactant (aluminium hydroxide) will tend to have a higher concentration.

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Enthalpy of combustion of ethyl alcohol, C2 H5 OH, is – 950 kJ mol–1. How much heat is evolved when one gram of ethyl alcohol bu

melomori [17]

<h3>Answer:</h3>

20.62 Kilo-joules

<h3>Explanation:</h3>

The Enthalpy of combustion of ethyl alcohol is -950 kJ/mol.
This means that 1 mole of ethyl alcohol evolves a quantity of heat of 950 Joules when burned.

Molar mass of ethyl ethanol = 46.08 g/mol

Therefore;

46.08 g of C₂H₅OH evolves heat equivalent to 950 kilojoules

We can calculate the amount of heat evolved by 1 g of C₂H₅OH

Heat evolved by 1 g of C₂H₅OH = Molar enthalpy of combustion ÷ Molar mass

= 950 kJ/mol ÷ 46.08 g/mol

= 20.62 Kj/g

Therefore, a gram of C₂H₅OH will evolve 20.62 kilo-joules of heat

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