Which salt shows the least solubility change when the temperature is increased from 0 to 100 c?
2 answers:
Correct answer: NaCl (sodium chloride)
Solubility of a salt is the amount of salt in grams that can be dissolved in 100 mL of water at a particular temperature. The solubility curve shows the amount of a particular salt that can be dissolved in 100 mL of water at different temperatures. For most of the salts, solubility increases as the temperature raises. But there are some ammonium salts, the solubility decreases as the temperature is increased. Sodium chloride is the salt whose solubility remains unaffected as the temperature increases from
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Answer: The empirical formula is .
Explanation:
The chemical equation for the combustion of hydrocarbon having carbon, hydrogen and oxygen follows:
where, 'x', 'y' and 'z' are the subscripts of Carbon, hydrogen and oxygen respectively.
We are given:
Mass of = 12.24 g
Mass of = 2.505 g
Molar mass of carbon dioxide = 44 g/mol
Molar mass of water = 18 g/mol
For calculating the mass of carbon:
In 44g of carbon dioxide, 12 g of carbon is contained.
So, in 12.24 g of carbon dioxide, = of carbon will be contained.
For calculating the mass of hydrogen:
In 18g of water, 2 g of hydrogen is contained.
So, in 2.505 g of water, = of hydrogen will be contained.
Mass of oxygen in the compound = (5.287) - (3.338+0.278) = 1.671 g
Step 1 : convert given masses into moles.
Moles of C =
Moles of H=
Moles of O=
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For C =
For H =
For O =
The ratio of C : H : O = 3: 3: 1
Hence the empirical formula is .