From the periodic table:
mass of oxygen = 16 grams
mass of calcium = 40 grams
mass of carbon = 12 grams
mass of CaCO3 = 40 + 12 + 3(16) = 100 grams
Therefore, each 100 grams of CaCO3 contains 3 moles of oxygen
To know the number of oxygen moles in 25.45 grams, we will simply do cross multiplication as follows:
number of oxygen moles = (25.45 x 3) / 100 = 0.7636
Answer:
A. when dissolved in water
Explanation:
Water is an extremely polar molecule, meaning it has a positive end a negative end. When an ionic compound is dissolved, the positive pole of water will be attracted to the negative ion and attach itself to it. The same goes for the positive ions. That's how water breaks down ionic compounds
Answer:
Oxygen exists as a diatomic molecule in nature when it is not combined with any other element. It forms O2 molecule because it is stable when it is uncombined. ... By achieving octet configuration, the diatomic elements become more stable compared to the single atom. Therefore, oxygen and hydrogen are diatomic.
Explanation:
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Answer:
The enthalpy of the reaction is -2855.622 kilo Joules.
Explanation:
We are given:
The equation used to calculate enthalpy of reaction :
![\Delta H^o_{rxn}=\sum [n\times \Delta H^o_f(product)]-\sum [n\times \Delta H^o_f(reactant)]](https://tex.z-dn.net/?f=%5CDelta%20H%5Eo_%7Brxn%7D%3D%5Csum%20%5Bn%5Ctimes%20%5CDelta%20H%5Eo_f%28product%29%5D-%5Csum%20%5Bn%5Ctimes%20%5CDelta%20H%5Eo_f%28reactant%29%5D)
The equation for the enthalpy change of the above reaction is:
Putting values in above equation, we get:
![\Delta H^o_{rxn}=[4 mol\times (-393.5 kJ/mol)+6 mol\times (-241.826 kJ/mol)]-[2 mol\times (-84.667 kJ/mol)+7 mol\times 0 kJ/mol]](https://tex.z-dn.net/?f=%5CDelta%20H%5Eo_%7Brxn%7D%3D%5B4%20mol%5Ctimes%20%28-393.5%20kJ%2Fmol%29%2B6%20mol%5Ctimes%20%28-241.826%20kJ%2Fmol%29%5D-%5B2%20mol%5Ctimes%20%28-84.667%20kJ%2Fmol%29%2B7%20mol%5Ctimes%200%20kJ%2Fmol%5D)
The enthalpy of the reaction is -2855.622 kilo Joules.
<span>a. More N2O4 is produced.
As all species are gases, over more pressure, the side of the reaction with fewer gas molecules will be favoured as it is the one that occupies less space, where more molecules would fit in lesser space. N</span>₂O₄ has the same number of atoms of 2NO₂, but the difference is that they are only in one molecule - occupy less space because all the atoms are closer to each other.
