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1. A compound whose empirical formula is CH3 has a molar mass of 30 g/mol. What is its molecular formula? (3 points)
2. Find the molecular formula for each of the following compounds: (6 points) a) 30.5% nitrogen; 69.5% oxygen; molar mass of 46 g/mol NO2 N2O4 N3O6 N5O10 N7O14 b) 2.67 g of carbon; 0.22 g of hydrogen; 7.11 g of oxygen; molar mass of 90 g/mol Hint: Start by calculating the empirical formula. 3. A gas sample of 17.0 g is constituted of 15.8 g of carbon, the rest being hydrogen. Given that the sample?s volume is 4.9 L at NTP conditions, calculate the molecular formula for this compound.(5 points) 4. A compound is constituted by mass of 22.6% phosphorus, the rest being chlorine. Given that a volume of 307 mL of the gas has a mass of 1.55 g at 25 ?°C and 90 kPa, find the molecular formula for this compound. (5 points) 5. A compound is constituted by mass of 52.1% carbon and 13.1% hydrogen, the rest being oxygen. Given that a volume of 5.33 L of this gas has a mass of 11.5 g at 13 ?°C and 110 kPa, find the molecular formula for this compound. (5 points)
what are alkanes
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factors influencing chemical shift
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THERMOCHEMISTRY The enthalpy changes associated with reaction are dependent upon the temperature. They are also dependent upon the amounts, and the pressure and states of the r
Q. What do you mean by electro-magnetic radiation? In the untimely twentieth century scientists accepted the idea that an atom consisted of a massive positively charged nucleus
Principal quantum number of an atom represents : (1) Size of the orbital (2) Spin angular momentum (3) Orbital angular momentum (4) Space orientation of the orbital
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Product Development And Evaluation Processed food is gaining importance as "commercial commodity". It becomes more evident when we see the wide range of packaged food product
Low value of electrode potential(Mn3+/Mn2+) for scandium shows Sc3+ is stable while comparitively low value of electrode potential(Mn3+/Mn2+) for vanadium shows Vn2+is stable.Why?
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