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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)
P-nitrobenzenediazonium ion The p-nitrobenzenediazonium ion, which is formed in the diazotization reaction, acts as the electrophile in an electrophilic aromatic substitution a
In Heisenberg's uncertainty equation Δ x ×Δ p ≥ h/ 4 Π ; stands for: (1) Uncertainty in energy (2) Uncertainty in velocity (3) Uncertainty in momentum (4) Uncert
Determine the density of cesium chloride which crystallises in bcc type structure with the edge length 412.1 pm.The atomic masses of Cs & Cl are 133 & 35.5 respectively. Solution
importance of a heat exchanger in a chemical process and mention the different types of heat exchangers
Among the following which property is commonly exhibited by a covalent compound: (1) High solubility in water (2) High electrical conductance (3) Low boiling po
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which compound has sharp, unpleasant and pungent smell?
Another way to show that water pressure increases with depth Search a tall tin can. Punch holes up the side of the can about 3 cm apart. Put a strip of adhesive or plastic tape
need to know common methods of preparing acetone/propanone. Need to include chemical equation for reaction that produces that molecule.
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