Blog

@X@user.full_name@X@ @GMU: The average speed of O3 molecules (atoms) was 470.5 m/s. What was the temperature of the gas?

@X@user.full_name@X@ @GMU: A compound contains only magnesium and astatine. A sample weighing 52.1 g of this compound contained 2.85 g of magnesium. How many grams of astatine would there be in another sample of this compound containing 7.79 g of magnesium?

@X@user.full_name@X@ @GMU: How many moles of He are in a 150.18 L tank at 38.35°C and 1.807 atm?

@X@user.full_name@X@ @GMU: Draw the Lewis dot structure of PCl5. How many lone-pairs of electrons (first) and bonding pairs of electrons exist on the molecule PCl5?

@X@user.full_name@X@ @GMU: What unit does the abbreviation ‘1 ms’ stand for?

@X@user.full_name@X@ @GMU: What is the molar heat capacity of Au if it took 19.178 J to increase the temperature of 16.91 g of it by 8.789°C?

@X@user.full_name@X@ @GMU: The average speed of HBr molecules (atoms) was 406.9 m/s. What was the temperature of the gas?

@X@user.full_name@X@ @GMU: A 55.63 mL sample of 0.2425 M HCN was neutralized by exactly 37.63 mL of Mg(OH)2. What was the molarity of Mg(OH)2?2HCN(aq) + Mg(OH)2(aq) → Mg(CN)2(aq) + 2H2O(l)

@X@user.full_name@X@ @GMU: A compound contains only beryllium and astatine. A sample weighing 129 g of this compound contained 2.71 g of beryllium. How many grams of astatine would there be in another sample of this compound containing 8.59 g of beryllium?

@X@user.full_name@X@ @GMU: How many milliseconds are there in 34.70 deciseconds?