What cash crop became prevalent during the mid 1800s USA? 

@X@user.full_name@X@ @GMU: The average speed of HCl molecules (atoms) was 719.9 m/s. What was the temperature of the gas?

@X@user.full_name@X@ @GMU: What is the atomic number of an element if the mass of one atom is 1.995e-23 g?

@X@user.full_name@X@ @GMU: The average speed of H2S molecules (atoms) was 654.2 m/s. What was the temperature of the gas?

@X@user.full_name@X@ @GMU: What is 2.70 °C on the Fahrenheit scale?

@X@user.full_name@X@ @GMU: Construct a molecular orbital energy diagram of Be2. What is its bond order?

@X@user.full_name@X@ @GMU: Construct a molecular orbital energy diagram of C22-. What is its bond order?

@X@user.full_name@X@ @GMU: A 27.70 mL sample of H2SeO4 was neutralized by exactly 34.90 mL of 0.1618M Ca(OH)2. What was the molarity of H2SeO4?H2SeO4(aq) + Ca(OH)2(aq) → CaSeO4(aq) + 2H2O(l)

@X@user.full_name@X@ @GMU: Suppose an element consists of two isotopes having masses of 78.80 amu and 80.11 amu. The abundance of the first isotope is 24.87%. What is the average molecular mass?

@X@user.full_name@X@ @GMU: What is the molar heat capacity of Na if it took 14.205 J to increase the temperature of 15.31 g of it by 7.543°C?