Author: Anonymous

Lorine has a BMI of 32. She has gained 10 pounds in the first trimester of her pregnancy and her current weight is 262 pounds at 14 weeks gestation. If Lorine follows the recommended guidelines for weight gain in pregnancy, what will her expected weight be at 20 weeks gestation?

A 1.00 L buffer solution contains 0.42 M NH4Cl and 0.75 M NH3 (pKb of NH3 = 4.74 ). The solution receives 0.010 moles of HCl from an outside source.  Assuming no significant change in volume of the solution, what would be the pH of the solution after the addition of the HCl at 25°C?

The following pair of solutions result in a buffer. 165.0 mL of 0.10 M HF; 135.0 mL of 0.050 MKOH

Determine the [OH-] concentration in a 0.169 M Ca(OH)2 and the pH of the solution. Answers provided are in the order [OH-] and pH respectively.

An iron bar of mass 819 g cools from 93.0°C to 5.0°C. Calculate the metal’s heat change (in joules). Specific heat of Fe is 0.449 J/g°C 

An iron bar of mass 819 g cools from 93.0°C to 5.0°C. Calculate the metal’s heat change (in joules). Specific heat of Fe is 0.449 J/g°C 

Determine the mass of a ball with a wavelength of 3.45 × 10-34 m and a velocity of 6.55 m/s.

How much heat is absorbed when 30.00 g of C(s)(molar mass 12.01 g/mol) reacts according to the following chemical equation? 5 C(s) + 2 SO2(g)

           C6H6    +          O2        →        CO2     +          H2OWhen the above equation is balanced, the coefficient in front of the carbon dioxide molecule is:

What is the mass percent concentration of a sucrose solution made by adding 4 g of sucrose to 8 g of water?