Question 1
Calculate the mass of NH
4ClO
4, molar mass = 117.49 g mol
-1, required to create a temperature change of -1.0 °C in a coffee cup calorimeter containing 115 mL of water. The enthalpy of solution for NH
4ClO
4 is 33.47 kJ mol
-1. The specific heat of water is 4.184 J g
-1 °C
-1, and assume the density of the solution is 1.00 g mL
-1.
◦ 4.0 g
◦ 0.83 g
◦ 2.8 g
◦ 1.7 g
◦ 3.2 g
Question 2
Calculate the mass of sodium cyanate (NaOCN, molar mass = 65.0066 g mol
-1) required to lower the temperature from 24.1 °C to 23.0 °C in a coffee cup calorimeter containing 98 mL of water. The enthalpy of solution for NaOCN is 19.20 kJ mol
-1. The specific heat of water is 4.184 J g
-1 °C
-1 and assume the density of the solution is 1.00 g mL
-1.
◦ 3.8 g
◦ 1.5 g
◦ 4.8 g
◦ 0.75 g
◦ 1.1 g
sodium
Conditions Required for Bacterial Growth
Horizontal stroking across the lower back.
The penny shown below is covered with about 180 milligrams of sodium
Body Mass Index (IBM)
The Lower Extremities