I have a sample of seawater from the open ocean with salinity S = 35.00 at 20°C. I need help finding the concentration of magnesium ion in a seawater sample at 5°C in units of mmol/kg and also in mmol/L. Using this table, we can see that at 20 degrees Celsius, the concentration is 52.82 mmol/kg and 54.13 mM(mmol/L). The density at 5°C 1027.677 kg/m^3 and 1024.763 kg/m^3 at 20°C. The density anomaly would be 24.7896 at 20°C.

Given that the molar mass of air is 0.029 kg mol-1, standard temperature is 0 °C and standard pressure is 101 kPa, calculate: i)            the number of molecules in 0.002 m3 of air at STP.   ii)            the density of air at STP.

Problem 1: Reynold's number One can has your teeth cleaned professionally using a rotating brush or with a jet stream of a baking soda slurry. For baking soda slurries, the dentist uses a device similar to the device shown in HD Figure 8.24 to remove plaque. The fluid used in the device is a baking soda slurry. Baking soda slurry is 3.0% baking soda (sodium bicarbonate) in water, where 0.90% is the saturation limited of baking soda in water. If the inlet velocity is 0.24 m/s with inlet diameter of 5.4 mm at 23°C. The nozzle tip has a diameter of 0.51 mm. Assume no frictional effects. See page 4 for sodium bicarbonate-viscosity graph. State any other assumption needed. FIGURE 8.24 Inlet Flow Outlet Flow A. What is the Reynold's number for the fluid entering the device? B. Is the flow laminar or turbulent? C. For the same mass flow rate as in part A), determine the Reynold's number if the temperature is increased to 95°C. Hint: ratios can be used. State any assumption. Laminar or…

What volume of a 4.00x10⁻²M solution of silver nitrate contains 2x10⁻² moles of nitrate ions?