Search & Filtering
) If you need to make a 0.5mol/L solution of your product (assuming it is soluble in water), what would be the mass of the product needed?
One of the essential minerals in the human body is salt. How much salt (NaCl) is in the average adult human body?
Lysozome is an enzyme that breaks bacterial cells. A solution containing 150 mg lysozome in 210 mL of solution has an osmotic pressure of 0.953 torr at 25.0°C. Determine the molar mass of lysozome.
Camphor (C10H16O) melts at 179.8°C and has a large freezing point depression constant, Kf = 40.00°C. m–1 . When 186.0 mg of an unknown nonvolatile, non-electrolyte compound is dissolved in 22.01 g of liquid camphor, the freezing point of the mixture was found to be 176.7°C. What is the molar mass of the unknown compound?
The [H+] of a solution is 4.2 x 10^-3. Which equation should you use to calculate pH?
. Single choice.
What is the specific heat of aluminum if the temperature of an 85.2g sample of aluminum is increased by 24.3º, when 621J of heat is added?
Hydrogen peroxide is a powerful oxidizing agent that is used in concentrated solution in rocket fuels and dilute solution as a hair bleach.
A 30% by mass of H2O2 solution has a density of 1.11g/ml. Calculate it's morality, mole fraction of H2O2, and molarity.
The enthalpy of formation of NH3(g) as per the following reaction is -46.11 kJ/mol
at 298 K. NE(g) + 3H2(g) ----> 2NH3(g)
Calculate the value of enthalpy of formation of NH2(g) at 100°C. The Cp(J/K/mol)
values are given as: N2(g) = 29.12; H2(g) = 28.82; NH3(g) = 35.06. Assume the
given heat capacity values to be temperature independent in the range.
- It requires two sticks of butter to make a batch of 20 cookies. How much butter will it take to make 150
cookies?
1) In a saturated solution of Zn(OH)2 at 25°C, the value of [OH-] is 2.0 x 10-4 M. What is the value of the solubility-product constant, Ksp, for Zn(OH)2 at 25°C ? Explain
A)4.0 x 10, -18
B)8.0 x 10, -12
C)4.0 x 10-12
D)2.0 x 10-4
2) CaF2(s)⇄Ca2+(aq)+2F−(aq) Ksp=4.0×10−10
The concentration of F−(aq) in drinking water that is considered to be ideal for promoting dental health is 4.0×10−5M. Based on the information above, the maximum concentration of Ca2+(aq) that can be present in drinking water without lowering the concentration of F−(aq) below the ideal level is closest to
- 0.025 M
- 1.6 x 10-15 M
- 1.6 x 10-6 M
- 0.25 M
*EXPLAIN*
