9 g•L-1NaCl solution is isotonic solution, put the normal red blood cells into the following salt water, which can cause hemolysis? ( )
A. 9 g•L-1 salt water
B. 5 g•L-1salt water
C. 10 g•L-1salt water
D. 15 g•L-1salt water
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The osmolarity of a hypertonic solution is ( ).
A. greater than 320 mmol•L-1
B. 280-320 mmol•L-1
C. less than 280 mmol•L-1
How many significant figures in 1.0070? ( )
A. 2
B. 3
C. 4
D. 5
What is the concentration of a solution by diluting 25 mL of 3 mol/L HCl to a total volume of 50 mL? ( )
A. 1.5 mol/L
B. 3 mol/L
C. 4.5 mol/L
D. 5 mol/L
How many moles of NaOH is present in 120 g? ( ). (molar mass of NaOH is 40 g/mol)
A. 1 mol
B. 2 mol
C. 3 mol
D. 4 mol