题目内容

How many significant figures in 1.0070? ( )

A. 2
B. 3
C. 4
D. 5

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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

Which is the formula for the hydroxide ion? ( )

A. OH-
B. H2O
C. H3O+
D. HCl

Which is the formula for the acetic acid? ( )

A. HCl
B. HAc
C. HNO3
D. HF