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Which one is the extensive property? ( )

A. density
B. pressure
C. number of moles
D. concentration

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If a mixture of 30.0 g O2 and 24.3 g Mg reacts to generate MgO, what is the total mass of the product and leftover reagent? ( )

A. 37.8 g
B. 30.3 g
C. 54.3 g
D. 56.3 g

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The empirical formula of a compound is CH2O. It is known that the molecular mass of this compound is 90.0. What is the molecular formula of this compound? ( )

A. CH2O
B. C2H4O2
C3H6O3
D. CH3CH(OH)COOH

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Which one is a strong electrolyte? ( )

A. SiO2
B. H2O
C. HNO3
D. NH3

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15  104 (52)For a process to occur spontaneously, ( )

A. the entropy of the system must increase
B. the entropy of the surroundings must increase
C. both the entropy of the system and the entropy of the surroundings must increase
D. the net change in entropy of the system and surroundings considered together must be a positive quantity

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Which one is the extensive property? ( )

A. density B. pressure C. number of moles D. concentration

If a mixture of 30.0 g O2 and 24.3 g Mg reacts to generate MgO, what is the total mass of the product and leftover reagent? ( )

The empirical formula of a compound is CH2O. It is known that the molecular mass of this compound is 90.0. What is the molecular formula of this compound? ( )

Which one is a strong electrolyte? ( )

15  104 (52)For a process to occur spontaneously, ( )

A. density
B. pressure
C. number of moles
D. concentration