题目内容

Which one is the molecular compound? ( )

A. NaBr
B. (NH4)2SO4
C. O2
D. NO

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The isotopic composition of naturally occurring boron includes boron-10 and boron-11. Which statement is correct? ( )

A. There is much more boron-10 than boron-11
B. There is slightly more boron-10 than boron-11
C. The boron-10 and boron-11 are almost equal
D. There is much less boron-10 than boron-11

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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 the molecular compound? ( )

A. NaBr B. (NH4)2SO4 C. O2 D. NO

The isotopic composition of naturally occurring boron includes boron-10 and boron-11. Which statement is correct? ( )

Which one is the extensive property? ( )

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? ( )

A. NaBr
B. (NH4)2SO4
C. O2
D. NO