1.To the correct number of significant figures,what is the m

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1.To the correct number of significant figures,what is the mass of 2.5 moles deuterium gas(isotope mass=2.014 amu)?
A.5.035g
B.5.0g
这个有效数字究竟是按2位算还是4位算?但是根据乘法有效数字的计算法则,不是应该是2位吗?
2.A nearly equal volume of NaOH solution and acid are have been added.
判断正误?答案说是错误的.我的疑惑在于：首先我没看懂这句话的意思,其次这句话怎么判断?
Dropper pipette:Used to add small amounts of liquid to a solution,but only when a precise volume is not needed {because the drops themselves should be consistent only for one particular dropper (i.e.adding an indicator,comparing the amount of drops of strong acid or base needed for a pH change in different solutions)}
根据乘法有效数字的计算法则，不是取有效数字位数少的吗？

1 你拿2.014和2.5乘,根据乘法有效数字的计算法则,不应该得出4位有效数字吗?
2i.e.adding an indicator,comparing the amount of drops of strong acid or base needed for a pH change in different solutions
是说要你用指示剂,因为 pipette本身不精确.加强精确度.
判断正误.不懂.

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