Question

THE NUMBER OF MOLES OF sodium hydroxide in 25cmcube of 0.5moldmcube of its solution

Answer 1

Answer:

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Answer 2

Base equation

concentration

=

moles

volume

(in dm

3)

Here

concentration

=

0.2 M

volume

=

25 cm

3

=

(25

1000)

=

0.025 dm3

moles

= x

Therefore

0.2

=

x

0.025

Multiply by

0.025

on both sides to leave

x

by itself

−

0.2

×

0.025

=

x

x

=

0.005 moles

=

5

×

10

−

3

moles