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New ocr b chemistry help

What volume of 0.250 mol dm–3 sodium hydroxide solution should be diluted to 1000 cm3 to make
a 0.0100 mol dm–3 solution?
A 40 cm3
B 50 cm3
C 80 cm3
D 160 cm3

Which one??


(b) In a pilot plant making ammonia, NH3, 200 cm3 of nitrogen are mixed with 300 cm3 of
hydrogen.
What would be the final volume (at the same temperature and pressure) if complete
reaction occurs?

A 200 cm3
B 250 cm3
C 300 cm3
D 400 cm3
Your answer

Which one??

Help would be much appreciated!

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