Hello
Is the second sentence rephrased correctly?
Accurately weigh 2.5 ± 0.2g of Sample into a glass stoppered 100 ml Erlenmeyer flask.
Accurately put 2.5 ± 0.2g of sample into a 100 ml Erlenmeyer glass flask which is covered by a stopper.
Thanks
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Asked and answered here:
https://www.usingenglish.com/forum/threads/265883-Weigh-into-meaning