There is going to be a lot of these questions so keep a look out plz

How many moles are in 250 grams of tungsten (w)? * 4.4x10^23 moles 4.2x10^23 moles 0.7 moles 1.4 moles

Calculate - analysis of compound composed of iron and oxygen yields 174.86 of fe and 75.14g of o. what is the empirical formula for this compound?

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false