query: SELECT ?chem ?chemLabel ?mass
  WHERE
  {
    ?chem wdt:P31 wd:Q11173;
            wdt:P2067 ?mass;
    FILTER(?mass < 1500 && ?mass > 1400).
    BIND(?mass AS ?mass).
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE]". }
  }