molecular formula of magnesium oxide

{"title":"1309-48-4 Magnesium Oxide Powder Bulk Loose Powder Density 3.58 G\/Cm\u00b3 (At 25\u2103) Molecular Weight 40.30","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/5a\/fb\/fd00efa9d6fc4057003ccad6eb3c-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"JIURUNFA","Model Number":"Magnesium Oxide","Minimum Order Quantity":"1Ton","Delivery Time":"7-15 Days","Certification":"ISO9001","Place of Origin":"Shandong China","Payment Terms":"L\/C,D\/A,D\/P,T\/T","Supply Ability":"30000 Ton\/Month","Packaging Details":"25\/50KG woven bag lined with plastic bags, or according to the requirements of customers.","Refractive Index":"1.735","Thermal Conductivity":"0.25 W\/mK","Hardness":"5.5-6.5 (Mohs scale)","Model No":"Magnesium Oxide","Payment":"TT LC","Usage":"Building Board Desulphurization","Size":"200MESH&325MESH","Melting Point":"2,852 \u00b0C"}}

{"title":"High Purity 99.5 Erbium Metal Rare Earth Erbium Metal ISO Authentication","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/fd\/15\/e04ba4037669a4bae85f59863a3e-200x200-1.jpg","attrs":{"Price":"To be negotiated","Brand Name":"High Broad","Model Number":"99.9","Minimum Order Quantity":"100kgs","Delivery Time":"1MT: 10 Days","Certification":"ISO","Place of Origin":"China","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union, MoneyGram,Alipay,Credit Card,PayPal","Supply Ability":"500MT per year","Packaging Details":"Erbium metal in iron drum","Material":"Erbium block","Purity":"99.9","Formula":"Er","Density":"9.06g\/cm3","Keywords":"Top selling rare earth Erbium metal for sale price","Belongs":"Rare earth metal"}}