Question

Molar mass of magnesium oxide in common value

Answer 1

ᴍᴏʟᴀʀ ᴍᴀss ɪs ᴛʜᴇ ᴍᴀss ᴏғ ᴏɴᴇ ᴍᴏʟᴇ ᴏғ ᴀ ᴄᴏᴍᴘᴏᴜɴᴅ. ᴏɴᴇ ᴍᴏʟᴇ ɪs 6.02x10^23 ᴍᴏʟᴇᴄᴜʟᴇs ᴏғ ᴛʜᴀᴛ ᴄᴏᴍᴘᴏᴜɴᴅ.

ᴛʜᴇ ғᴏʀᴍᴜʟᴀ ғᴏʀ ᴍᴀɢɴᴇsɪᴜᴍ ᴏxɪᴅᴇ ɪs ᴍɢᴏ. ᴛʜɪs ᴍᴇᴀɴs ᴇᴠᴇʀʏ ᴍᴏʟᴇᴄᴜʟᴇ ᴏғ ᴍᴀɢɴᴇsɪᴜᴍ ᴏxɪᴅᴇ ᴄᴏɴᴛᴀɪɴs ᴏɴᴇ ᴍᴀɢɴᴇsɪᴜᴍ ᴀᴛᴏᴍ ᴀɴᴅ ᴏɴᴇ ᴏxʏɢᴇɴ ᴀᴛᴏᴍ. ɪɴ ᴏʀᴅᴇʀ ᴛᴏ ғɪɴᴅ ᴛʜᴇ ᴍᴏʟᴀʀ ᴍᴀss ᴏғ ᴀ ᴄᴏᴍᴘᴏᴜɴᴅ, ʏᴏᴜ ᴍᴜsᴛ sᴜᴍ ᴛʜᴇ ɪɴᴅɪᴠɪᴅᴜᴀʟ ᴍᴏʟᴀʀ ᴍᴀssᴇs ᴏғ ᴛʜᴇ ᴀᴛᴏᴍs ᴡʜɪᴄʜ ғᴏʀᴍ ᴛʜᴀᴛ ᴄᴏᴍᴘᴏᴜɴᴅ.

ᴛʜᴇ ᴍᴏʟᴀʀ ᴍᴀss ᴏғ ᴀɴ ᴇʟᴇᴍᴇɴᴛ ɪs ᴛʜᴇ ᴀᴛᴏᴍɪᴄ ᴡᴇɪɢʜᴛ ᴏғ ᴛʜᴀᴛ ᴇʟᴇᴍᴇɴᴛ. ᴜsɪɴɢ ᴛʜᴇ ᴛᴀʙʟᴇ ʏᴏᴜ ᴘʀᴏᴠɪᴅᴇᴅ, ᴡᴇ ғɪɴᴅ ᴛʜᴇ ᴍᴏʟᴀʀ ᴍᴀssᴇs ᴏғ ᴍɢ ᴀɴᴅ ᴏ ᴀʀᴇ 24.305 ɢʀᴀᴍs/ᴍᴏʟ ᴀɴᴅ 15.999 ɢʀᴀᴍs/ᴍᴏʟ, ʀᴇsᴘᴇᴄᴛɪᴠᴇʟʏ. 

sᴏ ᴛʜᴇ ᴍᴏʟᴀʀ ᴍᴀss ᴏғ ᴍᴀɢɴᴇsɪᴜᴍ ᴏxɪᴅᴇ ɪs (24.305 + 15.999) = 40.304 ɢʀᴀᴍs/ᴍᴏʟᴇ.