A student burned 0.250 g of magnesium metal in an open crucible. Oxygen from the air combined with the metal forming magnesium oxide. If 0.421 g of magnesium oxide were produced, what mass of oxygen combined with the metal? 1. 0.171 g 2. 0.671 g 3. 1.684 g 4. 0.594 g

0.171 grams of oxygen combined with the metal.

Explanation:

Mass of magnesium oxide produced = 0.421 g

Mass of magnesium metal used = 0.250 g

Suppose reaction completely converts the magnesium into magnesium oxide.

Mass of oxygen combined with magnesium = m

0.421 g = 0.250 g + m

m =  0.421 g - 0.250 g = 0.171 g

0.171 grams of oxygen combined with the metal.

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock

im doing test rn im going with 2 but ill give answer if itss wrong,   : )