12g of magnesium ribbon was heated in a crucible. At the end of the reaction 20g of magnesium oxide had been produced. What mass of oxygen had reacted with the magnesium?

This line graph compares the growth of plants that were kept in the sun for different amounts of time.a)  on day 7, the plants kept in the sun for 3 hours were how tall? b)  on day 7, the plants kept in the sun for 6 hours were how tall? c)    on day 10, the plants kept in the sun for 9 hours were how tall? d)  on day 11, the plant that was grown with 1 hour of sunlight was how tall? e)  based on the graph, the plant grows best in what amount of sunlight?

In all living cells dna controls cellular activities by

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form