How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP??

If 3.00 g of titanium metal is reacted with 6.00 g of chlorine gas, cl2, to form 7.7 g of titanium (iv) chloride in a combination reaction, what is the percent yield of the product?

Identify and describe the three ways that mutations affect organisms.

What is the value of the standard enthalpy of formation of an element in its most stable form?