Calculate the mass of Helppp pleaseee
hydrogen formed when 25 grams of aluminum
reacts with excess hydrochloric acid.
2Al + 6HCl + Al_C16 + 3H2
0.41 g
1.2g
1.89
2.8 g

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Which of the following units is not an official si unit

What is the molarity of the solution produced when 145 g of nacl is dissolved in sufficient water to prepare 2.75 l of solution?