1. Stan walk 15 km west to the grocery store he shops then walk back 20km east to his house what distance did he cover what was his displacement

100mg magnesium reacts with 20ml of 1.0m hcl

Problem page gaseous ethane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water . if of water is produced from the reaction of of ethane and of oxygen gas, calculate the percent yield of water. be sure your answer has the correct number of significant digits in it.

Which statement about the stamps is correct?