How many of each type of atom are there in the formula (NH4)2HPO4? A) N = 2, H = 9, P = 1, O = 4 B) N = 1, H = 5, P = 1, O = 4 C) N = 2, H = 5, P = 1, O = 4 D) N = 2, H = 8, P = 1, O = 4 E) none of the above

Problem 2-75 only

Practice #3 2# 2# Element Symbol Charge +, 0,- Protons Neutrons electrons Carbon-13 Hydrogen-2 1 He 24 - Nitrogen 7 7 16 Охудеn 8 0.8 11 12 12 List any ions of an element from the table List any isotopes of an element from the table 6p 4e 11p 12n 13e 7n 7e 13+ 14 n Ions? How many different elements are pictured above? acer

Problem 4-20 Based on the following word descriptions, write the formula for each of the indicated substances. a. a compound whose molecules contain twice as many oxygen atoms as carbon atoms b. a compound whose molecules contain an equal number of carbon and oxygen atoms c. a compound in which there is an equal number of calcium and carbon atoms, but there are three times as many atoms of oxygen as of the other two elements d. a compound whose molecules contain twice as many hydrogen atoms as sulfur atoms and four times as many oxygen atoms as sulfur atoms е. a compound in which there are twice as many chlorine atoms as barium atoms f. a compound in which there are three sulfur atoms for every two aluminum atoms