1.How many compounds are there in 3.5 mol Be(OH)2? 2.How many grams are there in 1.2 × 10^24 molecules CO2?

3.How many grams are there in 2.1 mol H2O2?

4.How many molecules are there in 14 g N4O4?

5.How many grams are there in 1.81 x 10^24 molecules H2SO3?

6.How many moles are there in 2.4 x 10^24 molecules P2O4?

7.How many compounds are there in 1.5 mol Li2CO3?

8.How many moles are there in 1.2 x 10^24 molecules H2PO3?

Agas in a balloon at constant pressure has a volume of 160 ml at -125*c. what is its volume at 29.0*c?

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons? a) 6 b) 8 c) + 1 d) 12 e) 18