1. How many grams of O2 are needed to produce 0.400 mole Fe2O3? 2. How many grams H2O are produced when 35.8 g C3H8 react by the following equation?
C3H8 + 5 O2 → 4 H2O + 3 CO2

3. Given the following reaction: Al2(SO4)3 + 6 NaOH → 2 Al(OH)3 + 3 Na2SO4
a. What mass of Al(OH)3 is produced if 22.7 g of NaOH is consumed?

4. Given the balanced equation: 3 CuS + 8 HNO3 → 3 Cu(NO3)2 + 3 S + 2 NO + 4 H2O
a. What number of molecules of NO is produced when 8 grams of S is produced?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

Based on its chemical properties, identify the position of each chemical family on the periodic table.

Apush or pull that moves or changes and object when to objects touch