Science Homework Help

How many grams of potassium chlorate must be decomposed to generate 30.0 g of oxygen?

What mass of oxygen is needed to oxidize 125 g of iron to iron(III) oxide?

Some cars can use butane (C4H10) as fuel. How many kilograms of oxygen are needed for the complete combustion of each kilogram of butane? Hint: the setup begins with one kg of butane.

What mass of anhydrous copper(II) sulfate (CuSO4) can be obtained by heating 125 g of copper(II) sulfate pentahydrate (CuSO45H2O)? Hint: the other product is water.

Calculate the mass percent of potassium nitrate in each of the following solutions:
a) 2.51 g of KNO3 in 47.49 g of water

b) 4.22 kg of KNO3 in 51.43 kg of water

It is desired to prepare exactly 100.00 mL of sodium chloride solution. If 2.71 g NaCl is weighed out, transferred to volumetric flask, and water added to the 100-mL mark, what is the molarity of the resulting solution?

What volume (in mL) of 0.1008 M silver nitrate would be required to react completely with 0.0541 g or copper metal? Note: the copper product contains the copper(II) ion.

What is the percent yield of the reaction between 5.2 mL of 0.1233 M barium nitrate and 4.9 mL of 0.1256 M sodium sulfate if 0.140 grams of the precipitate are produced?

Acetylene (C2H2) burns in oxygen for form carbon dioxide and water. How many liters of carbon dioxide (at STP) are formed when 25.0 L of acetylene is burned at STP?

Acetylene (C2H2) burns in oxygen for form carbon dioxide and water. How many moles of carbon dioxide can be produced when 15.0 L of oxygen at STP reacts with 25.0 grams of acetylene?