Vocabulary
Math
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Limiting reactants/Hygroscopic molecules
100

limiting reactant

reactant than runs out first and determines amount of product

100

How many moles is 100.0 grams of silicon

3.560 moles

100

mass of  0.12 moles of potassium chloride (KCl)

 8.9 g

200

hydrated

a compound that has absorbed water

200

How many molecules exist in 10.0 grams of aluminum chloride (AlCl3)?

4.52x10^22 molecules

200

A chemist is using the following reaction 2Al (s) + 3CuSO4 (aq) -> Al2S3O12 (aq) + 3Cu (s) to make copper (Cu). If he uses 100.0 grams of aluminum and excess CuSO4 , how many grams of copper can he make?

353.3 g

300

anhydrous

form of a hygroscopic compound without water

300

mass of 1.761 moles of ethanol (C2H6O)

81.15 g.

300

How many moles is 500.0 grams of glucose (C6H12O6)

s 2.775 moles

300

The hydrate of sodium carbonate (Na2CO3) has ten water molecules for every sodium carbonate molecule. Write the chemical formula of hydrated sodium carbonate.

Na2CO3 ?10H2O

400

stoichiometry

relating amounts of reactants and/or products

400

A chemist is running the following chemical reaction: 4NH3 + 5O2 -> 4NO + 6H2O If she wants to make 15.0 g of water, how much NH3 does she need?

9.46 g

400

Consider the following reaction: 3NaOH (aq) + H3PO4 (aq) -> Na3PO4 (aq) + 3H2O (l) How many grams of H3PO4 (aq) are necessary to make 100.0 moles of water?

3,266 g

400

A chemist is making hydrogen according to the following chemical equation: Mg (s) + 2HCl (aq) -> MgCl2 (aq) + H2 (g) If he adds 15 moles of HCl (aq) to an excess of Mg (s), how many moles of H2 (g) will he make?

7.5 moles

500

hygroscopic

readily absorbing moisture, even from environment

500

A chemist has 5.0?1025 molecules of ammonia (NH3). How many moles is that? How many grams is that?

 83 moles and 1,400 g.

500

2Na + S + 2O2 -> Na2SO4


If you want to make 10.0 moles of Na2SO4

a. How many moles of sodium would you need? b. How many moles of sulfur would you need? c. How many moles of oxygen would you need?

20.0 moles, 10.0 moles, 20.0 moles

500

The hydrate of sodium carbonate (Na2CO3) has ten water molecules for every sodium carbonate molecule.If you have 50.0 grams of the anhydrous form, how many grams of water can it absorb?

85.1 g

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