chem quest 2024 (first)

For the reaction represented by the equation 2H2+O2->2H2O, how many moles of water can be produced from 6 mol of oxygen

12 mol

For the reaction represented by the equation 2Na+2H2O->2NaOH+H2, how many grams of sodium hydroxide are produced from 3.0 mol of sodium with excess water?

120 g

in the reaction represented by the equation N2+3H2->2NH3, what is the mole ratio of nitrogen to ammonia

1:2

in the reaction represented by the equation C+2H2->CH4, what is the mole ratio of hydrogen to methane

2:1

Which equation is not balanced?

2H2 + O2 --> H2O

The Haber process for producing ammonia commercially is represented by the equation N2(g) + 3H2(g) → 2NH3(g). To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen gas are required?

3.0 mol

for the reaction represented by the equation SO3 + H2O -> H2SO4, how many grams of sulfur trioxide are required to produce 4.0 mol of sulfuric acid in an excess of water

320 g

in the equation 2KClO3->2KCl+3O2, how many moles of oxygen are produced when 3.0 mol of KClO3 decompose completely

4.5 mol

The reaction represented by the equation 2Al2O3->4Al+3O2 what is the mole ratio of aluminum to oxygen

4:3

2KlO3->2KCl+3O2, How many moles of potassium chlorate are required to produce 250 g of oxygen

5.21 mol

For the reaction represented by the equation 2Fe+O2->2FeO, how many grams of iron(II) oxide are produced from 8.00 mol of iron in an excess of oxygen

575 g

For the reaction represented by the equation 2HNO3+Mg(NO3)2)+2H2O, how many grams of magnesium nitrate are produced from 8.00 mol of nitric acid, HNO3, and an excess of Mg(OH)2?

593 g

CH4+2O2->CO2+2H2O, how many moles of carbon dioxide produced from the combustion of 100 g of methane?

6.23 mol

When the formula equation Fe3O4 + Al ---> Al2O3 + Fe is correctly balanced the coefficient of Fe is number

9

For the reaction represented by the equation N2 + 3H2 -> 2NH3, how many moles of nitrogen are required to produce 18 mol of ammonia?

9.0 mol

mole ratio

a conversion factor that relates the amounts in moles of any two substances involved in a chemical reaction

to balance a chemical equation, it may be necessary to adjust the

coefficients

grams to grams

g of A (1 mol A/mass of A) (equation mol of B/equation mol of A) (g of B/1 mol B)

The units of molar mass are

g/mol

moles to grams formula

mol of A (equation mol of B/equation mol of A) (g of B/ 1 mol B)

a balanced chemical equation allows one to determine the

mole ratio of any two substances in the reaction

moles to moles

moles of A (equation mol of B/equation mol of A)

What is the study of the mass relationships among reactants and products in a chemical reaction?

reaction stoichometry

the coefficients in a chemical equation represent the

relative numbers of moles of reactants and products

Which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in chemical reactions?

stoichiometry

In what kind of reaction do two or more substances combine to form a new compound?

synthesis reaction

types of reactions

synthesis, decomposition, single replacement, double replacement, combustion

a chemical equation is balanced when the

the number of atoms of each element is the same in reactants and products

For the reaction represented by the equation 2H2 + O2 -> 2H2O, how many moles of water can be produced from 6.0 mol of oxygen?

108 g

Pb(NO3))2+2KI----> PbI2+2KNO3, how many moles of lead(II) iodide are produced from 300 G of potassium iodide and an excess of Pb(NO3)2

0.904 mol

Which coefficients correctly balance the formula NH4NO2 -> N2 + H2O?

1,1,2

steps of stoichiometry

1. balance 2. grams to moles using molar mass 3. use molar ratio to determine B moles 4. convert moles to grams with molar mass