Solid aluminum (Al) and oxygen (O₂) gas react to form solid aluminum oxide (Al2O3). Suppose you have 2.0 mol of Al and 7.0 mol of O₂ in a reacto Could half the Al react? If you answered yes, calculate how many moles of Al2O3 would be produced after half the Al was used up. Round your answer to the nearest 0.1 mol. yes O no mol X

MOLES/MOLECULES T04/s02 If a sample of HNO, is found to contain 8.15 · 1020 o atoms how many moles of N atoms are present? Express your answer in scientific notation. Molar Mass (g/mol) HNO3 63.013 N atom H atom O atom Avogadro's No. (mol-1) 6.022x1023 14.007 1.0080 15.999 x 10

1. N2 + 3H2 → 2NH3 How many moles of hydrogen, H2, are needed to react with 2.0 moles of nitrogen, N2? 6 mol H2 O 5 mol H2 O 7 mol H2 O 12 mol H2

7. Consider the following reaction: Al(SO4),+ Na,PO, Na,SO, AIPO, If 2 moles of aluminum sulfate are mixed with excess sodium phosphate, how many moles of precipitate are formed? 8. A) B) C) DJ 2 mol 3 mol 4 mol 6 mol The molar mass of a compound is determined experimentally to be 180 g/mol. If its empirical formula is CH,O, its molecular formula will be: A) C₂H₂O₂ B) CH..O, C) C₂H₂O₂ D) C₂H₂O, 9. Which of the following would NOT precipitate the CO, ion? A) Co B) H C) Mg D) Ba 3 of 8

In this question below, what is the unit of the answer? What is the mass of iron (Fe) can be obtained from 3.80 g iron (III) oxide (Fe203) reacting with excess carbon monoxide (CO)? O g Fe203 O g co O Fe O g CO2 O mole Fe203 O mol co O mol Fe O mole CO2 O particles Fe203 O molecules cO O atoms Fe O molecules CO2

For the chemical reaction 2 NaOH + H₂SO4 Na₂SO4 + 2H₂O what mass of sodium sulfate is produced from 3.29 mol of sodium hydroxide?

Calculate the number of moles of NH3 that result when 5.56 mol of H2 combines with 2.35mol of N2.   i'm so lost in chemistry and I have a test on tuesday and this was the first question on the review packet and it'd be really appreciated if someone could write out the steps to this.

According to the balanced reaction below calculate the moles of NH3 that form when 4.2 mol of N2H4 cpmpletely react. 3N2H4(l)-->4NH3(g)+N2(g) Im not sure where to even start with how to solve this,pleasehelp.

A student obtained 11.4 g of PbSO4 from the following reaction. The student added 15 g of Lead (II) nitrate to 15 g of Sodium sulfate. Pb(NO3)2 + Na2SO4 --> PbSO4 + 2NaNO3 What is the percent yield of the PbSO4 the student obtained from the reaction?  % Make sure that you show your work for all questions, including units and labels being cancelled within the stoichiometry work itself and units and labels on your final answer. write it out as

Multiple choice questions 8 to 13