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26 May 2022

1. Which of the following samples contains the greatest number of molecules?
2. 1 g phosphorus, P4                                                 1 g nitrogen, N2
3. 1 g chlorine, Cl2                                                                  1 g sulfur, S8

 

7 How may Na ions (Na+) are present in 0.500 mol NaOH?

1. 20 x 1023                                                                     C. 3.01 x 1023
2. 51 x 1023                                                            D. 6.02 x 1023

 

1. Acetic acid, the acid present in vinegar, has the empirical formula of CH2 If the Molar mass of the acid is 60 g/mol, what is its molecular formula?
   1. 2CH2O                C2H2O2                                C. CH4O                      D. C2H4O2

 

1. The limiting reagent in a chemical reaction is one that:

     A.is consumed completely.                                                 

1. has the smallest coefficient.
2. has the smallest molar mass (formula weight).
3. has the largest molar mass (formula weight).

 

10.Which of the following statements is TRUE for the chemical equation given        below in which nitrogen gas reacts with hydrogen gas to form ammonia gas        assuming the reaction goes to completion?

                                       N2 + H2      →    NH3

1. The reaction of three moles of hydrogen gas will produce 34 g of ammonia.
2. One mole of N2 will produce one moles of NH3.
3. One mole of nitrogen produces  02 x 1023 molecules of ammonia.
4. The reaction of one mole of H2 will produce 1/2 moles of NH3.