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Science Clinic => Chemistry => Topic started by: sc00by25 on Mar 21, 2021

Title: On another planet, boron has two isotopes as follows: Isotope Mass (amu) Natural Abundance (%) ...
Post by: sc00by25 on Mar 21, 2021

Question 1

Nitric oxide, NO, is made from the oxidation of NH₃, and the reaction is represented by the equation:

4NH₃ + 5O₂→ 4NO + 6H₂O

A 9.3-g sample of NH₃ gives 12.0 g of NO. The percent yield of NO is _____.

◦ 78%
◦ 59%
◦ 46%
◦ 73%
◦ 18%

Question 2

On another planet, boron has two isotopes as follows:

       Isotope                         Mass (amu)                            Natural Abundance (%)

       Boron-10                     10.0129                                   80.00

       Boron-11                     11.0093                                   20.00

Estimatethe average atomic mass of boron on this planet.

◦ 10.0 amu
◦ 11.0 amu
◦ 10.5 amu
◦ 10.8 amu
◦ 10.2 amu

Title: On another planet, boron has two isotopes as follows: Isotope Mass (amu) Natural Abundance (%) ...
Post by: nickk12214 on Mar 21, 2021

Answer 1

73%

Answer 2

10.2 amu