Verizon 6:13 PM a session.masteringchemistry.com Homework Set #2 Item 3 3 of 14

Question

Verizon 6:13 PM a session.masteringchemistry.com Homework Set #2 Item 3 3 of 14 Keeping track of units during conversions can get confusing. Therefore, a good strategy is to use dimensional analysis. In dimensional analysis, unit factors are used to cancel out unwanted units and leave the desired units Consider the following example: How many football fields could fit on a 1 mile stretch of land? Here are the relevant conversion factors 1 football field 100 yards 1 mile 5280 ft !yard = 3 ft Then 5280.K x 1 .pd × otballfield- 17.6 football fields 100 Part A The conversion factor relating miles to meters is 1 mile = 1610 m. The speed of light is 3.00 108 m/s. How fast is this in miles per hour (miles/h)? View Available Hint(s) miles/h Submit Part B The conversion factor relating feet to meters is 1 ft 0.305 m. Keep in mind that when using conversion factors, you want to make sure that like units cancel leaving need you with the units you You have been told that a certain house is 164 m in area. How much is this in square feet? View Available Hint(s) ft Submit Provide Feedback Next >

Explanation / Answer

11. A. Protons, electrons and neutrons are present in nucleus

B. Mass number (A) = No of protons + No of neutrons

No of protons = Atomic Number

So, mass number = 9+8 = 17

C. Atomic Number = Mass number - no of neutrons

= 30-16 = 14

D. No of neutrons = Mass number - atomic number = 37-17= 20

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