and ean only get the 4 points for this question if you have filled in your usern
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and ean only get the 4 points for this question if you have filled in your username on the bubble and you completely and darkly fill in the bubbles. The an this sheet for your own reference. heswar you fill in on your bubble sheet is the one that will count. You should circle the ame: periodic You may use b You ean only n this page nstitutes ac following on the bubble sheet: Completely darken the bubbles Do you understand and this?Check to make absolutely certain that you have correctly bubbled in the ayes username (the ISU email) 2. What tis the speed in m/sec (meter per second) of a car traveling at 70 miles per hour? I mile 1.609 km) a. 1.6×10-5 m/sec b. 3.1 x 10' m/sec . 3.1 x 102 m/sec d.) 4.1 × 105 m/sec 2A 3. Gallium has two naturally occurring isotopes, 69Ga with a mass of 68.925574(1) amu and 71Ga with mass of 70.924701(1) amu. The average atomic mass of gallium is 69.723(1) amu. The percent abundances of the gallium isotopes are %69Ga and %71Ga. 75 a. 60. I 1 % 69Ga, 39.89% 71Ga b, 38.89% 69Ga, 60.11% 71Ga c. 6.11% 69Ga, 93.89% 71Ga d. 0.61% 69Ga, 99.39% 71Ga 4. The combustion of manganese with oxygen results in an oxide which has the molar mass of 86.9 g/mol (atomic masses of manganese and oxygen are 54.9 and 16.0 g/mol, respectively). What is the formula of the expected oxide? a. MnO c. Mn02 5. Carbon forms a compound with hydrogen called methane, CHs. Which element, X, do you expect to form a compound with formula XH4? a. X=AlExplanation / Answer
2.
70 mile/hr *(1.609 km/1mile)*(1000 m/1km)*(1hr /3600sec) = 31.29 m/sec
answer: c
3. average atomicmass of Ga = (69-Ga mass*percentage + 71-Ga mass*percentage)/100
69.723 = (68.9255*x+70.9247*(100-x))/100
x = 60.11
69-Ga = 60.11%
71-Ga = 100-60.11 = 39.89%
answer: a
4. from the molarmass of oxide,
it is clear that,
it has 1 Mn-atom, 2 - O atoms
answer: C
5. answer: b . X = si , (because both C,Si are same group elements)
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