Element X has two isotopes. If 72.0% of the element has an isotopic mass of 84.9 atomic mass units, and 28.0% of the
element has an isotopic mass of 87.0 atomic mass units, the
average atomic mass of element X is numerically equal to
o (72.0 - 84.9) (28.0 + 87.0)
o (72.0 x 84.9) + (28.0 x 87.0)
o (72.0 + 84.9) (28.0 + 87.0)
o (72.0 x 84.9) (28.0 x 87.0)
+
100
100

no, the red giant is the hottest with 2.00.000.000 degrees celsius. while the white dwarf only 25,000 degrees celsius.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.