A number placed in front of an element symbol

The molar mass of magnesium (Mg) is 24.30 g/mol. There are 6.02 1023 atoms in 1 mol. How many atoms are present in 48.60 g of Mg? 3.32 10^-24 atoms 1.96 10^-21 atoms 1.20 10^24 atoms 7.11 10^26 atoms

A force of 45 n is exerted on an object, resulting in an acceleration of 5 m/s2 for the object. what will the object's acceleration be if the force doubles? a. 2.5 m/s2 b. 5 m/s2 c. 10 m/s2 d. 20 m/s2

What type of bond do the fatty acids in unsaturated fats have? A. all single carbon-to-carbon bonds B. at least one double carbon-to-carbon bond C. carbon bonds that vary depending on temperature D. no carbon-to-carbon bonds

The total pressure inside a 1.43L cylinder at 28 degrees is 1.03 atm. If the temperature drops to - 35 degrees, and the volume remains the same, what is the new temperature inside the cylinder?

Which pair of elements will have a similar valence shell electron configuration?

An animal that backs on a warm rock during the morning hours but retreats to the shade of the rocks during the middle of the day is mostly likely a (n) A. ectotherm B. endotherm C. vertebrate D. chordate

How much water vapor can a cubic meter of air hold at 25 degrees celcius

When 0.50 L of a 12 M solution is diluted to 1.0 L, what is the resulting molarity?

A 52.9g sample of brass, which has a specific heat capacity of 0.375·J·g-1°C-1, is put into a calorimeter (see sketch at right) that contains 100.0g of water. The temperature of the water starts off at 15.0°C.

What is the concentration of 10.00 mL of HBr if it takes 16.73 mL of a 0.253 M LiOH solution to neutralize it?