Upon heating a sample of NiCl2•6H2O, a sample originally weighing 3.5 g yields an anhydrous salt residue weighing 2.1g. What is the percent by mass of water in the hydrate?

Percent by mass = 40%

Explanation:

Mass of Compound before heating = 3.5g

Mass of compound after heating = 2.1g

Mass of water present = 3.5g - 2.1g = 1.4g

Percent by mass = ( Mass of water /  Mass of compound ) x 100

Percentage by mass = (1.4 / 3.5) x 100

Percent by mass = 0.4 x 100

Percent by mass = 40%

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

honesty and integrity.

inspire others.

commitment and passion.

good communicator.

decision-making capabilities.

accountability.

delegation and empowerment.

creativity and innovation.

here are the traits of a good leader.i'm not going to give you the examples so you can copy right it.that's illegal but i hope that this you out.