Which of the following is representative of Standard Temperature and Pressure
A. 1 atm, 273 K
B. 1,000 mmHg, 273 K
C. 1 atm, 298 K.
D. 760 mmHg, 273 °C

The Standard Temperature and Pressure is 1 atm, 273 K

Explanation:

STP is Standard Temperature and Pressure

Standard temperature is characterized as zero degrees Celsius (0°C), or 273.15 degrees Kelvin (273.15 K). This is the point of solidification of water at sea level, in the air at standard pressure.

Standard Temperature is

                             0° C in Celsius or 273 K in Kelvin

Standard Pressure is 1 Atm, 101.3kPa or 760 mmHg or torr. STP is the "standard" condition regularly utilized for estimating gas density and volume.

Standard Pressure is

                               1 Atmosphere (atm)

                               760 Torricelli's (torr)

                               760 Millimeters of Mercury (mmHg)

                               101.325 KiloPascals (kPa)

Ur e n d is not real

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.