Question

If the mass of Mars is 6.42 x 1023 kg, what is the mass in pounds?

(Given: 1 lb = 454 g)

Please include steps to solve, thanks!

Answer 1

Ans. Given,

                        1 lb = 454 g

                        Mass of Mars = 6.42 x 10²³ kg

We know,       1 kg = 1000 g

                        Or, 1 g = 0.001 kg

Now,

                        1 lb = 454 g = 454 (0.001 kg) = 0.454 kg

                        Or, 1 kg = (1 / 0.454) lb = 2.2026 lb

                        So, 1 kg = 2.2026 lb

# Mass of Mars = 6.42 x 10²³kg

                                    = (6.42 x 2.2026) x 10²³ lb           

                                    = 14.141 x 10²³ lb

                                    = 1.41 x 10²⁴ lb

Note: Suppose a value = 2X            

If X = 10 mL,

            Then, value = 2X = 2 (10 mL) = 20 mL     ; where X is replaced by its specified value.

# Similarly,

            1 lb = 454 g = 454 (0.001 kg) = 0.454 kg            ; where, “g” can be treated equivalent to variable “X” whose value is 0.001 kg. The same approach is opted for making calculation- it excludes unnecessary writing of various values again and again.