It's about 0.0000004 times as heavy as The CN Tower
In other words, 50 kilograms is 0.000000424050 times the weight of The CN Tower, and the weight of The CN Tower is 2,358,200 times that amount.(a.k.a. La Tour CN, a.k.a. Canadian National Tower, a.k.a. Canada's National Tower) (Toronto, Canada)
The CN Tower weighs approximately 117,910,000 kilograms. The Tower is home to the world's highest glass floor — a viewing area that allows visitors to look straight down 342 m (1,120 ft) to the ground below.
It's about 0.0000003 times as heavy as The Sears Tower
In other words, 50 kilograms is 0.00000024780 times the weight of The Sears Tower, and the weight of The Sears Tower is 4,036,000 times that amount.(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 201,800,000 kilograms. The outer wall surface of the Tower is covered with black anodized aluminum panels which would total 110,000 sq. m (28 acres) if laid out together.
It's about 0.0000002 times as heavy as The Empire State Building
In other words, 50 kilograms is 0.0000001510 times the weight of The Empire State Building, and the weight of The Empire State Building is 6,620,000 times that amount.(New York City, New York)
The Empire State Building weighs approximately 331,000,000 kilograms. About 4% of the building's weight is its 6,000 cu. m (200,000 cu. ft) of limestone façade.
It's about 10,000,000 times as heavy as a Grain of Sand
In other words, 50 kilograms is 11,000,000 times the weight of a Grain of Sand, and the weight of a Grain of Sand is 0.0000000910 times that amount.(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.00000440 kilograms. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15.10 m (49.55 ft) in height.
It's about 15,000,000 times as heavy as a Sesame Seed
In other words, 50 kilograms is 13,700,000 times the weight of a Sesame Seed, and the weight of a Sesame Seed is 0.0000000730 times that amount.(Sesamum indicum)
A sesame seed weighs approximately 0.000003640 kilograms. The McDonald's Big Mac sandwich, which is well-known for its sesame seed top bun, accounts for the consumption of an estimated 2,009.32 kg of sesame seeds each day.
It's about 0.00000006 times as heavy as The Golden Gate Bridge
In other words, 50 kilograms is 0.00000006210 times the weight of The Golden Gate Bridge, and the weight of The Golden Gate Bridge is 16,100,000 times that amount.(San Francisco, California and Marin County, California) (Post 1986 weight reduction; total weight of bridge, anchorage, and approaches)
Following the completion of the 1986 project to eliminate excess material, the total weight of the Golden Gate Bridge — including its anchorages and approaches — is 805,000,000 kilograms. The two main cables in the spanning the bridge are spun out of a total of 129,000 km (80,200 mi) of wire.
It's about 80,000,000 times as heavy as a Grain of Sugar
In other words, the weight of a Grain of Sugar is 0.00000001250 times 50 kilograms.(a.k.a. white sugar, a.k.a. white refined sugar, a.k.a. table sugar, a.k.a. sucrose, a.k.a. saccharose)
A grain of sugar weighs approximately 0.0000006250 kilograms. Sugar consumption varies widely by country; the average citizen of the United States consumes about 61.2 kg of sugar each year.