Tin-126 has a half-life of 100,000 years. How many years does it take to reduce a 100 g of Sn-126 to 12.5 g?

What is the name of this hydrocarbon?

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

Determine the reaction and balance the following equations urgent due in the morning