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What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

What’s the percent by mass of carbon in c10h14n2

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.