Question

A certain compound contains 78.54% carbon and 21.46% hydrogen. How much carbon is in a 3.44 g portion of this sample?

Answer 1

2.70 grams

Step-by-step explanation:

78.54% of the compound is carbon, so in a 1 gram sample, there would be 0.7854 grams of carbon since 78.54% * 1 = 0.7854. Similarly, we multiple 78.54% by 3.44 to get the mass of carbon in a 3.44 gram sample.
78.54% * 3.44 = 0.7854 * 3.44 = 2.701776, but only leave 3 digits because otherwise it would be false accuracy