Find the mass of urea (CH4N2O) needed to prepare 48.1 g of a solution in water in which the mole fraction of urea is 7.58×10−2. Express your answer with the appropriate units.

1.solid

2.carbon dioxide

3.helium

no statements shown

the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl