Having a family history involving anxiety disorder, experiencing or witnessing a traumatic event, or having a history of abuse are all
of anxiety disorders
A common symptoms
Brisk factors
C. causes
D. thinking styles

2.4 x 10^21 First, calculate the number of moles of carbon you have by dividing the mass (in grams) by the atomic weight of carbon. Atomic weight of Carbon = 12.0107 0.047 g / 12.0107 g/mol = 0.003913 mole Now multiply by avogadro's number 0.003913 * 6.0221409 x 10^23 = 2.35646 x 10^21 Since you only have 2 significant figures, round the result to 2 significant figures 2.4 x 10^21