53cr protons neutrons electrons 1.52 x10^24 atoms of au is how many moles 53cr protons neutrons electrons

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Chapter 1 Significant Figures and Equations Conversions and density and significant figures Cubic centimeter (cc) = ml Celsius plus 273.15 = kelvin 1in = 2.54cm 1000g = 1kg1ml = 1cc (cm ) 3 2 2 2 2 -9 2 15.2 cm  km 15.2 * (1m/100cm) * (1km/1000m) = 1.52 x 10 km 3 3 3 3 5.4 g/ml  Kg/m (1kg/1000g) (1ml/1cm ) (100cm/1m) = 5.4 x 10 Density d = M/V Rules for sig figs 1. Nonzero digits are always significant 2. Zeroes are sometimes significant 0.123 has 3 0.000123 has 3 3. Zeros at end are significant