- 19. Approximations deutlich
Which approximation has more than 10% error? (On exams you will always be provided with precise
values for constants and unit conversions)
a) Avogadro's number is about 1024
b) Water has a molar mass of about 20 g/mole
c) The speed of light is 3 x 108 m/s
d) The gas law constant is 8 J/mole K

Look at the reaction below: ca(hco3)2 --> caco3 + co2 + h2o first, balance the reaction. once balanced, use dimensional analysis or another method to find out how many moles of carbon dioxide will be produced if we start with 16.5 moles of calcium bicarbonate (calcium hydrogen carbonate). = mol of co2 number needs to be reported to three significant figures.

What are the variables in gay-lussac’s law? pressure and volume pressure, temperature, and volume pressure and temperature volume, temperature, and moles of gas

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.