1. How many grams are in 8.00 x 1025 atoms of Ss?
2. Balance the equation for the complete combustion of butane is
_C4H10+ _02_CO2 +_H2O
a)
3. Carry out the following operation(s) and express your answer in the proper number of
significant figures. Look at the equipment.
For a) tell which is better to get a more
accurate measurement and why (briefly) b) What is this called and give uncertainty
even if you cannot read this picture... c) Name this equipment and say if TC or TD
ta
а a
b.
b
E
d. How many significant figures are in 0.0140?
e. How many H atoms are present in 144.00 grams of caffeine C8H10N4O2?

The valence of aluminum is +3, and the valence of the chlorine is -1. the formula fir the aluminum chloride is correctly written as

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.

What is the approximate mass of 25 cm3 of silver, if the density is 10.5 g/cm3? a. 0.42 g b. 2.4 g c. 42 g d. 260 g