1. How many cobalt atoms are in 345 g of cobalt? 2. Calculate the molar mass of carbon tetrachloride, CCl4.

3. What's the mass of 4.23 moles of sodium chloride, NaCl?

4. Titanium has become the preferred metal for high-end bicycles because they're significantly lighter than bicycles made with iron. Explain why one mole of titanium weighs less than one mole of iron.

5. Road salt is used in northern climates by the metric ton. How many moles of calcium chloride (CaCl2) does a town use daily if it uses 1.2 metric tons a day? 1 metric ton = 1000 kilograms

Consider three unlabeled bottles, each contain small pieces of one of the following metals. - magnesium - sodium - silver the following reagents are used for identifying the metals. - pure water - a solution of 1.0 molar hcl - a solution of concentrated hno3 (a) which metal can be easily identified because it is much softer than the other two? describe a chemical test that distinguishes this metal from the other two, using only one of the reagents above. write a balanced chemical equation for the reaction that occurs. (b) one of the other two metals reacts readily with the hcl solution. identify the metal and write the balanced chemical equation for the reaction that occurs when this metal is added to the hcl solution. use the table of standard reduction potentials (attached) to account for the fact that this metal reacts with hcl while the other does not. (c) the one remaining metal reacts with the concentrated hno3 solution. write a balanced chemical equation for the reaction that occurs. (d) the solution obtained in (c) is diluted and a few drops of 1 m hcl is added. describe what would be observed. write a balanced chemical equation for the reaction that occurs.

Which type of orbits are found in the principal energy level n = 2 a - s b - s, f c - s, d d - s, p e - s, p, d

Predict the products butane (c4h10) + oxygen —>