How many moles of iridium are in 26.4 g of iridium?

a. 1 mol

b. 1.37 10-1 mol

c. 5.06 103 mol

d. 7.29 mol

On the periodic table, why is Osmium most dense?

Balance the following Equation: ___Zn + ___HCl - -> ___ZnCl2 + ___H2 50g of zinc are reacted with 50g of hydrogen chloride. Calculate the amount of excess reactant. A - 4.2g B - 5.1g C - 1.4g D - 2.3g

What volume of 1.50M NaCl contains 3.40 moles of NaCl? a) 2.27 L b) 5.10 L c) 882 mL d) 441 mL

A person driving a car applies the brakes. This produces friction, which stops the car. Into which type of energy is the mechanical energy of the car converted? A. heat B. gravitational C. light D. chemical

What are did facts about atomic number 20?

If element A has an ionic charge of + 2 and element B has an ionic charge of - 3, what will be the formula for the compound created by element A and element B? A2B3 A3B2 AB2 impossible to determine without additional information

The equation below shows the reaction of zinc with hydrochloric acid (HCl). Zn (s) + 2 HCl (aq) - > ZnCl2 (aq) + H2 (g) What will happen if the concentration of HCl is decreased? A. More ZnCl2 will be produced. B. The reaction rate will slow down. C.

Which substance is most likely to heat up the fastest?

According to Table I, which salt releases energy as it dissolves? (1) KNO3 (3) NH4NO3 (2) LiBr (4) NaCl

Which subshell is likely to be filled after the rest of the subshells at a particular energy level?