How many moles of oxygen are in 2.0 moles of barium perchlorate, Ba(ClO4)2?

A sample of pure copper contains 2.89 x 1023 atoms of copper. What is the mass (in g) of this sample of copper?

Calculate the percentage by mass (in %) of platinum in cisplatin, PtCl2(NH3)2.

Consider the reaction of Zn, Zn, with hydrochloric acid, HCl: Zn (s) + 2 HCl (aq) → ZnCl2 (aq) + H2 (g) What is the percent yield of ZnCl2 when 19.2 g of Zn reacts with an excess of HCl to produce 28.2 grams of ZnCl2?

Simplify the expression.-(9v – 6) + 8(9v + 8)

Write equations of the horizontal and the vertical lines that pass through the given point.(7, 5)

Write the solution set using interval notation.(4x – 12) ≥ x – 3

Write the decimal as a fraction or mixed number in simplest form.0.76

Solve the problem.Suppose the sales of a particular brand of appliance satisfy the linear model , where y represents the number of sales in year x, with corresponding to 1982. Find the number of sales in

Solve the problem.A television offer advertised a set of knives for $15 down and $5 a month for 9 months. What is the total cost of the knives?