Question

What is the mass, in grams, of each elemental sample? a. 2.3 * 10-3 molSb b. 0.0355 mol Ba c. 43.9 mol Xe d. 1.3 mol W

Answer 1

Answer:

a. Sb =0.280048 g ,  b. Ba=4.875215 g ,  c.  Xe=5763.631 g ,    d. W=238.992 g

Explanation:

number of moles = $\frac{mass}{molar mass}$

(a) For Sb, molar mass =121.76g/mol

number of moles =2.3*$10^{-3}$mol

mass= number of moles * molar mass

mass =2.3*$10^{-3}$ *121.76

mass =0.280048 g

(b) for Ba, molar mass=137.33 g/mol

number of moles =0.0355 mol

mass = 0.0355 *137.33

mas = 4.875215 g

(c) for Xe, molar mass = 131.29 g/mol

number of moles =43.9 mol

mass =43.9 *131.29

mass =5763.631 g

(d) for W, molar mass = 183.84 g/mol

number of moles = 1.3mol

mass = 1.3 *183.84

mass = 238.992 g