What mass of copper (d = 8.92 g/cm^2) occupies the same volume as 80.0g of silve

Question

What mass of copper (d = 8.92 g/cm^2) occupies the same volume as 80.0g of silver (d = 10.50 g/cm^3) (A) 7.62g (B) 8.97g (C) 94.2g (D) 68.0g Which aqueous solution would neutralize a spill of HNO_3? (A) vinegar, HC_2H_3O_2 (B) sodium chloride, NaCl (C) sucrose, C_12H_22O_11 (D) sodium bicarbonate, NaHCO_13 What is the net ionic equation for the reaction of aqueous solutions of K_3PO_4 and Cu(NO_3)_2? (A) 2 PO_4^3+ (aq) + 3 Cu^2+ (aq) rightarrow Cu_3 (PO_4) (s) (B) 2 K_2 PO_4 (aq) + 3 Cu (NO_3)_2 (aq) rightarrow Cu_3(PO_4)_2 (s) + 6 KNO_3 (aq) (C) K^+ (aq) + PO^3-_4 (aq) + Cu^2+ (aq) + NO^-_3 (aq) rightarrow Cu_3 (PO_4)_2 (s) + K^+ (aq) + NO^-_3 (aq) (D) 6K^+ (aq) + 2 PO^3-_4 (aq) + 3 Cu^2+ (aq) + 6 NO^-_3 (aq) rightarrow Cu_3 (PO_4)_2 (s) + 6K^+(aq) + 6 NO^-_3 (aq) What is the oxidation number of nitrogen in N_2H_5^+? (A) -3 (B) -2 (C) +1 (D) +2 Which is a precipitation reaction? (A) Zn (s) + H_2 SO_4 (aq rightarrow ZnSO_4 (aq) + H_2 (g) (B) HNO_3 (aq) + KOH (aq) rightarrow KNO_3 (aq) + H_2 O (l) (C) K_2 CrO_4 (aq) + Pb(NO_3)_2 (aq) rightarrow PbCrO_4 (s) + 2 KNO_3 (aq) (D) CaCO_3(s) + 2 HCI (aq) rightarrow CaCl_2 (aq) + CO_2 (g) + H_2 O(l) What is the formula for the compound formed with chromium (III) and carbonate? (A) CrCO_3 (B) Cr_3 (CO_3)_2 (C) Cr_2 (CO_3)_3 (D) Cr (CO_3)_3 Which is the least soluble in water? (A) KCI (B) HgCl_2 (C) MgCl_2 (D) FeCl_3

Explanation / Answer

Ans 9 D) 68.0 g

Density = mass / volume

Volume = mass / density

M copper / 8.92 = 80.0 / 10.50

M copper = (80.0 / 10.50) × 8.92

M copper = 68.0 g

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