Question

7) Magnesium hydroxide, Mg(OH)2, as "Milk of Magnesia" can be used to neutralize excess stomach acid, represented by HCl(ag) according to the chemical equation below. Mg(OH)2(s)+2HCI (ag)-MgCl2(ag)+ 2H20( When 5.00 g of HCl are combined with an excess of Mg(OH)2, what mass of MgCl2 can be produced? [Molar masses: H, 1.01 g/mol; O, 16.00 g/mol; Mg, 24.31 g/mol; Cl, 35.45 g/mol] A) 2.50 g E) 70.5 g D) 6.53 g C) 0.957 g B) 13.1 g 8) What is the mass of one mole of diatomic hydrogen, H2? A) 1.01 g B) 2.02 amu C) 2.02 g D) 1.01 amu E) 6.022x 1023 g 9) Incomplete combustion occurs when there is insufficient oxygen to react with a compound. The suffocating gas carbon monoxide is a product of incomplete combustion. How many moles of oxygen gas are required for the complete combustion of 11.0 moles of C6H14, a component of gasoline? 2C6H14(+1902()12CO2(g) + 14H2O( A) 105 mol 02 B) 209 mol O2 C) 1.16 mol O2 D) 418 mol O2 E) 28.0 mol O2 2

Answer 1

first find the moles and then calculate the mass as follows

based on the mole conversion and the following moles of o2 required

Мach t 2Hs0 маон, +2Hа Males Mess mdormess rHC 5.00g 0.136 0 36- S9/me 2 Mo Hc mol Mg c o. 17 me 1369 2- Mees oMgd 0.6685mpl AS 2 md 6.539 D IMol oH Hydrngeng 2.02 9 2 6Hyt °2 19melo gmd Csty MOu.S Ux19 2 e