please help with all three questions.

please use the corrext significant number

Aqueous hydrochloric acid (HCl) wal react with solid sodium hydroxide (NaOH) to produce aqueous sodium chloride (NaCl) and liquid water (H2O). Suppose 29.5g of hydrochloric acid is mixed with 12. 9 of sodium hydroxide. Caiculate the maximum mass of sodium chloride that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits. Gaseous butane (CH3(CH2)2CH3) reacts with gaseous oxygen gas (O2) to produce gaseous carbon diaxide (CO2) and gaseous water ( H2O). What is the theoretical yield of water formed from the reaction of 4.07g of butane and 23.6g of arygen gas? Be sure your answer has the correct number of significant digits in it. Gasequs methane (CH4) reacts with gaseous axygen gas (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O). If 3.35 g of water is produced from the reaction of 10.3 g of methane and 22.9g of oxvgen gas, calculate the percent yield of water. Be sure your answer has the correct number of significant digits in it