An unknown substance has a mass of 1.37 g. The temperature of the substance increases from 27.1oC to 42.7oC when 89.1 J of heat is added to the substance. Substance Specific Heat (J/g·°C) Lead 0.130 Silver 0.240 Copper 0.385 Iron 0.442 Aluminum 0.892 Water 4.184   a) What is the specific heat of the unknown substance ? J/goC b) Based on the substances shown on the table above, what is the most likely identity of the unknown substance ?

An antacid tablet contains NaHCO3. What mass of this compound is required to neutralize 125 mL of 2.75 M HCl? NaHCO3(aq) + HCl(aq) → NaCl(aq) + CO2(g) + H2O(l)

An unknown substance has a mass of 23.8 g. The temperature of the substance increases from 27.1oC to 42.7oC when 89.1 J of heat is added to the substance. Substance Specific Heat (J/g·°C) Lead 0.130 Silver 0.240 Copper 0.385 Iron 0.442 Aluminum 0.892 Water 4.184   a) What is the specific heat of the unknown substance ? J/goC b) Based on the substances shown on the table above, what is the most likely identity of the unknown substance ?

How many milliliters of 11.0 M HCl(aq) are needed to prepare 0.875 L of 1.00 M HCl(aq) ?

If 4.99 g of CuSO4 (molar mass 159.61 g/mol) is dissolved in water to make a 0.250 M solution of CuSO4, what is the volume of the solution in milliliters ? Show all your work for full credit. Use the correct number of significant figures.

Consider the reaction: 4HCl(aq) + MnO2(s) → MnCl2(aq) + 2H2O(l) + Cl2(g) A sample of 39.1 g MnO2 (molar mass = 86.94 g/mol) is added to a solution containing 49.3 g HCl (molar mass = 36.46 g/mol). a) How many moles of Cl2 can be obtained from MnO2? b) How many moles of Cl2 can be obtained from HCl? c) How many moles of Cl2 can be obtained in this reaction? d) How many grams of Cl2 (molar mass = 70.91 g/mol) can be obtained in this reaction? e) What is the limiting reactant? f) If the yield of the reaction is 77.1%, what is the actual yield of Cl2? Show all your work for full credit. Use the correct number of significant figures.

An antacid tablet contains NaHCO3. What mass of this compound is required to neutralize 175 mL of 2.75 M HCl? NaHCO3(aq) + HCl(aq) → NaCl(aq) + CO2(g) + H2O(l)

Calculate the molar mass of a gas if 0.475 g of this gas occupies 0.250 L at 0.955 atm and 297 K. Show all your work for full credit. Use the correct number of significant figures.

Calculate the molar mass of a gas if 0.183 g of this gas occupies 0.280 L at 0.930 atm and 295 K. Show all your work for full credit. Use the correct number of significant figures.

A sample of 0.125 mol of NO2 occupies a volume of 2.15 L. What will the volume be if the number of moles of NO2 is increased to 0.725 mol, with no change in temperature or pressure ?