Gold has a molar (atomic) mass of 197 g/mol. consider a 2.47 g sample of pure gold vapor. (a) calculate the number of moles of gold present

Which one of the following is not a compound? a. water b. sugar c. salt d. chocolate chip cookies which of the following is an element a. chocolate chip cookies b. sugar c. salt water d. oxygen

Which element, if combined with chlorine, will have the greatest attraction for the chlorine electrons?

How many moles of NH3 DOES it take to make 8.0 moles of H2O according to the reaction shown, 4NH3 + 5O2 yields 4NO + 6H2O A) 8.0 mol B) 3.5 mol C) 12.0 mol D) 5.3 mol

What is the pressure of 0.500 moles of carbon dioxide gas in a 2.5 L tank and at a temperature of 301 K? (R=0.0821 L·atm/mol·K

What is the balanced net ionic equation including phases for K2SO4 and SrI2

A banana split contains 1.12 million calories. What is the energy value in kilojoules? a. 1.12 kJ b. 4.686 x 10^3 kJ c. 4686 kJ d. 2.68 x 10^5 kJ e. 268 kJ

2 grams of a substance was dissolved in 75.0 g of water resulting in a temperature decrease from 23.1 ⁰C to 18.7 ⁰C. The specific heat of the solution is 4.18 J/g·⁰C. Calculate the amount of heat associated with the water.

Why do you think the soccer ball fell more slowly than the golf ball

Which of the following is an example of chemistry research in the main area of energy?. a. producing bioplastics. b. specific reactions between prescription drugs and chemicals in cells. c. developing rechargeable batteries. d.

A gas is sealed in a bottle at 25°C and 1.50 atm pressure. How must the storage conditions be changed to bring the gas to Standard Temperature and Pressure (STP) ? A. Increase the temperature by 25°C and decrease the pressure by 0.514 atm. B.