General Chemistry Answers

An environmental chemist needs a carbonate buffer

of pH 10.00 to study the effects of acid rain on

limestone-rich soils. How many grams of Na2CO3

must she add to 1.5 L of freshly prepared 0.20 M

NaHCO3

to make the buffer? pKa of HCO3–

is 10.

A 2.30g sample of white solid was vaporized in a 345mL vessel.If the vapor has a pressure of 985 mmHg at 148°C , what is the molecular mass of the solid

What is the molarity of H₃PO₄ solution if 358 mL is completely titrated by 876 mL of 0.0102 M Ba(OH)₂ solution?

how many moles are in 1.0 g of hydrogen

Mark is measuring the specific heat of a new type of coolant he first warms 75.0 g of this coolant from 23.5*C to 45.0*C then he puts the warm coolant into a calorimeter and cools it back to 23.5 *C the calorimeter calculations show the sample coolant shed 1370 calories of energy. What is the specific heat of the coolant?

Copper has a specific heat of approximately 0.40 J/g *C 1000J of energy is required to heat a sample of copper from 15*C to 40*C what is the mass of the sample of copper?

Mariah wants to determine how much energy is needed to change 500g of liquid water at 100*C to steam at 100*C. What information will best help her make this calculation?

How many g of Co(NO2)2 • 5 H2O are needed to make 432 mL of a 1.2 M solution?

What is the volume of 2.7 mol of gas at 2.3 atm and a temperature of 35 ℃?

how many atoms of FE are needed to react with 50 grams of AgNO3