I'm having a bit of trouble getting my head around the following chemistry questions. Any help is appreciated, thank you.
1. A solution is made dissolving 0.5mol of Al(NO3)3 and 0.2mol of Ca(NO3)2 in water. Assuming both electrolytes are fully dissociated, calculate the total number of moles of ions present.
2. Sealed flask A contains 0.7 mol of N2O gas and sealed flask B contains 2.0 mol of NO gas under identical conditions. Which one is true:
a) flask A has the same number of molecules as flask B
b) flask A contains less molecules than B
c) flask A contains less atoms than B
d) flask A contains more molecules than B
3. Which of the following is true about 0.5 mol of Cu(HSO4)2?
a) it contains 1.5 mol of ions
b) it contains 3.0 mol of atoms
c) it contains 2.0 mol of H atoms
d) it contains 3.0 mol of ions
4. Naturally occurring strontium has a molar mass of 87.62g/mol. This is because strontium:
a) is not a pure substance
b) contains atoms with a mass number of 87.62
c) contains atoms with different numbers of protons
d) contains atoms with different numbers of neutrons
You don't have to answer the questions exactly, you can use other examples etc. I'm just not sure about these questions.
1. A solution is made dissolving 0.5mol of Al(NO3)3 and 0.2mol of Ca(NO3)2 in water. Assuming both electrolytes are fully dissociated, calculate the total number of moles of ions present.
2. Sealed flask A contains 0.7 mol of N2O gas and sealed flask B contains 2.0 mol of NO gas under identical conditions. Which one is true:
a) flask A has the same number of molecules as flask B
b) flask A contains less molecules than B
c) flask A contains less atoms than B
d) flask A contains more molecules than B
3. Which of the following is true about 0.5 mol of Cu(HSO4)2?
a) it contains 1.5 mol of ions
b) it contains 3.0 mol of atoms
c) it contains 2.0 mol of H atoms
d) it contains 3.0 mol of ions
4. Naturally occurring strontium has a molar mass of 87.62g/mol. This is because strontium:
a) is not a pure substance
b) contains atoms with a mass number of 87.62
c) contains atoms with different numbers of protons
d) contains atoms with different numbers of neutrons
You don't have to answer the questions exactly, you can use other examples etc. I'm just not sure about these questions.