1. how many atoms are there in 1.7 mol ca?

There are atoms in 1.7 mol Ca

Solution:

Initially we have to convert the given mass of calcium to moles of calcium, using its molar mass (referring to a periodic table, this is 40.08  g/mol

Using Avogadro's number, as

We can calculate the number of atoms present by

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.

gas

explanation:

smoke is the matter of a gas