How many Ca2+ ions are in a sample of CaSO4 having a total mass of 68.07 g? (Given: The molar mass of CaSO4 is 136. 14 g/mol; Avogadro's number is 6.022 x
1023 /mol)
O 6.022 x 1023 Ca2+
ions
3.011 x 1023 Ca2+ ions
3.011 x 1022 Ca2+ ions
4.516 x 1023 Ca2+ ions
O 1.024 x 1024
Ca2+
ions

There are  

17.01

Explanation:

The chemical formula for calcium phosphate is  

Ca

3

(PO

4

)

2

. This means that in one mole of calcium phosphate, there are three calcium ions and two phosphate ions.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.