Which of the following is the correctly balanced chemical equation for the reaction of Ca(OH)2 and HNO3?
Ca(OH)2 + HNO, → Ca++NO;
Ca(OH)2 + 2HNO, → 2H2O+2NO-
Ca(OH)2 + 2HNO, →H, O+CaNO,
Ca(OH)2 + 2HNO, → 2H2O+ Ca(NO3)2

Ca(OH)2 + 2HNO3, → 2H2O+ Ca(NO3)2

Explanation:

The last option is correctly balanced

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles