Question

chemistry i
mass-mole-molecules conversion handout
name
date
convert each of the following from grams to moles:

1. 15.0 g c₂h₆
2. 140.0 g naoh

convert each of the following from grams to molecules:

1. 27.2 g h₂o
2. 45.7 g caco₃

convert moles to grams in each of the following:

1. 1.5 moles nh₃
2. 0.65 moles h₂so₄

convert the following to moles:

1. 3.01×10²³ atoms na
2. 2.41×10²⁴ molecules co₂

convert the following to grams:

1. 5.01×10²⁷ atoms naoh
2. 6.91×10²⁴ molecules nh₄oh

Explanation:

Step1: Calculate molar mass

• For \(NH_3\): \(M = 14 + 3\times1=17\space g/mol\)
• For \(H_2SO_4\): \(M = 2\times1+32 + 4\times16=98\space g/mol\)

Step2: Convert moles to grams

• For \(NH_3\): \(m = n\times M=1.5\times17 = 25.5\space g\)
• For \(H_2SO_4\): \(m = n\times M=0.65\times98 = 63.7\space g\)

Answer:

1. \(25.5\space g\)
2. \(63.7\space g\)