Question

Calculate the mass of 0.5 mole of water (H2O)and 0.5mole

of ammonia(NH3). Which has larger mass? explain step by step​

Answer 1

Explanation:

☆Formula:

$\boxed{\bf{\red{ moles = \dfrac{mass}{molar\; mass}}}}$

☆Solution:

》$\bf{ H_{2}O}$

▪︎molar mass(M) = (2×1)+(8)

= 10u

▪︎mole(n) = 0.5

》$\ n= \dfrac{m}{M}$

》$\ 0.5= \dfrac{m}{10}$

▪︎mass = 5grams

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》$\bf{ NH_{3}}$

▪︎M= 14 + 1×(3)

= 17u

▪︎mole = 0.5

》$\ n= \dfrac{m}{M}$

》$\ 0.5= \dfrac{m}{17}$

▪︎mass = 8.5 grams.

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☆☆above you see ammonia(8.5)has greater mass than water (5).

♧hope it helps!♧

Answer 2

Answer:

n=m/M

n=N/No

n=no. of moles

m=given mass

M=molar mass

N=no. of particles

No=Avogadro's no.=6.022×10²³

•n=m/M

0.5=m/M

M of H2O= 2(1)+1(16)

=2+16

=18 u

0.5=m/18

0.5×18=m

9 u=m

•n=m/M

0.5=m/M

M of NH3= 1(14)+3(1)

=14+3

=17

n=m/M

0.5=m/17

0.5×17=m

8.5 u= m

•H2O has larger mass