3 years ago

How many moles are in 15 grams of calcium

2 answers:

5 0

Atomic mass Ca = 40.0 u.m.a

1 mole Ca ------------- 40.0
? moles Ca ---------- 15 g

15 x 1 / 40 = 0.375 moles of Ca

3 0

Approximately 0.374 moles

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serious [3.7K]

It doesn't no solution

4 0

3 years ago

Assoli18 [71]

[ H₃O⁺] = 10 ^ - pH

[ H₃O⁺ ] = 10 ^ - 7.30

[ H₃O⁺ ] = 5.011 x 10⁻⁸ M

hope this helps!

6 0

2 years ago

e-lub [12.9K]

Yes i think so

hope i helped

8 0

2 years ago

Bond [772]

The correct answer is c, it’s evaporating there for it’s a chemical change

8 0

2 years ago

lys-0071 [83]

Mass of ammonia produced : 121.38 g

<h3>Further explanation</h3>

Given

Reaction

3H₂(g) + N₂(g) ⇒ 2NH₃(g)

100g of N₂

Required

Ammonia produced

Solution

mol of N₂ :

$\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{100}{28}\\\\mol=3.57$

From the equation, mol ratio of N₂ and NH₃ = 1 : 2, so mol NH₃ :

$\tt \dfrac{2}{1}\times 3.57=7.14~moles$

mass of NH₃(MW=17 g/mol) :

$\tt mass=mol\times MW\\\\mass=7.14\times 17\\\\mass=121.38~g$

8 0

2 years ago