The chemical formula would be CaCO3
Answer:
a. 7.75 × 10²² molecules
b. 1.59 × 10²⁷ molecules
c. 6.41 × 10¹⁷ molecules
Explanation:
There are 7.11 × 10²⁴ molecules in 100.0 cm³ of a certain substance. We will use this ratio in our conversion fractions.
<em>a. What is the number of molecules in 1.09 cm³ of the substance?</em>
1.09 cm³ × (7.11 × 10²⁴ molecules/100.0 cm³) = 7.75 × 10²² molecules
<em>b. What is the number of molecules in 2.24 × 10⁴ cm³ of the substance?</em>
2.24 x 10⁴ cm³ × (7.11 × 10²⁴ molecules/100.0 cm³) = 1.59 × 10²⁷ molecules
<em>c. What number of molecules would be in 9.01 × 10⁻⁶ cm³?</em>
9.01 × 10⁻⁶ cm³ × (7.11 × 10²⁴ molecules/100.0 cm³) = 6.41 × 10¹⁷ molecules
For ever 1 mole of nitrogen you need 3 moles of hydrogen to make 2 moles of Ammonia.
We only have 10 moles of hydrogen so that is the limiting as there is more nitrogen then hydrogen in this particular case.
Therfore the ratio is 2 ammonia to 3 hydrogen [2:3]
Do 2/3which is 0.6667. This is how many moles of ammonia you get per mole of hydrogen.
Multiply that by 10 and you get 6.67 moles of Ammonia produced [3 significant figures]
Answer:
ATOMIC MASS = Protons + Neutrons
34+43 = 77
Atomic Mass is 77
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