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Alexxx [7]
3 years ago
12

Consider three elements A B and C all of which have atomic numbers of less then 20. The atomic number of A is x, and the atomic

number of B is three less than the atomic number of A
Element A forms cations with formula A+ and reacts with element C to form a solid substance with the formula AC

What is element A
Which group does element C belong to
Chemistry
1 answer:
Aleksandr-060686 [28]3 years ago
6 0

Answer:

LiH

A is lithium

group 1 or 7

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How many moles do you have in 37.3 g of Co(CrO4)3​
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Answer:

0.0917 mol Co(CrO₄)₃

General Formulas and Concepts:

<u>Chemistry - Atomic Structure</u>

  • Reading a Periodic Table
  • Using Dimensional Analysis

Explanation:

<u>Step 1: Define</u>

37.3 g Co(CrO₄)₃

<u>Step 2: Identify Conversions</u>

Molar Mass of Co - 58.93 g/mol

Molar Mass of Cr - 52.00 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of Co(CrO₄)₃ - 58.93 + 3(52.00) + 12(16.00) = 406.93 g/mol

<u>Step 3: Convert</u>

<u />37.3 \ g \ Co(CrO_4)_3(\frac{1 \ mol \ Co(CrO_4)_3}{406.93 \ g \ Co(CrO_4)_3} ) = 0.091662 mol Co(CrO₄)₃

<u>Step 4: Check</u>

<em>We are given 3 sig figs. Follow sig fig rules and round.</em>

0.091662 mol Co(CrO₄)₃ ≈ 0.0917 mol Co(CrO₄)₃

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