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mixer [17]
3 years ago
11

What happens to the number of valence electrons when a metal element forms a compound?

Chemistry
1 answer:
ioda3 years ago
3 0

Answer: metals loss their valence electron during bonding to form a compound

Explanation:

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How many moles does the mass quantity 130g of H2O have?
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lisabon 2012 [21]

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Tare the balance. Put calorimeter (no lid) on the balance.
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3 years ago
What mass of hydrogen will be produced by the reaction of 67.3 g of tin with excess water according to the following reaction?
Crank

Answer:

Mass of hydrogen produced =2.28 g

Explanation:

Given data:

Mass of tin = 67.3 g

Mass of hydrogen produced = ?

Solution:

Chemical equation:

Sn + 2H₂O    → SnO₂+ 2H₂

Number of moles of Sn:

Number of moles = mass/ molar mass

Number of moles = 67.3 g/ 118.71 g/mol

Number of moles = 0.57 mol

Now we will compare the moles of tin with hydrogen from balance chemical equation.

                             Sn             :               H₂

                              1               :                2

                          0.57             :               2×0.57 = 1.14

Mass of hydrogen:

Mass = number of moles ×molar mass

Mass = 1.14 mol × 2 g/mol

Mass = 2.28 g

6 0
3 years ago
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