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3 years ago

For the following chemical equation.

Chemistry

1 answer:

kotegsom [21]3 years ago

5 0

Sr is the limiting reactant.

Given the reaction equation;

2Sr + O2 (g) → 2SrO

2 moles of Sr reacts with 1 mole of O2

2 moles Sr will react with x mole of O2

x = 2 ×1/2

x = 1 mole of O2

Since we have more O2 than required, it is the reactant in excess, hence Sr is the limiting reactant.

Learn more: brainly.com/question/14225536

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A student lives in a place that receives lots of snow and ice during the winter. The student has observed that the highway depar

trapecia [35]

Answer:

Salt lowers the freezing point of water, which makes the melted snow on the road less likely to form ice.

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3 years ago

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The isotope 90_Sr has a half-life of 28.8 years. What is the activity, measured in atoms/second of a 50 mg sample of "Sr? (10 pt

blsea [12.9K]

Answer:

$2.5523\times 10^{11} atoms/seconds$ is the activity, measured in of a 50 mg sample of 90-Sr.

Explanation:

Half life of the 90-Sr , $t_{1/2}= 28.8 years$

Activity coefficient of the 90-Sr = $\lambda$

$\lambda =\frac{0.693}{28.8 years}=0.0240625 year^{-1}$

Mass of 90-Sr = 50 mg = 0.050 g

Molecular mass of 90-Sr = 90 g/mol

Moles of 90-Sr = $\frac{0.050 g}{90 g/mol}=0.0005555 mol$

Number of atom in 0.0005555 moles of 90-Sr:

$0.0005555 mol\times 6.022\times 10^{23} mol^{-1}=3.3455\times 10^{20} atoms$

$\lambda =0.0240625 year^{-1}=\frac{0.0240625}{3.154\times 10^7 s}=7.6292\times 10^{-10} s^{-1}$

1 year = $3.154\times 10^7 seconds$

Activity measured in atoms per seconds:

= Number of atoms × $\lambda$

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$=2.5523\times 10^{11} atoms/s$

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3 years ago

2.00 L of a gas is collected at 25.0°C and 745.0 mmHg. What is the volume at 760.0 mmHg

Leviafan [203]

1.7960L

Explanation:

the mass of the gas is constant in both instances

pv/T=constant(according to pv=nRT)

745mmHg*2L/298K=760mmHg*v/273K

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3 years ago

Please Help I need an explanation on how to do this

nydimaria [60]

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Remember that it's a ionic equation not general equation

We have to balance it accordingly

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2 years ago

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Advantages of fossil fuels

gayaneshka [121]

Answer:

advantages of fossil fuels are:

1. they can generate a large amount of electricity at a single location.

2. they can be found very easily.

3. they are cost-effective.

hope this helps you:)

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3 years ago