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STatiana [176]
3 years ago
11

A gas at 1.2 atm has a

Chemistry
1 answer:
Papessa [141]3 years ago
8 0

Answer:

1.26 mole

Explanation:

Using ideal gas law

PV=nRT

R= 0.08206

T=273+87=360

1.2×31=n×0.08206×360

37.2 =n × 29.54

n= 1.26 mole

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Naturally occurring zirconium exists are five isotopes. axe with a mass of 89.905 u(51.45%); Zr with a mass of 90.906 u (11.22%)
Anton [14]
Isotope 1: 89.905 * 51.45 = 4625.61225 / 100 = 46.2561225
Isotope 2: 90.906 * 11.22 = 1019.96532 / 100 = 10.1996532
Isotope 3: 91.905 * 17.15 = 1576.17175 / 100 = 15.7617075
Isotope 4: 93.906 * 17.38 = 1632.08628 / 100 = 16.3208628
Isotope 5: 95.908 * 2.08 = 268.5424 / 100 = 2.685424

46.2561225 + 10.1996532 +  15.7617075 + 16.3208628 + 2.685424 = 91.22377
actual mass Zr = about 91.22
8 0
3 years ago
Which statement about atoms is correct
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Answer:Protons are positively charged is the correct statement about an atom

I've also corrected the other statements

Atoms contain protons and neutrons in their nucleus

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6 0
3 years ago
What is a kind of biochemical that does not dissolve in water and makes up cell walls fats oils and waxes?
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Lipids is a kind of biochemical that does not dissolve in water and makes up the cell walls fats oil and waxes
5 0
3 years ago
How does the law of conservation of matter apply to chemical equations?
Tasya [4]

Answer: option D.

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3 0
3 years ago
An unknown metal has a mass of 86.8 g. When 5040 J of heat are added to the sample, the sample temperature changes by 64.7 ∘ C .
grandymaker [24]

Answer: The specific heat of the unknown metal is 0.897J/g^0C

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

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m= mass of substance = 86.8 g

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Change in temperature ,\Delta T=T_f-T_i=(64.7)^0C

Putting in the values, we get:

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The specific heat of the unknown metal is 0.897J/g^0C

4 0
3 years ago
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