Answer:
5.58*10⁻³ moles of gas are in the sample.
Explanation:
The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Being 1000 mL equivalent to 1 L, then 125 mL is equal to 0.125 L. Then you can apply the following rule of three: if by STP conditions 22.4 L are occupied by 1 mole, 0.125 L are occupied by how many moles?
aomunt of moles= 5.58*10⁻³ moles
<u><em>5.58*10⁻³ moles of gas are in the sample.</em></u>
Answer:
a) Secretion of unpleasant liquids which make them distasteful.
Possession of spines or thorns or irritating hairs which cause pain or irritation on contact.
Possession of poisonous parts which cause pain or itching or death or swelling on contact.
b) An anion is a negatively charged atom (or group of atoms).
OR
An anion is an ion formed when an atom (or group of atoms) gain electrons.
c) i. NH4OH and dilute HCL.
= Ammonium chloride, water
ii. CACO3 and dilute HCL.
= Calcium chloride, water, carbon dioxide or carbon (IV) oxide.
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Strontium has four stable, naturally occurring isotopes: 84-Sr (0.56%), 86-Sr (9.86%), 87-Sr (7.0%) and 88-Sr (82.58%). 87.62 is standard atomic mass of strontium.
Answer: D, splitting water into hydrogen and oxygen is a chemical change.
