Ka for ammonium ion (NH4 1 ) is 5.7 X 10210. Find Kb for ammonia (NH3).

Q: What is the mass percentage of C in CH3CH₂OH? Provide an answer to two decimal places.

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Q: Consider 100.0 g samples of two different compounds consisting only of chromium and oxygen. One…

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Q: 1/5 Emmanuella Read each description in the first column of the table below. If any chemical element…

A: The question is based on periodic properties. we need to identify the correct element in each case.

Q: Specify the number of protons and electrons in each of the following ions. A) Se^2−, needed for…

A: To specify the number of protons and electrons we will use the following concept . Since we know…

Q: What is the atomic weight for the element that is in group IIA(2) and period 2? (Enter your answer…

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Q: A robot spacecraft returned samples from the planetesimal 98765 ALEKS, located in the outer Solar…

A: Given thatIsotopeMass (amu)Relative Abundance96Ru95.9192.6%100Ru99.907.4%we have to calculate the…

Q: What is the name of the compound with the formula NO₂? What is the name of the compound with the…

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Q: Iron exists in nature as a mixture of predominantly three isotopes: ⁵⁴₂₆Fe (53.94 amu), ⁵⁶₂₆Fe…

A: We have to calculate the percentage of rarest of three isotopes.

Q: olo There are only two naturally-occuring stable isotopes of boron, the masses of which are listed…

A: We will calculate the natural or relative abundance of Boron isotopes. we will apply simple mole…

Q: Find the number of hydrogen and oxygen atoms present in 15.0 g of pure hydrogen peroxide

A: we have to calculate  the number of hydrogen and oxygen atoms present in 15.0 g of pure hydrogen…

Q: Let's look at an example: which of the following compounds has 9 hydrogens (H)?   Options:…

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Q: A metal (M) forms an oxide with the formula M2 O. Part A If the oxide contains 53.54 % O by mass,…

A: A metal forms an oxide with the formula M2O. If the oxide contains 53.54% O by mass. The identity of…

Q: Ka for formic acid (HCO2H) is 1.8 × 10^-4 . What is Kb for the formate ion (HCO2−)?

A: Answer: HCOOH (formic acid) is the weak organic acid and HCOO- (formate ion) is its conjugate base.

Q: bottle. The bottle contains 3.78 L of ethanol. The bottle contains 2 What is the density of ethanol…

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Q: 6. Europium (Eu) has two stable isotopes, 151 Eu and 153 Eu, the masses of which are 150.920 u and…

A: The objective of the question is to determine the percent natural abundance for the heavier…

Q: On another planet, the isotopes of titanium have the given natural abundances. Isotope 46TI…

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Q: Yzed 3.725 g of an unknown mixture of NaCl, SiO2, and CaCO3. You isolated 1.108 g NaCl, 0.848 g…

A: Given information- total mass of mixture = 3.725 g  mass of NaCl = 1.108 g  mass of SiO2   = 0.848 g…

Q: On another planet, the isotopes of titanium have the given natural abundances. Abundance Mass (u)…

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Q: Antimony (Sb), has two naturally occurring isotopes: Sb-121 that has a percent abundance of 57.30 %…

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Q: What is the mass to charge ratio of a propane ion (C3H3*) if one of the carbon atoms is a 13C and…

A: The mass to charge ratio of the propane ion (C3H8+) can be calculated by taking the sum of the mass…

Q: When we see a compound that has parentheses, we treat them the same way we would in algebra. If we…

A: The compound given are, 1) (NH4)2HPO4  2) C4H8BeF3NO4  3) C6H12O6  4) CH6NO3P

Q: The gemstone sapphire (see image) is mostly a compound of aluminum and oxygen that contains aluminum…

A: The gemstone sapphire is the mineral corundum. It contains aluminium cation and oxygen anion.…

Q: Five calcite, CaCO3 (MM 100.085 g/mol), samples of equal mass have a total mass of 11.2 + 0.1 g.…

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Q: I need  answer step by step

A: Step 1:, Step 2: Step 3: Step 4:

Q: The element lanthanum has an atomic weight of 139 and consists of two stable isotopes lanthanum-138…

A: The objective of the question is to find the mass of the isotope lanthanum-139. The atomic weight of…

Q: There are protons, neutrons, and electrons in 147₁ Hs+5

A: Atom is composed of three subatomic particles, which are electrons, protons and neutrons.  Protons :…

Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.