Answer:
oxidation numbers
Explanation:
chemical equation tells the story of a chemical reaction. Reactants are the starting substances in the reaction while products are the new substances that are formed. The large numbers in front of some of the formulae are called coefficients. These coefficients are used to balance the equation. Chemical reactions must obey the Law of Conservation of Matter. The number of atoms of each element on both sides of the equation must be equal because matter cannot be created or destroyed
17. Calculate the mass of hydrogen formed when 24 g of aluminum reacts with excess hydrochloric acid
according to the balanced equation below.***
2A1 + 6HCI - 2 AlCl3 + 3 H2
a. 1.5 g
b.2.7 g
c. 3.4g
d. 6.6 g
Answer:
c) 2.7 g
Explanation:
The first step is to find the moles of aluminum that you're reacting. To do this, you would do
24 g × molar mass of aluminum = 24 g ÷ 26.982 g/mol = 0.8895 mol Al
Then by the balanced equation, you know that every 2 moles of Al will produce 3 moles of H2. This implies that 0.8895 × (3/2) = 1.334 moles of H2 will be produced
Lastly to find the mass of H2 produced, multiply the moles of H2 produced by the molar mass of H2
1.334 mol × (2 × 1.008 g/mol) = 2.69 g ≈ 2.7 g
How many moles of sodium (Na) are there in a
sample of 5.87 x 1024 atoms of sodium?
There are 9.8 moles of sodium (Na) in a sample of 5.87 x 10²⁴ atoms of sodium.
HOW TO CALCULATE NUMBER OF MOLES?The number of moles of a substance can be calculated by dividing the number of molecules in the substance by Avogadro's number. That is;
no. of moles = no. of atoms ÷ 6.02 × 10²³
According to this question, there are 5.87 x 10²⁴ atoms of sodium. The number of moles is as follows:
no. of moles = 5.87 x 10²⁴ atoms ÷ 6.02 × 10²³
no. of moles = 0.98 × 10¹
no. of moles = 9.8moles
Therefore, there are 9.8 moles of sodium (Na) in a sample of 5.87 x 10²⁴ atoms of sodium.
Learn more about no. of moles at: https://brainly.com/question/14919968
how many electrons are in the outermost shell of oxygen
Answer:
6
Explanation:
electronic configuration is 2,6.
From electronic configuration we can see that oxygen have 6 electrons in its outermost shell.
do all species take care of their offspring in the same way?
Answer:
No
Explanation:
not every species take care of their offspring/babies some abandon their babies and leave and some take care of them till they are older
1)
If I have 9 moles of a gas at a pressure of 1 atm and a volume of 12 liters, what is
the temperature?
ideal gas
PV=nRT
T = PV/nR
T = 1 x 12/9 x 0.08205
T = 16.25 K
