Answer:
The empirical formula of a compound is the simplest whole number ratio of each type of atom in a compound. It can be the same as the compound's molecular formula, but not always. An empirical formula can be calculated from information about the mass of each element in a compound or from the percentage composition
Explanatio internet bud
b) law of conservation of energy
Answer:
The outer shell of the new star will start to expand.
Explanation:
The new star will continue to glow for millions or even billions of years. As it glows, hydrogen is converted into helium in the core by nuclear fusion. The core starts to become unstable and it starts to contract. The outer shell of the star, which is still mostly hydrogen, starts to expand.
Explanation provided by:
StarChild: Stars - NASA
The answer is : 17.5 liters drained and replaced by 17.5 liters of 100% solution.
x = amount drained and replaced
(70-x) = remaining amount of 20% solution
<span>.20(70-x) + 1.00(x) = .40(70)
14 - .2x + 1x = 28
1x - .2x = 28 - 14
</span><span>.8x = 14
</span><span>x = 14/.8
x= 17,5 ( 17.5 liters drained and replaced by 17.5 liters of 100% solution)
</span>
Answer:
1.7L
Explanation:
Given parameters:
Volume of hydrogen gas = 1.7L
Unknown:
Volume of water produced = ?
Solution:
A synthesis reaction is a combination reaction that involves two or more substances combining together to give a product.
In the synthesis of water, hydrogen gas and oxygen gas are reacted to give water as a product according to the expression below;
2H₂ + O₂ → 2H₂O
Assuming that the reaction takes place at STP, it is easier to solve this problem.
Now, oxygen gas must be the excess reactant because it is freely available.
Find the number of moles of the known specie first,
Number of moles = 
Number of moles of H₂ = 
= 0.076moles
From the balanced reaction equation;
2 moles of H₂ produced 2 moles of H₂O
0.076 moles of H₂ will produce 0.076 moles of H₂O;
Volume of water produced = number of moles x 22.4
= 0.076 x 22.4
= 1.7L
