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Answer:
A) in response to an increase in the cytoplasmic Ca2+concentration.
Explanation:
Muscle contraction occurs in response to an increase in the cytoplasmic Ca2 + concentration.
This process occurs with the shortening of the sarcomeres resulting in a result, the actin filaments react with myosin, generating actomyosin. During this reaction, it is necessary to increase the cytoplasmic concentration of Ca + and ATP. In this, myosin will break down ATP, releasing energy so that the muscle can contract.
Answer:- 4.35 kg of ammonium perchlorate are required for every kg of Al.
Solution:- It's a stoichiometry problem. The balanced equation for this problem is....

From balanced equation, there is 3:3 that is 1:1 mol ratio between aluminum and ammonium perchlorate.
Given mass of Al is 1 kg and we are asked to calculate the mass of ammonium perchlorate for it.
Molar mass of Al is 26.98 g/mol and molar mass of ammonium perchlorate is 117.49 g/mol.
1 kg = 1000 g
Grams of Al are converted to moles and then moles of ammonium perchlorate are calculated using mol ratio and finally on multiplying with molar mass we get the mass of ammonium perchlorate.
1000 g Al x (1mol Al/26.98 g Al) (1mol ammonium perchlorate/1mol Al) (117.49 g ammonium perchlorate/1mol ammonium perchlorate)
= 4354.7 g that is 4.35 kg of ammonium perchlorate