In a collection of coins there are twice as many nickels as dimes and less quarters than dimes find

here are 2.00 mol of Gas A in the mixture, how many moles of Gas B are present? (R = 0.0821 L • atm/(K • mol)) (b) The gas in a 250. mL piston experiences a change in pressure from 1.00 atm to 2.80 atm. What is the new volume (in mL) assuming the moles of gas and temperature are held constant? (c) Small quantities of Oxygen can be produced by the decomposition of mercury(II) oxide as shown below. Typically, the oxygen gas is bubbled through water for collection and becomes saturated with water vapor. Atomic weight of HgO = 216.6 amu, Atomic weight of Oxygen = 32.00 amu) 2 HgO(s) → 2 Hg(ℓ) + O₂(g) (i) Assuming that 3.05 grams of HgO was used in this reaction, determine the number of moles of oxygen gas formed.(According to the above chemical equation) (ii) Assuming 310. 0 mL of Oxygen gas was collected at at 29°C, calculate the pressure of the Oxygen gas that was collected. (R = 0.0821 L • atm/(K • mol) (iii) If the vapor pressure of water at this temperature equals to 0.042 atm, calculate the pressure reading of this experiment.

be represented with the following class. public class Item { private String description; private String itemID; private double price; public String getDescription() { return description; } public String getID() { return itemID; } public String getPrice() { return price; } /** Raises price by specified amount. */ public void raisePrice(double amount) { price += amount; } // Constructors and some methods are not shown. } A store manipulates a collection of items. The information for a store is contained in the Store class shown below. public class Store { /** The list of items */ private ArrayList allItems; /** Raises the price of all items by the specified amount. */ public void raiseAllPrices(double amt) { /* to be implemented in part (a) */ } /** Removes all items with the specified description. */ public void removeAll(String descr) { /* to be implemented in part (b) */ } // Constructors, methods, and variables not shown. } Part (a) Write the Store method raiseAllPrices. This method should change the price of each Item to be its current price plus the amount specified in the parameter. Complete method raiseAllPrices below. /** Raises the price of all items by the specified amount. */ public void raiseAllPrices(double amt) Part (b) Write the Store method removeAll. Method removeAll removes from the allItems list all items with the description specified in the parameter. For example, a call to removeAll("screwdriver") would remove all the screwdriver items from the list. Note that there could be many screwdriver items in the list, with the same description but different prices and item IDs. Complete method removeAll below. /** Removes all items with the specified description. */ public void removeAll(String descr)

ent. Thanks Phone directory App: Code should be SOLID compliant. Standard conventions to be maintained. -Read contact -Add Contact -Delete Contact -Update Contact -Search Contact (by firstname, last name, zipcode, city, phone number) -Contacts to be serialized in Json or xml -Exceptions to be handled and logged using Nlog -Unit Testing to be done using xUnit or MSTest -Store contacts in generic Collection